Thread: TH350 troubles

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I just bought a TCI streetfighter TH350 with B&M holeshot 3000stall 10in converter for my 420hp 355 camaro. I'm running royal purple ATF and I'm running throught the stock tranny cooler and a aftermarket cooler too. The TH350 was working great and shifting awesome. When you first drive the car and everything is a bit on the cool side(engine,tranny) and you hammer it, the transmssion works great and shifts good.When you drive around town for a half of a hour and you hit it the tranny seems too kinda lock up, it doesn't slip slip, almost like it's stalling but at 5000-6000rpm? I raced a nitrous camaro one night, it took us 10 minutes to drive out to race. I was driving below my stall. The first race was embarrasing. I left the line the engine and car was moving, about 4000rpms the tranny seem to kinda locked up, when it did it, the engine couldn't revved passed the 4000rpms. The tranny does it when drive around for a bit and does it at a higher rpm at full throttle, I check the fluid it was quart low(the other night it was full)the fluid didn't smell burnt or anything. I added a another quart of the same royal purple ATF. The car cooled down I took out on a open road and nailed it and everything worked great. I drove it around town for 20minutes and nailed it and it did the same slipping lock up thing!. when i park the car theres is no fluid left on the ground. I don't have tranny temp guage i will get one. I don't see how is getting hot i have the fluid running throught the radiator and the cooler. I worried that the TH350 is getting damaged everytime it has it's spells. Does anyone know whats going on? or have suggestions?

check your shifter cable kink? mine has kinked felt like it went intog ear but didnt acted like it missed a gear

I'm less than impressed with TCI as a company. I had to call them to find out the yoke length for my Sons Streetfighter c4, and it was like calling Deliverance. Jethrow couldn't quite understand what I was asking, and neither could Bubba when I got transferred to him.

Not sure where they are, but I bet there are some dogs laying on the office floor and a couple of barrels where they all sit around and shoot the breeze all day.

It gave me the feeling that we will keep our fingers crossed on how the tranny performs. At least we bought it from Summit, and they have been good about returning defective items. If I were you, I would call whomever you bought it from and ask them what's up. (If you bought it directly, GOOD LUCK!! )

Don

Deliverence! that's funny Don Sounds like case porosity when it warms to temp, the fluid is seeking other avenues instead of maintaining proper line pressures and direction. Follow Don's advice and get that thing exchanged. My personal experience with TCI has always been good with any possible glitches that have occured. Give a try and good luck.

ive had a couple TCI trannys and had a shifting problem with one of them. they advised me to remove and clean the govenor and govenor valve. it worked great after i did that. just call them and ask for thier suggestion.

What a friend and I think the problem is that fluid is being spit out he speedometer gear drive opening or out the vent hole. I just have a plug for now. the original 700R4 speedo housing doesn't fit the th350,so i just plugged it for now,which could be the problem. I'm going to changed the transmssion fluid to Type F and change the filter out. I'm going to put paper towels around the speedo plug and the vent hole and see if it's spitting fluid. I want to find out if tranny is puking fluid, (because then it's obivous what the problem is) before i call TCI.
the transmission has a vacuum modulator, but i don't have it connected, I run the tranny manually the way i like it

So, you'r esaying that when fluid level is low (cool tranny), the things works fine. When the fluid level is higher (warmed up), the thing acts up? And all the while it has a leak that you suspect. Why would it act normal with lower fluid levels and do dumb stuff when the levels rise? Go ahead with the testing because everybody needs to find the bugs causing the problem. It seems weird that synthetic fluid reacts to normal thermokinetic situations as regular mineral based fluid and acts weird like this.