All that special tool crap is only to crush the pinion sleeve. You can swap all the guts and check the lash without touching that. You can even change the input flange without messing up the crush; just don't get carried away. You need to put one ring bolt in after putting the carrier assembly back in, but you can just torque that one in place. Rig up a dial indicator on a mag stand. The spacers are specific to the case; none of the dimensions change to the bearing races so just transfer the ring to the new center assembly, confirm the lash is within spec and check the gear mesh pattern and close it up. It doesnt care what rpm you launch at.
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Originally Posted by rwd4evr
I'm using the w126 gen 2 210mm case in this car for the 2.82 asd. It's going to be no different than the modified by Mercedes gen 2 subframe. Underneath it is identical to the gen 1 minus the 4 holes drilled for the diff mount and the small plates for the front mount. It's the same size as the v8 w124 cars as well and every v8 car besides certain special models and the v12 with the reinforced diff. From what I've seen the axle is the weak link and the reinforced uses the same drive spline so...... I'm building another similar subframe for my SLC drift car that will house a w140 3.69 210mm diff. Simply because I don't have the tools to confidently swap the guts and have them absolutely perfectly setup like a factory part would be. 6000rpm clutch dumps say they need to be.
As far as "plug the guts into the w123 pumpkin", the w123 housing is a 185mm. I could use a r107/w126 v8 housing, but the fact that the side spacers and pinion spacers are listed in the epc with .05 mm increments to set the gear lash I'd be much happier to modify the subframe which I'm 100% confident will work without a problem. Plus the main reason is to have the ASD hydraulic locker at my disposal. No gen 1 cars ever used ASD so it wouldn't be usable. I am picking up a second 3.69 diff and I would love to build a 3.69 or 3.46 ASD LSD diff for a street/drift car without a welded diff. But the 3.46 LSD I have is too valuable to take apart really.
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