swissie

I can't find any data what the BTU value of a PG trasnmission cooler in a C2 is. I'm curious how it compares to a modern small Derale plate and fin cooler.

dplotkin

Doubt that it is published but perhaps one of the P.E.'s here will figure it out. In my experience plate type exchangers are very efficient and likely more so than the loops of tubing found in old style radiators. The Power Glide was often air cooled on low power versions via vent holes in the bell housing and is known to be tolerant of heat, cold, wanton abuse, and neglect perhaps more so than any other automatic transmission.

Dan

swissie

Well Dan, that's exactly my issue having upgraded to a 700R4 which would probably benefit form a better cooler.

'75

I'm installing a 2004R into a 65 and eliminating the external cooler for one in the new radiator. My thought is that the lock up torque converter will produce less heat than the PG. I've installed several of these transmissions in C3's using the integrated cooler in the radiator without issue.

dplotkin

Maybe. However the typical Power Glide was capable of towing without the heat reduction achieved by the lockup clutch of the 700. I think you will be good.

Dan

swissie

Given the fact that the shifter gets very hot when the trans is not in OD, as in city driving or twisty backroads, I have my doubts...

Vega$Vette

What's the down side of running an external cooler?

'75

There are pro's and con's for both internal and external. I like the internal cooler because it's very efficient and also helps the trans get to operating temp in cool weather. Another thing not to my liking is the external cooler taking up real estate in front of the condenser as well as the extended rubber hoses. If this were a tow vehicle, then more cooling might be needed. My C3 has a trans temp gauge as well as the internal cooler, it runs within a few degrees of engine temp which is ideal.