Chassis

Steering

The recommendation stands. Bolt in a Borgeson 800132 12.7:1 box at the stock location. It costs $467.78 at Dale's and $493.76 at AZPro, fits 1968-86, and has a 3/4-30 input. Pair it with a BBC-bracketed pump with remote reservoir ($305.41 at POL) and new braided hoses ($162.20). The Borgeson 000933 shaft…

Prices checked 2026-10-12 from retailer pages or search-result snippets (Summit/JEGS block page fetches; CJ Pony Parts, Detroit Speed and Classic Industries returned 403 to fetches, so those prices come from search snippets and are marked "snippet"). Anything not confirmed is labelled.

The pick

Good
About $450-$750: a rebuilt stock-ratio box (FridayParts CP50014, $192.27) or a Classic Performance quick-ratio box (~$297, quality unconfirmed), plus rag joint, arms and rubber hoses. It does not fix the slow ratio.
Better
About $1,300-$1,800: Borgeson 800132 ($468-$494), pump with remote reservoir for big block ($305), bracket ($59-$78), braided hoses ($162), filter ($38), arms ($95), and optionally the Borgeson 000933 shaft (~$260-$328). A column rebuild is extra, and an ididit tilt column adds $1,461.
Best
About $2,400-$4,500: PSC SGX041-12S ($1,695) or a Unisteer rack and pinion kit ($2,374.60), plus an ididit or Flaming River tilt column ($1,056-$1,461). Hydroboost adds $732-$860 plus hoses ($343-$401).

Primary pick: Borgeson 800132 (12.7:1) bolted to the stock location, plus a Borgeson 000933 shaft (1977-78), new pitman and idler arms, new tie rods and sleeves, a new pump with remote reservoir on a BBC bracket, braided hoses, and an inline filter. Estimated parts about $1,300-$1,800 depending on linkage choices (box ~$468-$616, shaft ~$260-$330, pump ~$305, bracket ~$59-$78, hoses ~$86-$162, filter ~$38, arms ~$95, linkage kit/tie rods not confirmed).

Why this over the alternatives:

  • It keeps the bolt-in geometry that the 454, factory crossmember and bellhousing already accommodate. The rack-and-pinion kits are better steering but cost $1,200-$2,700 and Unisteer itself warns some headers need modification, which is a risk with a BBC.
  • 12.7:1 is the sensible choice for a 65-70 mph interstate commute. Owners report it improves highway tracking versus the stock box rather than making it twitchy; the stock ratio is the one people describe as loose. 16:1 is simply the stock number, and I did not find a widely sold 14:1 for this truck, so the practical choice is stock vs 12.7:1.
  • PSC at $1,695 is the premium option; given a decade-long project and a teen driver, I would spend that only if the owner values the build quality, since the Borgeson and Detroit Speed boxes do the same job for roughly a third of the price. Detroit Speed is the equal alternative if you buy their linkage or front end later.
  • Column: keep a column shift for the TH400 or 4L80E; the ididit column-shift tilt (1540760010, ~$1,461) is the "Better" cosmetic and ergonomic upgrade, while a rebuilt factory column is the "Good" choice. A floor shifter only makes sense if the T56 is chosen, and then use the ididit floor-shift column (1520760010, ~$1,056).
  • If the owner adds hydroboost, use the POL/Hydratech kit with the same pump and hoses. If the owner chooses vacuum power brakes with the aggressive cam, that decision goes in the brakes section and does not affect steering.

Why it matters

A '77 C10 with a 454, Turbo 400 and (eventually) big tires and a drop is the heaviest-nosed configuration this platform offers. The factory Saginaw 800 recirculating-ball box in these trucks is slow (published as roughly 16:1 to 17.5:1 depending on the source, 4+ turns lock-to-lock), has no road feel, and after ~50 years is almost always worn at the sector shaft, with a pitman arm, idler arm and rag joint that have loosened up too. The owner's leaked pump and rotten hoses are normal for the age. For a truck that will be a teenager's daily driver around 2042, and that sees 65-70 mph interstate, steering slop is a safety item, not a cosmetic one.

The good news: this is the cheapest big improvement on the whole build. A new quick-ratio box (12.7:1, about 2.5-3 turns lock-to-lock) bolts into the stock frame holes in a couple of hours and reviewers consistently say the highway feel gets tighter, not twitchier. The bad news is in the interactions: a big-block with full-length headers is the classic place where the header collector, the steering box and the frame crossmember compete for the same space, and the owner wants hydroboost-style options open (the pump must then feed the booster) plus a column that works with the Turbo 400/4L80E shifter.

