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Username Post: '57 3100 differential        (Topic#355075)
Dr. Danger 
Posts: 2

Reg: 04-09-16
02-03-19 09:14 AM - Post#2758885    

I have a 57 3100 that came from the factory with a 283 with the power pack option and a four speed hydramatic. The differential is a non-posi and I'd like to convert it to a posi but I don't want to convert it to a five lug. Any suggestions?


Ultra Senior Member
Posts: 12282

Loc: Wisconsin..USA
Reg: 09-27-02
02-11-19 07:48 AM - Post#2759613    
    In response to Dr. Danger

A 1957 3100 1/2 ton truck came with a 265 2 barrel engine only. It was a 283 block bored out to 3 3/4" rather than 3 7/8". Also had a lower horsepower rating than a cars 162 HP. The 265 truck engines were painted gray and not orange.
It did not have a "power pac" option.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible

Edited by Gene_Schneider on 02-11-19 07:49 AM. Reason for edit: No reason given.

Dr. Danger 
Posts: 2

Reg: 04-09-16
04-28-19 09:26 AM - Post#2765195    
    In response to Gene_Schneider

I know what I have on the engine as I've mic'd the cylinders and have completed the engine rebuild including the power pac heads and the WCFB 4 bbl carburetor so, the question is not about the engine, it's about the differential. Any help there would be greatly appreciated.


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