I'm going to a 700R4 and have heard that I need to change my radiator to one with a tranny cooler in it. Do I need to do this or can I run a auxillary cooler instead? I have been told that with a auxilary cooler the tranny will run to cold. The 700R4 needs a radiator with a tranny cooler.

Mike, you can run just an aux cooler, tap in a trans temp gauge somewhere to find out what temps you're running. You can always adjust that reading. gl

What temp range should it run at? graemlins/clonk.gif

Tried running an auxillary cooler only, got stuck in traffic jam for 15 minutes, traffic started to move, no mor upshift, tranni cooked.
Trans rebuild $700.00 up
Rebuilt rad with proper cooler $300.00
Finding out the hard way Priceless
I would use the rad cooler along with auxlary cooler.

Hmmmm. .. I ran my 10+ yr old 700 with a B&M trans cooler only for 4-5 years, and didn't have any problems. Maybe I was just lucky?

I agree that you can run just the auxillary, I do it all the time. I make sure the cooler gets good airflow and cooling fan coverage.

I like to see the trans temp between 170-190 degrees.

Maybe get a transcooler with a electric fan already on it. They will work off of temperature control. On the other hand, by the time you get one of those units you could purchase a radiator at a local parts store for about the same money...