The TH350, also known as THM350, Turbo Hydramatic 350, or Turbo 350, is a three-speed, automatic shift transmission developed by Chevy and Buick and introduced in 1969. It was typically coupled with Small Block V6 and V8 engines and was used in most of General Motors rear-wheel-drive cars and trucks until 1984.
I read somewhere that the transmission temp. Should be kept around 175 deg Fahrenheit to properly cool the fluid. If anyone out there is using one of these on your ride. 1951 Canadian Chev 1/2-ton Shortbox. Re: transmission cooler for 700r4 [Re: vickraft] #845634 Sun Apr 22 2012 05:58 AM Sun Apr 22. A always flush the cooler before. A transmission swap from a TH350 to 700R4 HD on a 1978 CHEVY Suburban. I've gone threw 4.
The 700R4, also known as TH700R4, THM700R4, 4L60, or 4L60E, is a four-speed overdrive, longitudinally positioned, automatic shift transmission introduced in 1982 as the TH350's replacement. It was widely used in Chevrolet and GMC rear-wheel-drive vehicles until 1992.
I know this is a late response to this thread, but I just finished a 350 to 700r4 swap in my 81 z-28. I used my factory cooler lines with no issue.
I installed a 92 700r4. The fittings probably changed in 93. My My issue was that my full length header collectors were in the way enough to make me contort my arm/wrist in an uncomfortable position to reach fittings to make the connection.
IMO any 70's, early 80' GM cooler lines should work. I know my 72 Buick Skylar had the same cooler lines. That was a beast.