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Tractor Transporting Discussion Forum

Re: Dodge Transmission

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Author  [Modern View]

02-20-2014 05:40:37

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I have found that on Chrysler transmissions, erasing the trans codes will usually cause it to start in first as it should, and shift through the gears - at least once. That is, until it encounters an error, in which case it will go directly into limp mode.

My experience with the truck transmissions is limited. I have done much more with the A604s. BUT, if this has the 318 (5.2) engine, it likely would use the 42RLE transmission, which is internally the same as the A604 minus the final drive.

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02-20-2014 06:43:44

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 Re: Dodge Transmission in reply to jimg.allentown, 02-20-2014 05:40:37  
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318 and 360's use 46RH while the 3.9L V6 uses the 42RE 1996-2002.

If by final drive you mean the overdrive section, then yes. These transmissions are 727 variations with an overdrive unit bolted onto it. Valve bodies are all the same except for a few minor differences between each. (V8, Diesel)

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02-20-2014 07:14:16

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 Re: Dodge Transmission in reply to PretendFarmer, 02-20-2014 06:43:44  
By final drive, I mean the parts that would have made up the rear axle/differential in a rear wheel drive vehicle. The basic trans is made up of two units internally - the input assembly and the rear unit. Input consists of a set of 3 clutches with a push/pull piston to give overdrive, underdrive, and reverse functions. The rear unit consists of a low/reverse clutch and the 2/4 clutch. This is similar through the 42 series transmissions and their derrivatives. The A604 adds a differential, ring and pinion, and a transfer shaft to the unit to accomodate front wheel drive. The 727 is a very strong and reliable unit. It was from an era when cars typically weighed in over 2 tons, and had 400+ V-8 engines. Alond with this were the Ford C-6 upon which the E4OD is derrived, and the GM THM400 which became the 4L80. Currently, new offerings are using up to 8 speeds in the automatics. Dependability is yet to be seen. Some of the newer units have even eliminated the oil check/fill tube. Not a good idea IMHO.

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T in NE

02-20-2014 11:05:41

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 Re: Dodge Transmission in reply to jimg.allentown, 02-20-2014 07:14:16  
A518, 47rh/re, 48re are based on the 727, essentially a 727 with lock-up converter (except the 518) and OD bolted on to the back. A500, 42/46's were based on the 904, as was the 3 speed from the Neon.

The 904 and 727 are identical as far as design and function, except the 904 uses lighter-duty parts.

Diesel guys say the 518 was not available with a lock-up converter, I can't say though as they had both small-block and diesel versions of it.

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02-20-2014 12:12:29

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 Re: Dodge Transmission in reply to T in NE, 02-20-2014 11:05:41  
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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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