Ok this is my friends work truck.. We pulled out a 6.0 out of the truck and put a 5.3 in it behind a 4l80e. On the tune we just changed spark/ve tables ect. And now out of nowhere the tranny starts overheating.. it can take a 1 hour drive before the gauge goes to the redline. We have checked the tranny lines and they do not seem bent or anything. Started happening after the swap. We did notice the bracket that hold the lines to the block is not on, so the lines are hanging down a little.. can that be the problem? we didn't have time to fix that. thanks for the help!

 

that isnt the problem. did you check the fluid and see if you have ended up with some sort of problem in the trans also in bad luck and crappy timing?

 

Is it possible that you bent or kinked one of the trans cooler lines during the swap?

 

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Had to point that out. JFWY...

blazin...I'm thinking crappy timing, unless you did actually kink a line in the process (as thunder mentioned above ). I've actually snagged the line this past week pulling my 5.3L out. Fortunately, I didn't damage/kink a line. Depending on how bad (if ya did at all) snagged the line when pulling the old one, it may have been enough to kink the flared end of the tube going into the trans. That would suck. Easy thing (but costs some money) would be to have the system flushed, but I would go back and REALLY check those lines before assuming you have a trans problem. Good luck!

 

Oops

 

Yea ill have to check the lines again very good.. I dont think its bad timing, the engine was running good on the truck we pulled it out from.

 

If the coolant temp is good, it's gotta be an internal trans issue or a problem with the lines. The only place where the trans and the engine could interact to make the trans overheat is in the radiator. If the engine was overheating I guess I could see it shooting the trans temps way up because of the trans cooler that's built into the radiator. If that's not it, maybe the lines are touching the exhaust somewhere, although I wouldn't think that it would be enough to cause the whole thing to overheat.

 

Took it to a trans shop. The lines wernt bad or anything. It ended up being the radiator being plugged or something. I guess he ran it when the temps were very high and it has metal shavigs in the pan and the oil is a dark color.