I have an alum 2 row without a trans cooler inside. I have the external cooler only on a th350. Temp gets from 150 to 200*. Just got a BTO overdrive, is it going to be necessary to get another rad or will my existing system work?

You want the in tank cooler to warm the fluid on cold days. With just an external cooler the trans fluid can not reach operating temp on a cold day which causes high line pressure with low volume. I can get away with just an external cooler in Florida cause the last time I saw snow was '73 (120 minutes of mayhem, before it melted away).


Larger Dave

Larger Dave: so your saying the external cooler will be sufficient and it won't overheat my trans? I live in south Ga. (10min from Fla line) so I dont see much cold weather either.
I just got back from a hard drive in my car and the temp stayed on 190*, BTO says the O.D. creates more heat than the th350. I guess that I'll just have to watch my temp guage closely when I put it in.

I run no in tank cooler with two B&M 823800 external coolers in series. Autometer oil Temp gauge shows 190°-210° depending upon ambient temp. with a 3400 torque converter 700R4. On a cool 42° morning it never got above 160° after driving 14 miles (not to confident about accuracy of gauge that low). I haven't seen any typical summer afternoon 97°F 78% humidity yet but it's just around the corner.


Larger Dave