Custom 12 bolt car differentials with many features to improve your differential strength, if you are breaking 10 bolt differentials in your GM muscle cars this may be the answer you have been waiting for. These units will work in El Camino's, Chevelle, Monte Carlos, Camaro, Caprice and Impala's replacing the 8.5" diameter ring gear and pinion sets with large 8.875 inch  hardware. These Custom differentials including the following:

  • Enhanced tube ends to accommodate larger axle bearings
  • Larger wheel bearings and seals
  • Custom Axles 60% stronger than stock axles, no C-clip's
  • Available in 60. inch for El Camino and early Camaro, or 62.5" widths for Chevelle, Monte Carlos, Caprice Impala and late model after 73 Camaro.
  • Axles have 1/2" screw in lugs or stock studs, 5 on 4 3/4" pattern
  • Backing plate modifications and installation of your brake hardware
  • Assembled and set up by a race technician with 23 years experience


These units are offer under our exchange program, you supply your existing 10 bolt differential, we manufacture your custom differential assembly using your original  differential as a pattern to ensure that all brackets, mount,  hangers are in the correct position and adjusted to the proper angle. Allowing you to just drop in and connect brake lines and install driveshaft assembly.

Price $1550.00 exchange (you ship your 10 Bolt core) plus outbound freight, this price includes all new internal components with the gear ratio of your choice selected form the following list of available gear ratios :

3.08   3.73   4.56
3.42   3.90   4.88
3.55   4.10   5.14

The following options are available for you to select from:

  • Add a heavy duty girdled differential cover $145.00
  • Add a Auburn Limited Slip Positraction Pro Series $440.25
  • Add a Eaton Limited Slip Positraction $420.65
  • Add a Solid Locking Positraction by Lockrigth Performance Series $360.00
  • Add the new no-slip Positraction by Powertrax $415.00
  • Add disc brakes $650.60




We also offer the Housing and axle kit (un-assembled) your cost $1080.00, shock brackets add $29.95, other components also available separately. 

Just need Ring and Pinion Set

Bearing Overhaul Kits

14 Bolt Differential Upgrade