Adapting the
Chevrolet & GM Standard Shift Bellhousings
to the
Jeep T90A & T90C Transmissions
This adapter assembly makes for a strong and convenient adaptation of classic standard shift GM bellhousings to the T90A & T90C three-speed, as was the popular transmission found in many 1946-1971 Jeeps.
If using a GM bellhousing that has a 5-1/8" bore, you will require the following sizing ring: 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. |
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Sizing Ring for 5-1/8" Chevy Bellhousing 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.
Novak Adapter Versions Available
This adapter is simlar to our #C Series kits, but is only 3/4" thick, instead of 2-5/8".
This kit does not require a new input shaft or cluster gear. It utilizes the factory input gear and works with the 2.79:1 first-gear T90A or the 3.34:1 first-gear T90C. This version will not work with the T90J, long input shaft transmissions.
It is required to move the T90 & Dana 18 transfer case forward ~2" in the Jeep to avoid engine interference with the firewall. This will require a floor/tunnel cover modification.
The Adapter
This plate style adapter is machined of a high-grade 6061 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.
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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.
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.
Installation
The adapter is easily and quickly installed onto the T90. Disassembly of the transmission is not required.
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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
The 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.
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| 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. |
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| 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.
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| 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. |