I am putting an '85, 2.88 differential into an '83 that has a 3.07. Is there a different gear you can buy for the trans to correct the speedo?

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

Depending on what car.
The Mercedes w123 mechanical and w126 electronic speedometer calibration is done on the speedo head itself.

For a w123 with a 2.88...

You'll need a speedo head with the part number 123 542 27 57 on the face found on the '85 300D

Or if you want to use the original speedometer, then a Ratio Adapter box spliced in the cable will need to be done.
Like this product..
http://www.nhspeedometer.com/


For a w126 with a 2.88...

You'll need a speedo head with the part number 126 542 81 01 on the face found on the '85 300SD

Or if you want to use the original speedometer, then a electronic signal interface would be needed.

Like this product...
http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=126/category_id=287/home_id=59/mode=prod/prd126.htm





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1983 123.133 California
- GreaseCar Veg System

THANKS!

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.