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| | | Forums66 Topics128,066 Posts1,055,874 Members48,428 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | Your 90 has basically a TH400. GM upgraded in 91 to the 4L80E (overdrive) which is electronic computer controlled. Perhaps someone offers a kit for the conversion. You might try Bowtie Overdrives. The 1500 series trucks used a 700R4 overdrive whch may also work with some possible differences in the tailshaft length, yoke, and u-joint.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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