Transmission cooler

[Russell]

Iv'e got a gas burning 366 G.M.C. with a 545 Allison transmissiom .I want to run a cooler outside my radiator so there is no chance of coolant getting in my transmission. I've done this many times on THM 350 and 400 but I'm not so sure it can be done on this beast. Would I be screwing with some kind of thermostatic control for the transmission if I did this? Russell

[paul iossi]

most of the heat in an automatic is generated by the torque converter, it starts making heat as soon as you start the engine(sliping). IMO as long as the fluid is warm enough for the pump to fill the converter, you're good to go. check with your local NAPA parts house for the largest trans cooler they have, its sized for medium duty vehicles. I put one on my p/up when the factory external cooler failed about three years ago and have not had any issues with the trans being to cold.

[Russell]

Thanks for the information Paul , I wasn't sure if a outside cooler could be used with this transmission for fear of perhaps mess'n with a thermostatic control in the tranny its self, so I guess its off to the parts house, thanks again Russell.