gear ratio

nibbes123 · Post by **nibbes123** » Fri Sep 16, 2011 11:31 pm

This may sound dumb but how would someone know the gear ratio on a diff. not know what year of fiat it came from. I know the early years you had to disconnect the drive shaft to open it up later years you just remove the back cover . But my question is there a number on the diff. housing to go by with.

Thanks
Nick

ventura ace · Post by **ventura ace** » Sat Sep 17, 2011 12:14 am

Fix one end (wheel) so it can't move. Rotate the other wheel one complete turn while counting the number of turns of the input yoke. Multiply by 2. That's the ratio.

Alvon

nibbes123 · Post by **nibbes123** » Sat Sep 17, 2011 8:11 am

Thanks Alvon for the advise

Nick

baltobernie · Post by **baltobernie** » Tue Sep 20, 2011 2:11 pm

There is numbering stenciled on the diff, but most have worn off by now. This is a 3.90 ratio

gear ratio

gear ratio

Re: gear ratio

Re: gear ratio

Re: gear ratio