There were bread delivery type trucks built with 4 cyl Cummins engines. They had adapters on them and ran turbo 400 trans. Dennis has acquired on of these setups after talking with Neil Chance Trans. They have said the can set this up to be bullet-proof behind the Cummins. With the motor limited to 4500 and tire limited to 32". The rear gear needs to be about 2.70. Jim