Has anyone seen trans gear ratios by number? I'd also like to know what trans was mated with what rear end ratios in what year.

My 84SD speedo reads low and it would be nice to correct it. I think that the 84 & 85 SDs have an electronic speedo but different trans ratios. I can find out the rear end ratios by rotating 1 wheel and counting drive shaft revolutions but don't know what was originally installed in the 98.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.