I installed a TF SC shift kit the 904T in my brother's 83 van. The transmission leaks from the converter area while running. I have been told that this *might* be due to the line pressure being too high. It is possible that the line pressure might be too high since the instructions in the TF SC kit tell you to back the line pressure screw almost completely out, significantly raising the line pressure of the transmission.

Tomorrow my brother is bringing his van to my place to try and fix the transmission leak. I would love to solve this problem without pulling the transmission so I am more than willing to attempt to adjust the line pressure before I back the transmission off the engine to replace the pump seal and bushing.

So, my question is this: can anyone tell me what the line pressure should be in a 904T transmission with a TF SC shift kit installed? Anybody happen to have installed this kit, not had their tranny leak, and then taken a line pressure reading?

Thanks. If I can't fix this with a line pressure adjustment, I will pull the transmission, pull the front pump, replace the converter hub seal, replace the pump bushing, and chamfer the drainback hole and try again.

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Casually looking for a Clifford hyperpak intake for cheap.

Don't know for sure, but I doubt, it is do to line pressure. When you have the converter out, look at the neck of the converter. I have seen several with a crack from the corner of the "notch", back toward the converter body. The crack will allow fluid to leak from the neck outside of the seal. This along with an inspection of the seal and bushing. Very few leaks from the vent. Mostly from overfull, or over heated.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thanks Charlie. I also am dubious that this leak is from too high line pressure, but I figure dropping the valve body is easier than dropping the whole trans.

I hope it isn't a cracked converter. The converter was purchased new last year. I think I still have an old 1979 lockup converter from a 79 Aspen stashed away in the garage. At least I have that as a backup.

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Casually looking for a Clifford hyperpak intake for cheap.

You have to look very close for the crack. If there, it will just be hairline. It would have a tendency to open up under load, when driving the pump. How bad is the leak? Just a drip, a dribble, or a stream?
Make sure to inspect the pump bushing and the mating area of the comverter.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

My money is on a cracked converter pump drive hub, especially if this was a new replacement stock converter... Sorry, Read.

Lou

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Home of Slant6-powered fun machines since 1988

There is no leak with the motor off, but a fairly rapid dripping with the motor on. It isn't a stream like someone pouring it out, but it will drip about three or four times per second. A puddle builds up rapidly with the engine idling in neutral.

Argh. At least I have a spare.

Actually, if the converter is bad that might be why the transmission had a shuddering problem before I disabled the lockup. Hmmm.

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Casually looking for a Clifford hyperpak intake for cheap.