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Old 10-12-2007, 09:12 PM   #1
goldengoat2
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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.
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Old 10-12-2007, 10:33 PM   #2
DieselEater
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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......
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Old 10-13-2007, 07:07 AM   #3
Blazer1970
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Re: 77 ff 14 bolt gear ratio

90% chance it is 4.10.
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Old 10-13-2007, 08:02 AM   #4
snj8198
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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.
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Old 10-14-2007, 07:30 AM   #5
Blazer1970
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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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