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Does anyone know if they will work together?

Ehh..... nevermind. Doing a little research I found that while the b4/t4 still used 3/8 x 5/8 outdrive bearings, the 4.1 and 4.2 switched to 10 x 16 mm outdrive bearings. What I was looking to use is based on the 4.1 and later diff.

when i realized AE was going full metric, i bought as many t4 diff kits i could stand to pay for...i wish i thought about the gt cvd's too...

now, to try and retrofit a gear diff in to a sae case.....

I would have thought the 4.1 and 4.2 would have had the same diff as the previous T4 models. I don't have my manuals handy at the moment but have you checked part numbers on the gear case etc?

The B4/T4 used a T2/GT diff and 9574 trans case

The .1 and .2 used the 9852 outdrives and 9826 gear diff trans case.

Hmm, I had to get out of bed to look

What a stupid idea, every bearing in the kit is imperial while the diff bearings are metric.

Just to confuse things the RTR T4.1 uses the standard GT diff while the FT T4.1 an T4.2 use the 10x16 bearing diff.