The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Option for budget manual transmission upgrade

**LockDoc** · 02-05-2025, 03:15 PM

-
I don't care what rear end you have in it, I can guarantee you the truck will be a lot more fun to drive with a 5 speed in it compared to an SM465, This is experience talking, and a lot of years of it.....

If you want a pretty tough factory 5 speed manual don't rule out the Jeep AX15 or the Toyota Supra Turbo R154 5 speeds.(basically the same trans) There is an adapter kit available to bolt them up to the Chevy bell housings and they are a pretty stout manual 5 speed. The adapter is a little pricey but it is milled, and the kit comes with an input shaft bearing retainer and mounting hardware.

https://www.novak-adapt.com/catalog/...it-gmax15.html

I bought the kit and I have a '91 Jeep 2WD AX15 trans installed in my '34 Ford Coupe behind a Chevy 377ci engine and haven't had any problems with it..

If you are replacing an SM465 and are using the above adapter you will need a bell housing adapter ring, get it from here:

https://www.advanceadapters.com/5403

LockDoc
.

02-05-2025, 03:15 PM	#21
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 26,098	Re: Option for budget manual transmission upgrade - I don't care what rear end you have in it, I can guarantee you the truck will be a lot more fun to drive with a 5 speed in it compared to an SM465, This is experience talking, and a lot of years of it..... If you want a pretty tough factory 5 speed manual don't rule out the Jeep AX15 or the Toyota Supra Turbo R154 5 speeds.(basically the same trans) There is an adapter kit available to bolt them up to the Chevy bell housings and they are a pretty stout manual 5 speed. The adapter is a little pricey but it is milled, and the kit comes with an input shaft bearing retainer and mounting hardware. https://www.novak-adapt.com/catalog/...it-gmax15.html I bought the kit and I have a '91 Jeep 2WD AX15 trans installed in my '34 Ford Coupe behind a Chevy 377ci engine and haven't had any problems with it.. If you are replacing an SM465 and are using the above adapter you will need a bell housing adapter ring, get it from here: https://www.advanceadapters.com/5403 LockDoc . __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 02-05-2025 at 03:21 PM.