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Discussion Starter #1
has anyone tried to swap a auto out of a 99 to a 98 12v what all you have to do with the computers and what not if anyone has a answer on this or know where i can find out please message me thanks
 

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The 12V and 24V manuals are the same. That will work no problem. It's a very straight forward install. The computer does not seem to care one bit and my truck runs just like it used to (except a lot faster now). Basically bolt on all the parts and drive.

The only difference on the automatic is the electronics on the valve body. You will have to change that out. Other than that it should be straightforward as well just swap over all the parts and coolers. The computer I'd imagine would need reflashed for an automatic before it would run correctly.

Hope this helps.
 

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thanks so i can use the same comp in the 99 that i am putting the manual in with a auto comp but with the 12v i will have to send comp to get reflashed and put a different valve body in how about the wiring would i have to get a harness to or should the wires be there and what do i get for a valve body a 12v valve body or a 24v thanks jeremy
 

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Yes, that's right about the comps.

The 24V auto truck will have the wiring you need for the new manual to make it work.

On the manual truck I'm not sure what you could do to have the auto wiring. It's not there to begin with. You may have to changeover the harnesses on each truck so you will have wiring for the auto. There might be an easier way, I dont really know.
 
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