When changing a 3.7 LSD to a 3.9 can you use the 3.9 ring gear in the 3.7 diff housing or do you put the LSD unit in the 3.9 diff housing (using the 3.9's ring gear.)

Is the 3.9 pinion gear different to the 3.7 pinion gear?

 

Cheers,

When doing the conversion I never tried to put the 3.9 into the 3.7 housing.I did hear that the pinion gear may be different.I am sure there is someone who has tried that.

use the housing and ring gear from the 3.9. I've made a couple of 4.11 conversions and taken them both to a driveline shop to have the shims (for the races) dialed in and both times, adjustments were needed. Something to keep in mind.

 

 

When changing a 3.7 LSD to a 3.9 can you use the 3.9 ring gear in the 3.7 diff housing or do you put the LSD unit in the 3.9 diff housing (using the 3.9's ring gear.)

Is the 3.9 pinion gear different to the 3.7 pinion gear?

 

Cheers,

When you've used the 4.11, did you have to swap the pinion gear as well? Or was it just the ring gear?

They are a set so to help insure compatibility keep the ring and pinion together.