126 rear in 123?
I have read this before and now I cannot find it.
Will a rear end out of a 126 go into a 123? Are there certain years that will or will not fit? Or will it not work at all? I think I remember somewhere reading that it will work.... |
If by rear end you mean differential, the answer is yes. Differentials from 1981-1985 W126s will swap into W123s. 2nd generation differentials in the 1986-1991 models won't fit.
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You'll have to swap the axle spacer shims but should otherwise be identical.
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Go for a 2:47 rear end from a gasser,and enjoy 37 mpg.
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:D |
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I'm actually looking for another 2:88 (mine is shot). A 3:07 would be OK too. I just want one that is not "sloppy". |
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You will have to change the tri flange. the 126 uses a larger flex disc.
You will have to determine the friction pre load on the pinion nut before removing it. then when you replace the 126 flange with the 123 flange, you will now have to tighten the pinion nut to the original friction pre load torque setting. good time to change the pinion seal as well. here are a couple threads about the pre load. www.peachparts.com/shopforum/showthread.php?t=233540 www.peachparts.com/shopforum/showthread.php?t=81784 Charlie |
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so the I-6 uses the same size as a W123? charlie |
and the diesel.
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Only W126 diffs up thru 85 will fit.
Also, keep in mind that a lower rpm doesn't mean better mpg. It may now require more thottle (fuel) to maintain the same hwy speed since the engine is now not near it's peak torque rpm curve. MPG may drop. :eek: BTW, I just happen to have a spare 2.88 and 2.47. |
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I am running a 307 diff in my 83 240 with euro 300d motor. With the four speed I got thirty highway regularly. I swapped in my five speed and now get 35 36 regularly running 70 to 75 mph. I could pull a slightly taller gear...maybe a 288 but taking off is already a bit dicey with the 307 rear end. (the 307 with the 18% od is about equal to the 247). You'll never get 37 running an automatic imho....unless you run about 50 mph). |
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Sorry for the thread, hijack. |
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