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Hi all, So I have a gmt800 4x4 5.3 the truck has a single turbo kit and has recently had a bunch of work to it done at a local performance shop had the head gaskets done many other things and the trans rebuilt with upgraded clutch packs a welded sprag, shift kit and 2600-2800 stall converter it also has a 40k tru cool trans cooler. I've been through hell and back trying to get this truck running right and despite the fact I'm super underwater in it runs well its just that the trans runs way too hot I took it out for about an hour a driving on streets little to no highway did a couple pulls and a little traffic trans got up to 250 on the cluster. The mechanic who doesn't really want to deal with it any more. I have close to $20k alone on the truck. with all this how do I get the trans to stay at or under 200 during traffic and moderate-medium intensity driving. perhaps the lines are bad or something, 33 inch tires? I don't know but it gets hot and stays hot even after getting on the open highway it doesn't really cool down. I have been thinking of selling the truck but at the moment I want to keep it perhaps there would be a way to run two trans coolers? I cannot afford a new built 4l60e so any help is much needed and greatly appreciated,
Thank you.
Last edited by turbo5.3-4x4; 05-29-2024 at 11:45 AM.
it's under the radiator at kind of an angle just behind the bottom of the front bumper and the lower plastic part of the bumper has holes drilled in it to increase airflow.
i run a tru-cool 40k on my S10 with 3600 stall in phoeinx az.
i couldnt get my trans to go above 160 so i actually removed the trecool and went with a smaller one to get some heat into the trans.
i know this doesnt help you much, but, maybe your temp sensor/trans temp sender isnt reading correclty?
What does the programming for converter lock up look like. Is it setting any slip codes?
Next step check inlet and outlet temps going into and out of coolers to figure out temp drop across the coolers.
The stock gauge is dead accurate it reads off the thermister in the pan and is the same thermister the pcm uses for all of it's tranny related calculations. But everyone has their own opinions on this one so each to their own.
The reason that I don't trust my stock gauge, regardless of the fact that it uses a scientifically accurate sensor, is that all of the gauges in my cluster are wonky. They all talk like teenagers. "The oil pressure is like 40ish. The engine coolant temperature is like 180⁰, the fuel level is like half full", etc.
it's under the radiator at kind of an angle just behind the bottom of the front bumper and the lower plastic part of the bumper has holes drilled in it to increase airflow.
Since I can not see it, Mounted at kind of an angle might be part of the problem. It needs direct air flow through it to be effective.
Since I can not see it, Mounted at kind of an angle might be part of the problem. It needs direct air flow through it to be effective.
id temporarily move the cooler and see if it helps.
zip tie it to the grill for a week or two--yes itll look silly, but youre diagnosing an issue, not trying to win a beauty contest
05-28-2024, 10:54 PM
Please help me with overheating 4l60e
