thermostat ..... 180 or 195 ?

[wdudetocool]

hey guys... i have put a 4t65e-hd tranny on my non-supercharged engine. <which works beautifully-thanks again harodude> my question is do i want to keep the 195 thermostat in my engine ,or should i put the 180 one in? i ask because i read that the hd trannys are designed to run cooler than the non hd tranny, which i would have thought the other way around.....

[Nocrank]

I'd go with the 180 to keep everything a little cooler all the way around. I put a 180 in mine and the coolant tends to run around 195. Never checked what the 195 kept the coolant at but I imagine it was around 205-210. It won't hurt to keep everything cooler it may even last a bit longer.

[crash93ssei]

Both are fine, you will basically notice no difference with either.

[FasGP]

180 is the way to go. An aux trans cooler is even better way to take care of that trans, cause the stock one has always been a poor one.

[2003 SSEi]

IF you dont have the Tune changed to have the Fans turn on @ 180*, then that Thermostat really doesnt do that much.