With the stock cooler, and my Yank, my trans temps were never above 150 with normal driving. Beating on it(datalogging during tuning, and at the track), temps would climb to between 155-160 degrees. Never above that. IMO, 180-200 is way too hot, and when trans damage is possible.

The point that I was trying to make earlier was that having the 40K without the external bypass does not make my(or my friend's) transmission take longer than normal to get up to a normal operating temp. It takes the same amount of time in the winter as it takes in the summer.

Maybe someone from PB or FLT will chime in with their opinion on TFT's.

 

I was told the sweet spot is 160-170. I would also like to know what FLT or PB say.

 

I've always heard 150-180...

Anybody PM Vince or Frank yet?

 

Allright...lemme do it Any guess on who I'm going to send a PM to?

 

 

IMO 140-180* is the sweet spot as you guys are calling it. To be honest as long as the vehicle operating temps are up to temp your good to go. There are few different conditions according to my hydra-matic book for lockup. IMO just because your fluid temp is below 140* does not mean it a bad thing. As long as the TCC can function your fine. Below is some info from my book.

As long as the vehicle operating temps are appropriate for the TCC to be applied, the PCM provides the ground signal for the tcc circuit. Tcc function can happen after the engine is at 68*. The trans fluid temp must be around around 85* and will allow the lu to apply in 3rd gear. After 135* the tcc can be applied at all times in 4th gear, as apposed to having a scheduled LU apply.

I hope this answers some questions. Vince

 

Thank you sir

 

That's good to hear, thanks Vince.

 

So it sounds like as long as the TFT gets to 135 or above we're good to go. Ill do some logging this weekend if I get a chance and see what my TFT actually are.