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- - 77 ff 14 bolt gear ratio (https://67-72chevytrucks.com/vboard/showthread.php?t=262283)

goldengoat2

10-12-2007 09:12 PM

77 ff 14 bolt gear ratio

I am trying to figure out my gear ratio, Did chevy make a gear other than 3:73 or 4:10 (out of a 77 3/4 ton 4x4) This one doesn't leak , so I didn't want to take the cover off.

DieselEater

10-12-2007 10:33 PM

Re: 77 ff 14 bolt gear ratio

YUP...I got a ring and pinion from an 80' that is 3.55.....??? Might have been special order or something? Most were 4.10

A......

Blazer1970

10-13-2007 07:07 AM

Re: 77 ff 14 bolt gear ratio

90% chance it is 4.10.

snj8198

10-13-2007 08:02 AM

Re: 77 ff 14 bolt gear ratio

yup, seen them with 3.55's to 4.88's, but 4.10's seem to be the norm.

Blazer1970

10-14-2007 07:30 AM

Re: 77 ff 14 bolt gear ratio

Also 4.56 would be the second most common ratio. 3.73s are pretty rare, and any other ratio (3.42 or 5.13) are very rare.

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