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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2019 Posts: 172 'Bolter | | 'Bolter Joined: Aug 2019 Posts: 172 | I have a 1950 chev truck 3100 with a 1956 open drive differential with a 3.90. ratio with a 9.375 diameter gear. I am doing a full restoration and I am committed already to a 261 engine a T5 transmission from a 1985 s10 with a .76 OD. I was thinking the 3.90 and the .76 with my 16 inch tires would be a reasonable daily driver . However I took the differential into a specialty shop for a service and was told that the gear set was "severely worn " and that chances of finding another set in good condition would be difficult to say the least. I know I could switch the differential out but I also already have the correct axle conversion kit, rim and tires for the six lug so I am still thinking the path of least resistance is to track down a 3.90. I tried on line Tom's Drive line but they list in a older catalog only the 3.38 which would not work well with the T5 . I have tried other online sites and no luck. I have a phone call out for used ones but of course no guarantees he used one would be any better that what I have. Any suggestions as to locating a 3.90 or other thoughts would be appreciated
Last edited by Rick Brown; 01/28/2021 9:13 PM.
| | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | Im running a 65-66 Chev rear axle under my '46 (had to keep artillery rims), this diff is 3:08 ratio and is just fine with my T-5 and it's low gear in first. A bit high geared but was a gift and I like it just fine. I'd jump on the 3.38! Best of luck | | | | | Joined: Jun 2001 Posts: 793 Bondo Artiste | | Bondo Artiste Joined: Jun 2001 Posts: 793 | I have a nos 3:90 ring and pinion gear set, if your interested send me a PM and we can chat.
~ Phillip
1949 GMC Suburban - 10 year project
1952 Pontiac Chieftain Convertible straight 8 hydramatic
1945 GMC half ton truck - Driver- Sold 9-15-25
1946 Chevy COE - SOLD 1-5-26 BUH BYE CHEVY!
1959 GMC Half ton long bed NAPCO
| | | | | Joined: Aug 2019 Posts: 172 'Bolter | | 'Bolter Joined: Aug 2019 Posts: 172 | Thanks Phillip I thought I replied already but I don’t see it so just in case I am resending . That is fantastic you have a nos 3.90 pinion gear. What are you asking for it?
Rick | | | | | Joined: Apr 2005 Posts: 7,441 Bolter | | Bolter Joined: Apr 2005 Posts: 7,441 | No buying or selling in the garage forum. Take this to PMs please.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
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