3.90 Rear End

goes2fast · November 28, 2009

I'm looking for a 3.90 rear pumpkin for my 620.

Thanks, Jim:):cool:

datzenmike · November 28, 2009

Look on 720 2wds. Look on the pass side inner fender below the hood hinge for the engine tag. Here's one:

Look down in the lower right corner for HF 38

H solid axle housing

F ring gear size 190mm

38 means 3.889 or 3.90 ratio

37 would be 3.70, 41 would be 4.11 and so on. 4X4s never went that low and I thing used a larger drive shaft yoke after '82.

goes2fast · November 30, 2009

Thanks for the info, Jim:):):cool:

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