Adapting the
Chevrolet & GM Standard Shift Bellhousings
to the
Jeep T90 Transmission

This adapter assembly makes for a strong and convenient adaptation of classic standard shift GM bellhousings to the T90 three-speed, as was the popular transmission found in 1946-1971 Jeeps.

These conversion kits will work with most Chevrolet V8's & Chevrolet V6's (Gen. I thru Gen. III+), Buick V6's, the Iron Duke I4, some Chevy I6's and other GM engines.

The Adapter
This plate style adapter is cast and machined of a high-grade aluminum alloy. featuring a precision machined bearing retainer. Included are the GM bellhousing locator / throwout sleeve, seal and hardware.

Our included retainer is configured for the standard 4-11/16" bore bellhousing. If you have a truck style, 5-1/8" bore bellhousing, add our #BR4 sizing ring to your order.

A pilot bushing is also required and is not included with this kit. Jump to our pilot bushings page to add one to your order.

T90 Versions
If you are not sure of your T90 version, see this guide.

The T90A is found in 1946 to 1962 CJ2A, CJ3A, CJ3B, CJ5, CJ6, M38, M38A1, and also four-cylinder Utility Series Wagons & Trucks.

The T90J is found in 1952 to 1965 four-wheel-drive Utility Wagons & Trucks and Wagoneer & Gladiator Trucks when replacing the I6-226 and 230 "Tornado" engines.

The T90C is found in 1963-1971 Jeeps. Installers should note that a conversion to this version of the T90 would require a new cluster gear. This adds ~$90 to the expense of the conversion and raises the 1st and 2nd gear ratios from 3.44 to 2.98. This may or may not be in the swappers best interest. However, contact us if you do want to go this route. A GM transmission like the SM420 or SM45 may be a better option in this case.

GM Bellhousings
GM bellhousings typically feature either a 4-11/16" rear face bore or a 5-1/8" rear face bore, the latter typically only from Chevy / GM trucks from 1968-1991. Our adapter versions are available for both. If you are uncertain of your bellhousing bore, choose the #G176R adapter assembly, as it features a press-on spacer ring that can be used or removed to cover either situation. The ring is easily returnable for credit if not used in the installer's application.

Mount, rear, transmission, polyurethane Chevy / Jeep / Novak style Part: #RMU Weight: 1 lbs. Price: $36.80 Buy:

Installation
The adapter is easily and quickly installed onto the T90. Full disassembly of the transmission is not required.

Clutch Release
Factory mechanical and aftermarket hydraulic clutch release systems can be made fully compatible with this conversion. Individuals with 1946-1971 factory bellcrank mechanical clutch releases should use Novak's #RAV6 release fork.

Individuals wishing to upgrade to a hydraulic clutch release system can use Novak's #HCR3 hydraulic clutch retrofit assembly.

Engines & Engine Mounting
Novak engine mounting system offers the best designs on the market for strength, ease and flexibility of installation. Whether you are installing a classic Small Block, A V6 or a Generation III powerplant, we've got you covered.

In any scenario, it is critical that the engine be installed (as the Jeep engines usually are) with an offset of 1" to 1-1/2" to the driver's side. Other engine mounts on the market - especially the bolt-in versions - do not take this into account and make other placement decisions for the installer that do not take the full powertrain into account. Novak offers what we have found to be the most intelligent engine mounting system for Jeeps available, allowing the installer to make an easy and satisfying decision as to powertrain placement with the new engine, T90 transmission and Dana 18 transfer case all considered.

Novak's MM Series engine mounts, featuring excellent vibration dampening, superior strength and impressive adjustability - adjustable even after the engine is installed. The design and strength and affordability of our mounts are second to none.

The classic Chevrolet bellhousing, with the four-bolt rear pattern. Buick, Olds, Pontiac and other bellhousings with the same rear face are equally compatible.

Axles
Use of factory axles is completely acceptable with this conversion. Axle upgrades are not necessary, but they may be chosen for reasons external to this engine upgrade.

Generation I through Generation III Chevy V8 engines are popular choices as are the Chevy V6s. The Buick V6 is also a good choice. Installers considering engines with higher power than a classic 350 should consider a Chevrolet transmission upgrade, as the T90 is rated and proven at medium-duty.