They both use the same principle to lock in 4th. They look different so it is confusing to some. These photos were taken from a Chevy High Performance magazine article, not by me, well except for the last one, photo D, which I did take. Also, there are many different variations of valve body's with several different types of pressure switches and wiring schemes. Early R4's locked in 3rd also. This is the reason they have so many pressure switches. My 89 model has only one.
If you have the early type, you may have as many as 4 pressure switches, 1 beside the solenoid, and 3 at the rear. The pressure switch which needs to be changed is the center, rear one. Now again, with so many different variations of these things, you may also have a single wire solenoid.
If this is the case, instead of the GM pressure switch listed above, which is what is needed for the two wire solenoid, you will need GM pressure switch.
To wire the single wire solenoid, go from the TH connector to the pressure switch, then to the solenoid. I think this will work on any of them. I'm no tranny expert, but I believe this to be true.
It only had one pressure switch. It came with a two wire solenoid also. I changed my solenoid to a one wire type, GM , and used the GM pressure switch. Either way works the same. There is no difference in the way it locks. I just happened to have a new one wire solenoid and was changing the fluid and decided to put it in. It didn't change a thing from the two wire one in the way it locks in 4th.
If you do this mod, you change to the new pressure switch, depending on which type of solenoid you have, and leave the other switches in the valve body. Remove the old wiring, but save everything in case you want or need to put it back like it was. Now, this is only a belief of mine. I have absolutely no proof, other than what I have seen. Early 's locked in 3rd also.
I know for sure this to be the case. Why, I don't know, but they did. I firmly believe this is one of the reasons early 's died so quickly. People use these trucks to haul and tow.
Not knowing any better, people would leave it in OD when doing this. So what happens is, it locks and unlocks, over and over again. This will kill them in hurry. It causes them to overheat, which is the number one killer of R4's. Cooling Products. Drivetrain Tools. Best Sellers. Support Technical Resources. Need help finding what you are looking for? Company About Us. What's New. Warranty Registration. CPG Nation. Warranty Policy.
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