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Tractor Transporting Discussion Forum

Re: Dodge Transmission

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jimg.allentown

02-20-2014 16:28:55
98.115.105.174



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So why not use the 47RH trans CPU?? One peculiar thing about Chrysler products is that they use a seperate CPU for each function. One for the engine, one for the trans, one for the body functions, another for ABS....and on and on. I don't see why one couldn't use the matching processor for the transmission - unless there is some incompatibility with the engine unit. I do know that the engine computer is the one that signals the trans controller to initiate lockups and some of the shifting functions that are based on engine loading. Last time I looked, the average Chrysler product had as many as 10 computers in it.

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T in NE

02-20-2014 23:47:47
75.234.208.31



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 Re: Dodge Transmission in reply to jimg.allentown, 02-20-2014 16:28:55  
The computer in a factory A518 (pre-94 auto OD) truck could run the OD, but not the lock-up. The transmission has one power wire and 2 grounds, the computer switches on the ground side of the circuit. You would need a stand-alone controller, the pressure switches, or a switch inside to manually engage the lock-up. On a factory manual-trans truck, or 3-speed equipped truck, you would need some way to control both.

There are stand-alone controllers that only require tach and TPS. But the pressure switches are a lot cheaper and accomplish the same thing.

Side note:
You can make the Allison 1000 work behind another engine, the trick is to use one out of a medium-duty application. Since they had the Duramax or a Cat engine available in it, it picked up tach off an internal sensor instead of the engine computer.

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