Finally trading the 3.56 for 3.07 axles in my 1991 W250. Of course this is going to screw up my speedometer. I read somewhere you can have the speedo drive recalibrated for the different ratio. Anybody know who does this? Thanks.
the speedo on a 2wd is inside the tailshaft and has diff gears that go on the vss also some times may have to change the drive gear.
4x4 has it on the back of the t-case with a reducer box you may be able to switch internals in there
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