Synapsis

My 700R4 has a ~30000 GVW B&M transcooler on it, in front of the radiator behind one of the fog lights on my Iroc. I have a temperature sensor in the tranny pan, and I'm lucky if the fluid gets over 110 degrees F during the winter. Is there a negative effect to running my tranny so cool?

MdFormula350

recent new thread about the tranny temps.

Danno

Good question and there are as always differing opinions. The stock trans cooler in the rad acts as a heat exchanger warming the fluid as the engine heats up. Most experts recommend using the stock cooler in the rad in conjuntion with the aux unit unless you live in a hot climate or subject the trans to hard or severe duty. Just like motor oil ATF is subject to changes in flow as temp rises or falls. I would be more concerned with how long it takes to get up to temp than the actual temp itself. Ever notice that a cold tran tends to shift a little firmer? Line pressure changes as the fluid heats up. If it concerns you I would have the system flushed completely with synthetic ATF. Syn ATF has better low temp flowability and will provide better performance over a larger temp range.

Synapsis

Since I live in southern Arizona, it does get fairly hot here. After about a 2 hour drive through stop and go traffic, my tranny temp might get up to 150F during the winter. I don't have the stock cooler anymore since I have a Griffin radiator, so I suppose I'm stuck with a cool tranny regardless. My tranny has slipping problems in the first place, it just slips a little less when it's running cool.

Thanks for the info.

brodyscamaro

and I thought my grandfathers 2002 HD truck just had a jacked up gauge when it took it a long time to get 125* then a bunch of hot off roading to get to 150 ish