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Re: Dodge Transmission

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Author  [Modern View]

02-20-2014 12:12:29

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I do believe thats correct. I visit the 1st gen section on Cumminsforum and a common upgrade for them is a very low stall converter to make up for non lockup.

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T in NE

02-20-2014 15:23:02

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 Re: Dodge Transmission in reply to PretendFarmer, 02-20-2014 12:12:29  
Only thing is I don't know if the small-block 518's could have had lock-up or not. Goerend will make a non-lock-up converter that's tight enough you can engine brake against it.
And with a handful of pipe fittings and a couple pressure switches you can swap in a 47RH and have lock-up and OD without having to turn it on and off every time it needs to shift.

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02-20-2014 16:28:55

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 Re: Dodge Transmission in reply to T in NE, 02-20-2014 15:23:02  
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

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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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