Because the truck is a 1977, it sits right on the column and input-shaft break year. Several sources describe 1976-and-older trucks as having a 13/16"-36 spline steering shaft that needs an adapter, with 1977+ using 3/4"-30 spline; one vendor (PSC) splits part numbers as 1967-76, 1977-79 and 1980-87. Confirm what is physically on the truck before ordering (see Questions).

Options

Tier Brand & model Part # Price (vendor, checked 2026-10-12) Link Notes
Good Classic Performance Products "500 Series" quick-ratio box (import-sourced) not confirmed for 1973-87 ~$297 (eBay listing snippet) ebay.com Only a snippet seen; ratio and quality not confirmed. Forum reports (gmsquarebody) that auto-store rebuilt boxes arrived bound-up or leaking. Fine for a budget stopgap, not a 2042 plan.
Good (stock-feel) Plain rebuilt stock 800 (e.g., FridayParts SGB10TRK, 1975-88) CP50014 $192.27 (snippet) fridayparts.com Keeps the slow ratio. Not recommended; included for baseline.
Better Borgeson Street & Performance 12.7:1 800132 (fits 1968-86 C10, gas engines) $467.78 Dale's Superstore (fetched 2026-10-12; same as JEGS snippet, MSRP $519.75); $493.76 AZPro Performance (fetched); Walmart marketplace $615.67 was a search snippet only, page is bot-blocked and not re-verified dalessuperstore.com ; azproperformance.com New unit, 3/4"-30 spline input, 1-1/4" 32-spline pitman shaft, 3-year warranty, max 1450 psi and 2.5-3.0 GPM recommended flow (see pump gotcha), bolts to the stock 800 mounts, uses factory power-steering pitman arm, includes adapters for O-ring and inverted-flare hoses. Press reviews (Street Muscle, BangShift, In The Garage) call it a ~2-hour swap. Brass ferrules for older flare lines.
Better Detroit Speed 12.7:1 "Detroit Tuned" box 090216PDS (also listed 090216DS) $554.95 Detroit Speed (snippet); $571.95 sale / $633.63 MSRP CJ Pony (snippet) detroitspeed.com Same bolt-in idea with a tuned valve. A good choice if you also use Detroit Speed linkage or later go to a Detroit Speed front end.
Best PSC Steering 12.7:1 sport-valved gearbox SGX041-12S (1977-79), SGX042-12S (1967-76), SGX041-12M (1980-87) $1,695.00 (Dale's Superstore) dalessuperstore.com Hand built in Texas, zinc plated, 2-3/4 turns lock-to-lock, direct replacement. Note the part number split: for a 1977 the listing says SGX041-12S. Forum posters call PSC the premium option at "$500+" for older listings; the current $1,695 price is what the retailer shows.
Not confirmed Lares, Red Head, AGR not confirmed not confirmed gmsquarebody.com Forum members recommend Red Head at roughly half of PSC and Lares as reputable. I did not find current 1973-87 C10 listings or prices for either, or for AGR. Treat as candidates to price-check, not recommendations.

B. Replace the box with rack and pinion

Tier Brand & model Part # Price Link Notes
Better Performance Online (POL) rack and pinion kit listing not fully detailed $1,215.92 performanceonline.com Price only; I could not confirm the manufacturer or what's included.
Best Unisteer power rack and pinion kit 8012380-01BBL $2,374.60 (Performance Online; range $2,360-$2,724 by option) performanceonline.com Rear-steer rack on a one-piece bracket using the stock box and idler holes, 2WD only, 2-7/8 turns lock-to-lock, includes pump and -6AN hose kit and collapsible shaft. Unisteer says "some headers may require modification" and a two-groove water pump pulley is needed. Needs its own pump, which matters for hydroboost.
Best (suspension-level) Detroit Speed SpeedMAX front end (GMT800 rack) Front Speed Kit 3 is 032093DS; steering shaft 092536DS (1973-78) Kit 3 $2,758.95; shaft $222.95 (snippets) detroitspeed.com A whole front suspension project, not a steering swap. Belongs with the suspension/stance section.

