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Old 09-11-2012, 06:49 PM   #1 (permalink)
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Diff Ratio

Wondering if any one knows were i can get diff gears for a 500sel online.
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Old 09-11-2012, 07:32 PM   #2 (permalink)
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I would think your best bet would be a junkyard
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Old 09-11-2012, 09:56 PM   #3 (permalink)
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Smile Diff gears

Quote:
Originally Posted by TUF500 View Post
Wondering if any one knows were i can get diff gears for a 500sel online.
Are you sure you need diff gears- not just the bearings? The diffs are pretty bulletproof.
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Old 09-11-2012, 11:58 PM   #4 (permalink)
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I want to change the ratio
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Old 09-12-2012, 05:15 AM   #5 (permalink)
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Stock Gen I 500SEL ratio is 2.24. Finding a 2.65 or 2.82 diff is very difficult. Took me over a year to find a 2.82 diff for my 84 500SEL. Of course, I had to have limited slip and the diff had to have ABS, further limiting availability. If your car has ABS, you need a diff with the ABS gear on the pinion shaft, or you need to buy the ABS gear and have it pressed on. You can't use the ABS ring gear on your current diff pinion shaft - wrong # of teeth. If you don't have ABS, an option is to find a 2.65 LS diff from a 450SEL 6.9 all of which came with a 2.65 ratio and the diff pumpkins are identical to a Gen I diff. However, if you need ABS, again, you have to install an ABS ring gear (only Euro 6.9's were optional ABS - no US 6.9's had ABS).

Look at this post I made for more info:

http://www.benzworld.org/forums/w126...ferential.html

Here is a 2.65 R&P set from a 6.9 for sale by RennTech - $600 that would work in your Gen I pumpkin:

http://www.ebay.com/itm/MERCEDES-116...41ba86&vxp=mtr

One last point - if you change the diff ratio, your speedo will be inaccruate by the % change in ratio (i.e. from a 2.24 to a 2.65 = 18% error in speed reading). You have to live with it, have your speedo re-calibrated by a speedo shop or install a Dakota Digital module that alters the speed reading.

Al
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Last edited by alydon; 09-12-2012 at 05:48 AM.
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Old 09-12-2012, 06:32 AM   #6 (permalink)
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there is nothing off the shelf cause i was thinking of going with 3.40 or somthing around that mark
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Old 09-12-2012, 08:51 AM   #7 (permalink)
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Just my opinion, but anything around 3.40 is not very driveable. Besides, there are limited diffs in existence higher than 2.82 from Mercedes for the W126 except for the ultra rare AMG Gleason-Torsen diffs that were available in the mid-late 80's. The early Euro 380's may have had a ratio over 3:1 that might work. Some owners have tried inserting a Quaife diff in the 126 carrier, but I have not seen a successful attempt yet.

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Old 09-12-2012, 06:57 PM   #8 (permalink)
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You can get a 3.27 out of an early euro 380, usually ABS equipt. It'll need to be out of a '79-'80.

If you want out of the box Renntech has what you need. They have some left over from when they would swap in Gleason carriers and change the gears. They have had these for sale for quite a while now, don't be afraid to make them an offer (Really nice guys to deal with, though a bit pricey):

MERCEDES 126 CHASSIS SCLASS RING AND PINION 3.27 RATIO | eBay

Not sure where you can get the 3.47, I might have that in a 280 I'll be parting. It would have the high gearing but I don't think it has ABS.
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