I hope I didn'e miss the answer to this in the knowledge base, but I did look.

I have a 1991 Sonoma that I put a 1998 5.7L Vortec and 4L60E tranny in. With me and 20 gallons of gas it weighs 3260 pounds. I do not tow anything...just a daily driver.

The engine/tranny came from a C1500 truck and was equipped with both an oil cooler for the engine and a tranny cooler. I removed the engine oil cooler and that worked fine. My question is can I also remove the tranny cooler?

Can I just plug the 2 ports on the side of the tranny that the cooling lines connect to? Will this cause the tranny to overpressure or get damaged in any way?

Is the 4L60E designed to require a cooler? Will I damage it by not running a cooler? Should I use any particular transmission fluid (I use Redline in the engine and the differential)?

Thanks for all your help!!

Dave

the number 1 cause of automatic transmission failure is heat. always run a tranny cooler. with a 4L60E don`t rely on the cooler in the radiator either, run a aftermarket external cooler.

Yes, the 4L60E must have a cooler hooked up.

Do not plug the cooler line holes

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[color=red]Engines aren't inherantly designed to make use of an oil cooler, but one is added in certain cases (snow plow prep package, diesel, heavy duty, towing). A transmission is designed without provisions to self cool as necessary, and almost all transmissions have provisions for external cooling lines to send the fluid to something elsewhere that will assist in the cooling process.
The most common place to have the transmission fluid sent to is the outlet tank of the radiator. The most efficient method is to send the fluid to an external cooler mounted in front of the radiator.
Heat is the number one problem an automatic transmission can have, followed by abuse.[/color]

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Thanks very much for your help, DoubleVision, Crosley and M&M!!!

I really appreciate it.

Dave