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Old 10-03-2005, 08:16 PM
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TH350 and heat

I have a TH350 in my '82 El Camino that I believe is on it's way out. To start off, I beleive it to be the metric TH350. Need I say more? But anyways, most of the last drag season the car was incredibly consistent, the last four races I noticed my consistency went away right after I had to make two passes within a short period of time. I also noticed that when the weather was cooler, I ran my car a little more to get it up to the temperature I would normally race at, and my consistency would go away then too. This car would run within 2 to 5 hundreths every time early on in the season, so I think I can rule out heat soak in the engine side. Therfore, the only thing I think has changed is the transmission temperature. It would get hotter and not grip as much as when it was cooler. Am I right in assuming this? If this is the case a new transmission is probably the best course of action (or at least a rebuild, but it's still a metric TH350).

Thanks for your help.

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Old 10-03-2005, 08:23 PM
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350

When you say metric 350, do you mean THM 200? Its pan is kind of shaped like a 350 only smaller. Check out the trans ID listed on this board. As far as I know, there is no metric 350, unless you are thinking of a THM 350C with a torque converter lockup.
Rick
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Old 10-04-2005, 09:12 PM
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I have been told that it is the Th350C and does have the lock-up torque convertor, however, I have never actuall been able to witness the lock-up function to actually work and it is disconnected as advised by my old auto shop teacher who claimed I would break something if it did lock-up. It is the 350 and not the 200. Either way, I was driving the car today and did notice that there was some slip in there that was not there before. All I can figure now is the tranny is pretty much used up by now and I ought to replace it with something a bit more oriented toward racing. Does this sound reasonable?
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Old 10-04-2005, 09:29 PM
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350

Yes, heat will effect the trans operation. Sometimes the internal seals will act differently when cold and hot. The clutch plates could grab differently if they are hot or cold (not really sure on this but I'm sure their friction changes). If it is a stock 350 and you have been racing it you will probably need to rebuild it, especially if it has been slipping. Make sure you have it built by someone that knows how to modify it to make it survive the drags! If you have the tools and the urge to do it yourself, go for it. Get a good service manual and take your time and be very clean and meticulous. Install a shift kit and a new torque converter and see what happens!

Good luck,
Rick
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Old 10-05-2005, 08:19 PM
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This is one of those things I would rather let someone else do and be done with it. I have a whole life to build another one, but seeming as it's my only car I can have the whole job done and installed with a warranty for around $1100. I don't have the right stuff to do it myself. I did most of the big stuff (engine swap) in my High School auto shop where I had the resources to do it right. I've graduated and I am off to college and can borrow a car for a week or so but I can't have my car down for much more than that. I'll tackle a trans when I have the resources and not driving my weekend warrior all the time. oh well, pay your money and the problem will go away...
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