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Old 11-21-2019, 04:00 PM
danonly55's Avatar
80 300SD
Join Date: Feb 2019
Location: phoenix AZ
Posts: 50
Rear end gear ratio's

I have a 1980 300sd and I need to know if there is a rear diff I can put in for better highway speeds ?

Revenge is a meal best served cold

1980 300SD, Shotzie
1996 Volvo 850, Dark Night
1997 Ford F350 7.3, The Tuna Clipper
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Old 11-21-2019, 04:19 PM
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Join Date: Aug 2019
Posts: 949
Originally Posted by danonly55 View Post
I have a 1980 300sd and I need to know if there is a rear diff I can put in for better highway speeds ?

you have a 3.07 diff which should be good enough for high speeds and I wouldn't mess with it. mercedes put that axle in this car for a reason.

you can put a 2.88 from 1985 only w126/w123 300 turbos

there are even lower ratios but the yoke size is different.
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Old 11-21-2019, 05:16 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,602
You can cruise at 80+ with that gear if it is running right. How fast you wanna go?

[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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