Used GM 12-Bolt Rear End for Sale — VIN-Verified.
Used & remanufactured differentials and rear axle assemblies — VIN-verified for the correct gear ratio, tested, and shipped from Pasadena. 0% restocking, ever.
Used & remanufactured GM 12-Bolt Rear End — VIN-verified, tested, and shipped nationwide from our Pasadena, TX facility. Fits '65-'72 Chevelle/Camaro/Nova, C10 trucks.
The GM 12-bolt is the legendary muscle-car and truck rear axle, with separate car and truck versions that use different pinion sizes and housing ends. Ratio, spline count (30 vs 33), and car-vs-truck casting all matter, so we verify the exact variant against your application. Each carrier is measured for backlash and gear pattern in a SERP thin on real drivetrain specialists. Ultra Auto Parts TX is Houston's drivetrain specialist, and differentials and rear axle assemblies are squarely in our wheelhouse. From our shop at 5041 Spencer Hwy in Pasadena, we stock and source used and remanufactured differentials for trucks, SUVs and cars across the Houston metro — Ford 8.8 and 9.75, GM 10-bolt and 14-bolt, Dana 44 and Dana 60, Chrysler 9.25 and Toyota 8-inch. Every axle gets verified against your VIN and axle tag before it leaves. Drivetrain is our specialty, not a sideline — while general salvage yards sell whatever rolls in, we test differentials on backlash gauges and gear-pattern analyzers and match them to your exact gear ratio and traction setup. Whether you need a complete third member, a full-float rear axle assembly, or a limited-slip carrier, our bilingual (English/Spanish) team helps Houston, Pasadena, Deer Park and Pearland drivers get the right part the first time.
Known issues we check on the GM 12-Bolt Rear End
The GM 12-bolt has separate car and truck versions with different pinion sizes and housing ends, so we verify the exact casting first. We inspect ring-and-pinion, carrier and pinion bearings, and the Positraction clutches, plus C-clip axle wear on the car version. Ratio, spline count (30 vs 33), and car-vs-truck casting all matter, so we match the exact variant to your application and measure backlash and gear pattern before it ships from Pasadena.
Used vs. remanufactured GM 12-Bolt Rear End — which to buy
A tested used 12-bolt is a value when the gears and Posi check out, and ours are measured for backlash and pattern first. Remanufactured or a fresh setup makes sense on a muscle-car build where you want new bearings and a fresh Posi with a longer warranty. We match car vs truck, ratio, and spline to your application. Tell us your build and we recommend the right unit honestly.
Why buy a quality used differentials?
A used or remanufactured differential is a fraction of new or dealer cost, and a complete used rear axle assembly often drops in with housing, carrier, gears and axle shafts already matched. Low-mileage salvage units from the same year/make/model carry the correct ratio and spline count, so you avoid guessing. Reman is built to OEM spec with new bearings and a fresh gear set for longer life and a stronger warranty.
Common signs you need a replacement
Failing differentials give warning signs: howling or whining that changes with speed (worn ring-and-pinion or bad bearings), a clunk on acceleration (worn spider/side gears or excess backlash), metal-flake in the fluid, and chatter on turns from a tired limited-slip. Ignored, spider gear failure or a spun bearing can lock or destroy the axle — replacing the unit is often smarter than a partial fix.
| Feature | Ultra Auto Parts TX | Typical salvage yard |
|---|---|---|
| Restocking fee | 0% — ever | ~20% |
| Warranty | 6 mo – 3 yr | 6 mo flat |
| Fitment | VIN-verified to your vehicle | Not verified |
| Drivetrain testing | Specialized per component | General salvage |
| Service | Bilingual · 10-min response | Varies |
Quick Quote Fastest lead
Send Name + Phone + Part + ZIP. VIN recommended for exact fitment.
Fitment Flags We Check
- Gear ratio MUST match the other axle (and speedometer/PCM) — 3.42 vs 3.73 will not mix on 4WD
- Open vs. limited-slip vs. locker changes the carrier and behavior — confirm what you have
- ABS/traction tone (reluctor) ring tooth count must match your sensor
- Axle width, spline count and flange/bolt pattern vary within the same axle family
- Drum vs. disc rear brakes affect the axle ends and backing plates
- Verify with VIN plus the axle tag / door-jamb RPO or axle code — not just year/make/model
Heavy-duty axles for diesel and tow rigs — Dana 60/70, GM 10.5 14-bolt full-float, and AAM 11.5 out of F-250/350, 2500/3500 and Ram HD trucks — are available and matched to your GVWR and ratio.
What to send for an exact quote
- VIN (best — locks ratio, traction type and spline)
- Year / make / model / trim
- Gear ratio (from the axle tag or door-jamb RPO)
- Open or limited-slip / locker
- Front or rear, and 2WD or 4WD
Every differential and rear axle carries our standard 6-month warranty, extendable up to 3 years on eligible units, with 0% restocking fee on returns — ever. Reman axles get the longest coverage.
Local Houston-area delivery is free with our own drivers; regional runs are a flat $100–200 and out-of-state ships at exact freight cost quoted up front — no surprise fees.
How It Works
FAQ — Differentials in Houston, TX
Where can I buy a used GM 12-bolt rear end near me in Houston?
Ultra Auto Parts TX stocks tested GM 12-bolt differentials at 5041 Spencer Hwy Ste 101 in Pasadena, near Houston. We offer free local Houston delivery and nationwide shipping, open Monday through Friday 8 to 5 Central, English and Spanish. Call or text 281-436-9991 with your application details.
How much does a used GM 12-bolt rear end cost?
Price depends on car vs truck, ratio, and spline count. We never quote from memory — send your application details to 281-436-9991 for the correct tested unit. Every order carries a 0% restocking fee, so there is no risk if plans change.
How do you verify a GM 12-bolt fits my build?
We match car vs truck casting, gear ratio, and spline count (30 vs 33), since car and truck 12-bolts use different pinion sizes and housing ends. We measure backlash and gear pattern before shipping. Reach us at 281-436-9991 to confirm fitment.
Ultra Auto Parts TX is a used and remanufactured drivetrain-parts dealer in Pasadena, TX (Houston metro). 5041 Spencer Hwy Ste 101, Pasadena TX 77505 · (281) 436-9991 · Mon–Fri 8am–5pm CT · Bilingual · 0% restocking · 6mo–3yr warranty.
Shopping for a used differential or rear axle assembly in Houston TX? Ultra Auto Parts TX in Pasadena is Houston's drivetrain specialist for used and remanufactured differentials — Ford 8.8 and 9.75, GM 10-bolt and 14-bolt, Dana 44, Dana 60, Chrysler 9.25 and Toyota 8-inch. Every unit is VIN-verified for the correct gear ratio (3.42, 3.73, 4.10) and open vs. limited-slip setup, tested, and backed by a 6-month to 3-year warranty with 0% restocking. Bilingual service.