Rebuilding gm 350 turbo transmission, inside there's a jagged hole that don't look like it's supposed to be there, but if you take the fluid pan off you can see it and it kind of looks like it is supposed to be there. so basically, is it supposed to be there or not???
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Hows the fluid Look? Red, brown, black? how's it smell? like trans fluid or burnt? What do you have? the 350, 350 turbo, or 400 transmission? Fairly easy to rebuild. By chance( I don't know when they came out) the 700R4. I bit more difficult to build. Find someone that knows about these. Buy the manuals and upgrades. Follow them closely. ATSG.com has them.
Unless you have a LOT of experience modifying cars, you BETTER stick with the manufacturer model of transmission that was already on the car. Some older GM's you could swap out / upgrade transmissions for small-blocks (like replace the 200-metric with a 350-Turbo <HIGHLY RECOMMENDED>, or upgrade the 350 Turbo to a 400 Automatic <check to make sure your car make/model will have enough clearance to allow this>. Fords & Chryslers are not near as forgiving, however. For most of those automatics, stick with the original model type that came with the car. BUT DEFINITELY CANNOT CHANGE DIFFERENT MAKE + MODEL CARS' TRANSMISSIONS (they are NOT interchangable).
The tailshaft housing is removable from the transmission, inside it there is a large bushing that the yoke rides on. That bushing is probably worn out, if so, check the yoke real well too, it is probably worn out as well. The bushing must be pressed in, have a machine shop do it for you. Good luck!
the turbo 350 doesn't have a output speed sensor like the trans that came with the truck orginaly.
You will have to use a cable to drive a pluse generator,or switch the tail shaft housing with a 700r4e housing of the same length,and use the speed sender from the 700r4e or early 4l60e. note the tail shaft is the same splines but the 350 shaft detent hole my not line up with the relucture ring. therfor the output shaft needs to be change to, or have a relucter ring made.
how many miles on trans? does fluid smell burnt?350 turbos are good tranneys but they do go bad. in my experance its reverse that goes out first on thies transmissions but thats not saying that it does not happen the other way either. my best guess is you need a rebuild. when you say it tries to move in forward gear that tells me that the clutches are shot. 350 turbos are worth rebuilding. its up to you.