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

$2,690.00

GM 12 Bolt Posi Upgrades

With 30 Spline 3.08-3.90 Eaton Limited Slip = $2,710.00
With 30 Spline 4.11 & Up Eaton Limited Slip = $2,765.00
With 30 Spline 3.08-3.90 TrueTrac = $2,745.00
With 30 Spline 3.08-3.90 Detroit Locker (Do Not Recommend for Street) = $2,990.00
With 33 Spline 3.08-3.90 Auburn = $2,790.00
With 33 Spline 4.11 & Up Auburn = $2,790.00
With 33 Spline 3.08-3.90 TrueTrac = $2,760.00
With 33 Spline 4.11 & Up TrueTrac = $2,800.00
With 35 Spline 3.08-3.90 Detroit Locker (Do Not Recommend for Street) = $2,990.00
With 35 Spline 3.08-3.90 Wavetrac = $3,070.00
With 35 Spline 4.11 & Up Wavetrac = $3,070.00