Thread: GMR Torsen Installed/Pics

I will let the pics speak for themselves

This was a torsen that was used by GM Racing


Stock HD Diff on the left, the GMR Torsen on the right


the 2 parking gears. The Left is the stock park gear with bearing, on the right is the Torsen Park gear with a larger bearing. It also appears that the Torsen park gear is machined to accept that bearing.


The teeth are different although the part number is the same


Sun gear side


the sun gear with the modifications for street use. It also appears that the sun gear is heat treated compared to the stock unit


also a pic of the copper washers on the planets to make the unit for street use.


I will get to test it out here in a few weeks with my Hoosier Slicks

Very nice!

Interested in more information on the bearing that is on the parking gear. In the Ecotech manual it was something that was never really spoken about other than it was modified. To my knowledge the parking gear was only modified for use with the 4.0 GMR Diff. The core of the Torsen diffs are identical between 3.29 and 4.0 only the planatery gears are what change the ratio. Obviously with the larger planatery gears modifications had to be made for the parking gear when used in the 4.0 ratio.