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Originally Posted by AtlBenz
oh man, this car suffers from hella turbo lag! well at least thats what I call it. I havent called around yet, but its something I want to do. Any idea what a used diff goes for?
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Most used diffs are in the $300-$500 range, depending on availability & demand. If your car has ASR you need an ASR donor diff, and vice-versa. If you're content with the 2.65 diff I believe those are plentiful and cheap from an E320 but requires swapping the rear cover and all flanges. There's one from a W140 that I think has the correct flanges, I'd need to look at that again though. The 2.82 ratio would make it even quicker but you would REALLY need to put fatter wheels & tires on by that point, the silly 195/65's on 6.5 wheels would be crying 'uncle' pretty quick. If your 400E has ASR, a 500E diff should bolt in, but those are awfully rare due to the handful of 500E's imported in the USA.
I had started a listing of differential specs & part numbers, to see what diffs will easily swap. However I only completed the W124 info, I did not get all the R129 and W140 data. I'm working on it though. Here's what I have so far (small PDF file) :
http://www.w124performance.com/docs/mb/other/differentials.pdf
Ack - just realized the limited 129/140 data is only on my Excel spreadsheet, I didn't put it in the PDF file. I'll need to rectify that too.
Note that changing the axle flanges is not really a big deal, but changing the driveshaft flange (at the flex disc)
IS a really big deal, as it's also the pinion crush sleeve preload... this is best left to a dealership, IMO, unless you have the special tools needed.