C. Steering shaft, rag joint, and column

Tier Item Part # Price Link Notes
Good Replacement rag joint disc / coupler disc $15.35; coupler $47.29 Performance Online performanceonline.com Keeps stock shaft. Rag joint is the main source of "slop" on old trucks.
Better Borgeson telescopic steel shaft with needle-bearing U-joint, 1977-78 000933 $259.75 sale / $328.10 MSRP (snippet) cjponyparts.com Directly relevant for a '77 (Borgeson's own site lists it as 1977-78 full-size Chevy/GMC with telescoping shaft, needle-bearing U-joint and a rag joint). Optional: the Borgeson box works with the factory shaft and rag joint; the shaft is a slop-removal upgrade, not required. Sister parts: 000932 (1973-76) and 000935 (1979-87; price not confirmed). Description: telescoping shaft, needle-bearing U-joint and a rag joint, so a rag joint is still in some Borgeson kits; read the listing carefully if deleting it entirely is the goal.
Better Universal-joint steering parts, generic Borgeson U-joint $83.49-$133.75; 3/4"DD 36" intermediate shaft $49.27-$74.33 Performance Online performanceonline.com Build-your-own shaft if the geometry is custom. Needs a support bearing (~$34-49) in some layouts.
Better ididit tilt column, column shift, 1973-78 1540760010 (SCS-1540760010) $1,461.00 (Performance Online); a snippet showed $1,404.00 performanceonline.com 8-way tilt, shifter, neutral safety switch included, shift indicator sold separately. Powdercoat extra. Quoted build lead time 6-8 weeks (snippet).
Better ididit tilt column, floor shift, keyed 1520760010 $1,056.00 (snippet) performanceonline.com Only if the trans gets a floor shifter (T56 or console).
Best Flaming River tilt column, column shift, 1973-87 FR30106 (mill finish); FR30106-48BK (black) Mill finish $1,057.99 (CJ Pony, snippet, 403 on fetch); black $1,300.00 (Restoration Performance, fetched 2026-10-12, ON BACKORDER 30+ days); polished $1,302.00 (Flaming River, snippet) flamingriver.com Direct-fit for 1973-87.
Good (budget keeper) Keep the factory column, rebuild n/a rebuild parts only n/a Factory column keeps the stock shift linkage for the TH400. Rebuild bearings/bowl. A 1977 column has a steering-lock and is non-tilt in base trucks; owner should check the actual column.

D. Pump, hoses, cooler, linkage

Item Part # Price Link Notes
Saginaw-style pump, standard n/a $221.24 (remote-reservoir type, non-BB: $176.31) performanceonline.com Reservoir-on-pump style; BBC mounting is a documented problem (see Gotchas).
Saginaw pump with remote reservoir for big block n/a $305.41 same Likely the better match for a BBC bracket; confirm the stud locations.
BBC pump bracket kit n/a $59.11 plain, $78.03 chrome same Classic Industries also lists C10 396-454 brackets for both pump styles. classicindustries.com
Conversion hose kit for GM box n/a $86.03 rubber / $162.20 braided stainless same Buy new hoses; old ones are the leak source.
Inline PS filter n/a $38.46 same Cheap insurance for a new box.
Heidts adjustable PS flow valve n/a $149.00 same Used to tune assist when the quick-ratio box feels too light.
Complete steering linkage kit, 1973-82 power steering 7382SLK not confirmed cjponyparts.com Does the whole linkage (center link, tie rods, idler, pitman). Price not confirmed.
Pitman arm (73-86 power) / idler arms n/a $47.29 / $47.29 (67-82), $47.14 (83-87) same Budget fix; a 1977 uses the 67-82 idler.
Moog ES362S adjuster sleeve, ES2026R/ES2027L drag-link ends as stated not confirmed gmsquarebody.com Forum-suggested part numbers; verify against the Moog catalog for a 1977 C10 before ordering.

E. Hydroboost (brake booster powered by the PS pump)

Item Part # Price Link Notes
Hydropower brake boost kit, POL master HB2-T7387 $731.66 performanceonline.com Fits 1973-87; "firewall and valve cover clearance equivalent to a 7-inch vacuum booster." Pump output of 800-1400 psi, kit makes up to 1800 psi line pressure.
Same kit with Wilwood master n/a $967.80 performanceonline.com
Hydropower hose hook-up kit n/a $342.99 rubber / $400.57 stainless performanceonline.com Required to plumb pump, booster and box in series.
Hydratech Master Power unit HT-7T-3039K (fitment on AZPro page: 1973-1979 C/K, requires driver-side PS pump; CORRECTED from "73-87"). HT-7T-3040K (80-87) not checked and not applicable to a 1977 $860.00 (AZPro, fetched 2026-10-12) azproperformance.com Alternative to the POL kit; billet firewall plate, stainless braided hose set (4/5/6/8 ft), 7.129" installed length, adjustable pedal rod.

