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hey everyone my name is is marc first time here

martrain

martrain

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Kamloops bc
Hi i have a 84 chevy G30 28 Foot class c motorhome with a 6.2 l diesel and TH400 transmission with only 67500 original miles (approx.) I live in British Columbia and i am trying to find a new or reman torque converter for it as mine just went nuclear! I figured out it was the torque converter when i removed it and you could hear it , it sounds like a bunch of broken glass and metal rolling around inside! I am also doing the replacement on the side of the road

I have another TH400 tranny that came from a gasser. I am switching it to diesel spec with the parts from my old transmission IE: valve body, governor, etc. Any help or advice would be much appreciated. thank you
 
Welcome. No idea on the specs for the tc. I can’t remember them being the initial cause of failures, usually they were the victim of something else coming apart- but it is possible.

Often fine debris doesn’t get cleaned from the transmission cooler and the debris ruins the new transmission. I’ve had to simply bypass the cooler with afoot long piece of hose for a week until a new cooler could be installed. Obviously you have to take it easy without one.

Inspect the flywheel for cracks while it is accessible. Not common but possible, especially when a tc gets beat up.


There is a ton of advice we can give about the 6.2 but tor now focus on the problem at hand is probably best.
 
Be sure you drop the pan and clean out any debris, fresh fluid and filter. a failed torque converter can destroy a trans in a hurry!

the main issue swapping them from a gasser is the low RPM stall a diesel torque converter will have over a gasser. if the gasser is a 454 you should be find, but if the engine in the gasser is a 305 (5.0) or a 350 (5.7) the RPM stall will be higher causing the trans not to feel right when shifting. it will work to get you home but youll want to find on with the right RPM stall.

while your at it, if you have access to an air compressor, do like will says getting the trans cooler and line cleaned up. what I like to do is pull the cooler so you have it out of the vehicle. this means if the cooler is part of the radiator youll have to pull the radiator. use some brake cleaner that evaporates quickly (usually the flammable kind) spray it into the cooler and use the compressor blow gun to flush with. spray and blow in both directions until nothing comes out. keep a rag on the end so you don't get sprayed with chemicals and oil too!! do the same for the steel line running to the trans too. make sure all the brake cleaner is out of the lines before hooking it all back up to the trans.

Since your on the road it might be better to just go to the local auto parts store and pick up some oil cooler rubber hose, clamps and a aftermarket trans oil cooler to completely bypass the factory cooler. then when you get back to your home base, do the flushing of the cooler.

Once you get it back up and moving, take it easy going up hills and whatnot. if any damage has been done to the clutches in the trans, you won't make it home pushing it too hard. plan to do a total rebuild on the trans, after a converter failure if the trans hasn't gone yet it will soon.
 
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