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Well, minus the removal of the transmission part of the job, it's simple to do if the trans is out Already.
Remove the plug below the input shaft, use a big set of snap ring pliers to remove the snap ring, pull out the old countershaft shim, measure it (just to make sure that the new one you are putting in is in fact slightly thicker), put the new one in, put the snap ring back, and put the plastic plug back.
It's that easy
Even though I don't need it presently, this is very good to know. Many thanks for the reply.
The SPEC extra mass 35lb flywheel does aa real good job as stock replacement on stock cars.
We've used a few and it's difficult to tell the difference between it and the DM.
If anyone is wondering how bad ZF rattle can be - Your welcome to sit in my 92.... Aluminum FW and a serious engine with a big camshaft... it'll drown out a 7.3 Powerstroke at idle.
Will
I bet, aluminum with a black tag and cam. It was noticeable with a 22lb with a blue tag and a hotcam...but the torque it freed up to the wheels more than made up for it.