Quote:
Originally Posted by ac130
greetings,
the differential is a 210mm (8.26in) ring gear 3.06 ratio in a 91 w126. which I was assuming was pretty stout, I agree about the axles which will probably need to be improved. As long as axle angles on launch are controlled they'll last longer.
a 4L80E trans (GM)and (we're still on the fence about this) a 2400-2800stall convertor. 1st 2.48, 2nd 1.48, 3rd 1.00 4th 0.75
we'll also be using a one piece driveshaft, the center support bearing isn't going to hold up.
Allen
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ac:
In the event that you are in the US, locating a 3.06/210mm diff, while not impossible, is a bit of a challenge. Some 450SL/SLCs, and some 450SE/SELs had the combination. If you have one, consider using the rear sub-frame from a pre-1986 W126 chassis; the diff will bolt in. The 1986 & later (Gen II) W126 used a resilient mounting for the diff, and as a consequence the sub-frame does not accept the 1st Gen style diff.
If you have already embarked on installation of the gearset into the Gen II housing, rock on. The source of an aftermarket diff carrier for the 210mm center section as used in the 107/116/126 chassis' would be of interest to many on this forum. Although a nominal 210mm diff was used in W140 and later chassis', it is a different design than the earlier ones.
From a strength standpoint, the 210mm case will be quite OK with an auto-box.
Re: Engine & trans
The 4L80 box is significantly larger physically than the MB 722.3 box. Anticipate some floor surgery.