Northstar Engines and System Technical Discussion Discussion, RWD 5-speeds in Cadillac Engine Technical Discussion; The Jeep/Dodge AX15 5-speed, the Jeep NV3550 5-speed, the Toyota R150F & R151F, the 87-92 Toyota Supra Turbo R154 and ...
The Jeep/Dodge AX15 5-speed, the Jeep NV3550 5-speed, the Toyota R150F & R151F, the 87-92 Toyota Supra Turbo R154 and the Isuzu AR5 5-speed all share the same case to bellhousing bolt pattern. As such there are a number of possibilities that can be had when a 5-speed is desired:
96-99 Dodge Dakota 2.5L bellhousing: Connects all to any Jeep 2.5L L4. Because of it's GM inherited 60 degree bolt pattern, it also works with any Buick FWD V6 and supercharged V6, any Chevrolet 2.8/3.1/3.4 V6, any Cadillac 4.1/4.5/4.9 V8, any Isuzu 3.5/3.5 DOHC V6 and with a minor modification (moving a bolt hole), any Olds Aurora DOHC V8 and Cadillac DOHC Northstar V8.
The R154 out of the 87-93 Supra Turbo is a particularly robust gearbox and is used quite extensively by Australian hot rodders to back up V8 conversions.
Further info: Jeep AX5, Toyota G52/G58, W55, W56, W57 and W58 5-speeds all share a common face pattern on the case. As such, any 88-99 Jeep 2.5L bellhousing (NOT Dakota) will bolt a Toyota W series transmission to a 60 degree GM bolt pattern (and Northstar with the bolt hole mod). The Non Turbo Supra W58 is not as strong as the R154, but is still no slouch.
There are some links there you might find of interest. Also, take a look at this pic from the Pirate 4x4 board. It shows both the Wrangler and Dakota bellhousings. They both have the GM 60 degree bolt pattern.