The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Transmission swap- TH350 to 700R4

beanious · 10-04-2017, 06:26 PM

So, another thing that I can pass on. I've logged the temperatures experienced, corresponding to what gears I'm in. I can see why people blow their transmissions by running 4th without overdrive. If you were to mash without OD, you could easily run into a overheat situation and grenade the internals.

Transmission in 4th-Overdrive @2000 RPM
Trans Pan at 140 Deg F.

Transmission in 3RD @2000 RPM
Trans Pan at 155 Deg F.

Transmission in 4th @2000 RPM
Trans Pan at 170 Deg F.

This was all on a 70 Degree day, consistent temperatures and warmed up. Also I do have an external cooler for additional cooling, hooked up right and flowing in the right direction. Yes, the TV cable is set correctly.

10-04-2017, 06:26 PM	#37
beanious Registered User Join Date: Apr 2008 Location: Sacramento, CA Posts: 201	Re: Transmission swap- TH350 to 700R4 So, another thing that I can pass on. I've logged the temperatures experienced, corresponding to what gears I'm in. I can see why people blow their transmissions by running 4th without overdrive. If you were to mash without OD, you could easily run into a overheat situation and grenade the internals. Transmission in 4th-Overdrive @2000 RPM Trans Pan at 140 Deg F. Transmission in 3RD @2000 RPM Trans Pan at 155 Deg F. Transmission in 4th @2000 RPM Trans Pan at 170 Deg F. This was all on a 70 Degree day, consistent temperatures and warmed up. Also I do have an external cooler for additional cooling, hooked up right and flowing in the right direction. Yes, the TV cable is set correctly.