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Re: Rear end gear swap help!!
Short answer is no your 3.07 carrier (commonly referred to as a 3 series carrier)will only go up to a 3.42 with a standard factory ring gear.
The medium answer is the 3.73 carrier will, go in to your original housing. You will have to do a positive identification on the 77 rear end to be sure you can use the posi carrier from it with the 3.73 gear set.
The long answer is below.
https://www.crawlpedia.com/thick_gears.htm
I have a 3.73 thick gear on a 3 series carrier in my Burban.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
Last edited by HO455; 06-27-2020 at 07:29 PM.
Reason: -2 spelling
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