Fitment & gotchas

  • Spline and rag joint at 1977. Sources disagree on the year break: Borgeson's own text (via press) says pre-1977 trucks need a half rag-joint connector (part 990012 or 90002004 depending on source), and the In The Garage article says trucks with 13/16-36 spline (1976 and older) need the adapter. A '77 is likely 3/4-30 and needs no adapter, but this should be checked on the actual shaft.
  • Big-block motor mounts and frame perches. Forum experience (Yenko/67-72 searches) says swapping to the BBC frame perches and mounts gives the extra room next to the steering box. Do this before ordering headers.
  • Headers vs box. Hedman truck-specific BBC headers HH626 (1-3/4" mid-length, from $437.46 snippet) and HH632 (2" long tube, from $476.26 snippet) are the ones sold for 1967-87 2WD C10 BBC. Owners report Hedman Nova or Chevelle headers tucking into the frame better but needing frame notching for number-1 primary or linkage tweaks (gmsquarebody 355818, a K10). One 1979 C10 owner reported BBC headers fit from below without removing the motor or starter. The steering box is where fit is tight; the sanctioned fix is a new box with a modest profile, and test-fit with the box installed.
  • Pump bracket. The 75-79 light-truck Saginaw pump has different stud locations than BBC brackets expect; ICT, Skip White and Billet Specialties brackets failed to fit one 1979 builder, who replaced the pump with a JEGS Saginaw-style unit (gmsquarebody 459089). Buy bracket and pump as a matched set.
  • Cheap rebuilt boxes. A forum member's NAPA and O'Reilly rebuilt boxes arrived bound-up or leaking (gmsquarebody 467447). Buy new from Borgeson/DSE/PSC.
  • Borgeson pressure/flow limits. The 800132 is rated max 1450 psi and 2.5-3.0 GPM recommended flow (Dale's/AZPro spec). A stock-style pump is fine; do not pair it with a high-pressure pump or a hydroboost pump set above that. POL quotes 800-1400 psi pump output for its hydroboost kit, so stay at the low end or verify the relief setting.
  • Header port shape vs heads (corrected in the integration pass). Search summaries of CJ Pony's listings describe the 1-3/4" mid-length HH626-V (Hedman 69170 / 69176) as fitting factory-profile heads with a square exhaust port and the 2" mid-length HH629-V as round-port; the shape of the 2" long-tube HH632 was not seen (the first draft's 'HH632 is round-port' was a mis-pairing). Edelbrock's Performer RPM ovals (the project heads, sections 02/90) are described as square-port in standard location, so HH626-V / 69170 / 69176 is the matching family. All of this is search-summary level; hold a flange gasket against the head port before ordering. Raised-port AFR/Trick Flow heads are a separate fit gate (section 02).
  • Pitman arm nut torque is 125 ft-lb (In The Garage); use a puller, not a hammer.
  • Hose connections. Borgeson's box includes adapters for O-ring and inverted-flare styles; use new hoses anyway.
  • Alignment on a dropped truck. Forum guidance for lowered 73-87 trucks: caster +5.0 degrees (matched side to side), camber -0.5 to -0.75 degrees, toe 1/16" in. On C10s the control arm shafts are outboard, so you add shims at the front bolt or remove from the rear bolt to increase caster. An unrestored 1977 C10 measured caster -1.1/-0.4 and camber -2.5/-0.4, so expect to correct sag. Have a shop that handles lowered trucks do it. These are forum numbers, not GM specs; verify against the factory manual.

How it touches other systems

  • Exhaust: headers, collector position and X-pipe routing share space with the box and the clutch/linkage on the left side. Do steering first, headers second.
  • Brakes: hydroboost uses the PS pump and shares its lines. The pump must have enough flow for both (pump output 800-1400 psi cited). A hydroboost failure causes loss of assist for both steering and brakes, so use stainless hoses with proper fittings and keep a good fluid level. Conversely a vacuum booster is simpler but the cam may not make enough vacuum; that decision belongs in the brakes and camshaft sections.
  • Engine/accessories: BBC front accessory drive, water pump (short or long), alternator and A/C compressor brackets all collide with the pump position. A two-groove pulley is required for the Unisteer kit.
  • Suspension/stance: a drop changes caster and bump steer; the linkage and idler arm height must be checked. Detroit Speed's front kit is a bigger step that includes a different steering path.
  • Tires/wheels: wide rear tires do not matter, but wide fronts raise steering effort and tire scrub; a quicker box makes this easier.
  • Transmission: column shift needs a column compatible with the TH400/4L80E; the 4L80E controller may also want the shifter-position input.
  • A/C: compressor bracket and pump bracket compete on a BBC.

