High Performance Differentials

Custom GM 12 Bolt

Custom GM 12 Bolt Differentials are built to order

Western Differential can customize New GM 12 Bolt car housings casted from Nodular Iron from either Currie Enterprises, Strange Engineering or Moser Engineering. We can also rebuild or upgrade an existing GM 12 Bolt Factory car or truck housing.

Complete New GM 12 Bolt Housing

Moser Engineering Housing -No Brackets- (Includes shipping housing to our location to build)
Your choice of Most Gear Ratios
1310, 1330 or 1350 Pinion Yoke
30 Spline Auburn Limited Slip Posi
All New Timken Bearings and National Seals
30 Spline Strange Engineering P-type (non c-clip) Axles with Timken Set-20 Axle Bearings and Studs
New Chrome Differential Cover

Call for pricing

GM 12 Bolt Posi Upgrades

With 30 Spline 3.08-3.90 Eaton Limited Slip = Call for pricing
With 30 Spline 4.11 & Up Eaton Limited Slip = Call for pricing
With 30 Spline 3.08-3.90 TrueTrac = Call for pricing
With 30 Spline 3.08-3.90 Detroit Locker (Do Not Recommend for Street) = Call for pricing
With 33 Spline 3.08-3.90 Auburn = Call for pricing
With 33 Spline 4.11 & Up Auburn = Call for pricing
With 33 Spline 3.08-3.90 TrueTrac = Call for pricing
With 33 Spline 4.11 & Up TrueTrac = Call for pricing
With 35 Spline 3.08-3.90 Detroit Locker (Do Not Recommend for Street) = Call for pricing
With 35 Spline 3.08-3.90 Wavetrac = Call for pricing
With 35 Spline 4.11 & Up Wavetrac = Call for pricing

GM 12 Bolt Housing Upgrades (Includes Brackets and Weld Time)

New 2" Leaf Spring Pads = Add $60.00 +
New 2.5" Leaf Spring Pads = Add $50.00 +
Mono Leaf Spring Pads = Add $115.00 +
Multi Leaf Spring Pads = Add $125.00 +
1964-1967 A Body Brackets = Add $400.00 +
1965-1970 A Body Brackets = Add $400.00 +
1965-1970 Full Size Car Brackets = Add $445.75 +
1978-1987 G Body Brackets = Add $390.00 +
1960-1972 Chevy C10 Pickup Trailing Arm and Panhard Brackets = Add $370.00 +