Check on the truck

  1. Which spline is on the steering box input and on the lower end of the shaft (13/16-36 or 3/4-30), and does the truck have the original rag joint?
  2. Is the box actually a Saginaw 800 power box, and is there play at the sector shaft and idler arm?
  3. What column does it have (tilt or not, key location, column shift)? The ididit columns are 1973-78 only; the Flaming River is listed 1973-87.
  4. Drum-brake note: the owner says drums, but 1971+ trucks normally had front discs; confirm. That changes spindle and linkage choices.
  5. Are the frame BBC perches and mounts already in place? Is the existing pump bracket usable?
  6. Hydroboost or vacuum booster? This sets the pump and hose plan.
  7. Is the owner open to rack and pinion at $2,400 or more, or should the budget stay with a box swap?
  8. Are the headers already chosen? Test-fit them with the box in place before buying hoses.
  9. What drop is planned (front spindle or coil change)? That changes the alignment targets and linkage.
  10. I did not confirm Lares, Red Head or AGR products and prices; ask whether the owner wants those priced.

Fact-check notes

Checked 2026-10-12 by adversarial pass. Fetched OK and prices confirmed: PSC SGX041-12S $1,695 (Dale's; part/year split correct), Unisteer 8012380-01BBL $2,374.60, POL hydroboost HB2-T7387 $731.66, ididit 1540760010 $1,461.00, ididit 1520760010 $1,056.00, Borgeson 800132 $467.78 (Dale's) / $493.76 (AZPro), POL pump/bracket/hose/rag joint/filter/Heidts/pitman/idler prices (all matched collection page), FridayParts CP50014 $192.27, Restoration Performance Flaming River $1,300, Hydratech HT-7T-3039K $860. Search-confirmed: Borgeson 000933 exists and is 1977-78; Detroit Speed $554.95 and CJ Pony $571.95/$633.63; Hedman HH626/HH632 exist as BBC 1967-87 2WD C10 headers; alignment numbers match the gmsquarebody caster thread; ITG article confirms 125 ft-lb nut and 13/16-36 vs 3/4 spline break at 1976.

Could not fetch (403/bot block): JEGS, Detroit Speed, CJ Pony pages, Classic Industries, eBay, Walmart, bangshift. Those prices stand as search snippets only.

Changed: removed unverified "1987 R10" fitment from 800132 (vendors say 1968-86); replaced Walmart as primary price source; corrected Hydratech fitment (1973-79, not 73-87) and added its $860 price; corrected Flaming River black price/backorder; added Borgeson 1450 psi / 2.5-3.0 GPM limit and header port-shape gotchas; added $176.31 pump option; noted the 000933 shaft is optional. Recommendation unchanged: Borgeson 800132 stays the right call (quick ratio, bolt-in, cheap, serviceable for a 2042 teen driver). Red Head and Lares remain forum-endorsed only with no confirmed price; a PSC-branded page sells Borgeson telescopic shafts, so PSC boxes pair with the same shaft. Still unverified: the $1,215.92 rack and pinion kit identity, Moog ES362S/ES2026R/ES2027L fitment, 7382SLK price.

Sources 43

  1. jegs.com
  2. jegs.com
  3. cjponyparts.com
  4. azproperformance.com
  5. walmart.com
  6. gmsquarebody.com
  7. performanceonline.com
  8. detroitspeed.com
  9. cjponyparts.com
  10. detroitspeed.com
  11. dalessuperstore.com
  12. performanceonline.com
  13. performanceonline.com
  14. performanceonline.com
  15. cjponyparts.com
  16. flamingriver.com
  17. restorationperformance.com
  18. cjponyparts.com
  19. cjponyparts.com
  20. cjponyparts.com
  21. cjponyparts.com
  22. chevyhardcore.com
  23. inthegaragemedia.com
  24. bangshift.com
  25. gmsquarebody.com
  26. gmsquarebody.com (front end alignment thread, via search)
  27. gmsquarebody.com
  28. gmsquarebody.com
  29. cjponyparts.com
  30. cjponyparts.com
  31. performanceonline.com
  32. performanceonline.com
  33. performanceonline.com
  34. azproperformance.com
  35. gmsquarebody.com (hydroboost vs vacuum thread, via search)
  36. ck5.com (via search)
  37. classicindustries.com
  38. cjponyparts.com
  39. gmsquarebody.com
  40. fridayparts.com
  41. ebay.com
  42. cdn.shopify.com (Unisteer instruction sheet, via search)
  43. classicindustries.com