TH350 Problem

[ss3011]

You probably have a seal that is leaking , which is causing a clutch to drag . The hotter the fluid gets the greater the leak that is causing the clutch to drag . What type of ring seals do you have on the pump tower ? Typical types are cast iron with a locking feature or two types of plastic seals one solid , or the second type with a diagonal cut end . The best seal is the solid teflon .

[Terry Cain]

Originally Posted by ss3011

You probably have a seal that is leaking , which is causing a clutch to drag . The hotter the fluid gets the greater the leak that is causing the clutch to drag . What type of ring seals do you have on the pump tower ? Typical types are cast iron with a locking feature or two types of plastic seals one solid , or the second type with a diagonal cut end . The best seal is the solid teflon .

Teflon and front pump has been out a zillion times. Not sure on temp but don't think that is the problem. Deep pan so it has an extra 2 qts. Sharver originally done trans yrs back. He plugged the coolant lines and did some drilling on pump to redirect fluid. The pump has been replaced and wondering if maybe that could be problem?

[ss3011]

I have talked about this before , but deep pans are not designed to increase the cold fill volume , but to lower the fluid level away from the rotating parts . As fluid gets hotter it expands and if that expansion gets the fluid up into the rotating parts it will mix up like a milk shake . That is bad for windage and will also hurt pressure stability , lubrication , and cooling . A deep pan with 2 extra quarts of fluid in the trans will be even worse . Typically you need a re-calibrated dipstick which compensates for the deeper pan .
Since you have a problem with one trans and no problem with another , I still believe a leaking seal is more likely .

[Adger Smith]

Had a customer with a similar problem. took 4 runs to slow down and stabilize. turned out to be a worn converter sprag.

[Terry Cain]

Originally Posted by Adger Smith

Had a customer with a similar problem. took 4 runs to slow down and stabilize. turned out to be a worn converter sprag.

Don't think that the case here. Change tranny out to spare trans with same converter and boom within 1-2 (60 ft) every run. Spare is just not as fast because it does not have alum stuff in it. Spare is an point A to point B trans.

[buzzinhalfdozen]

Originally Posted by Terry Cain

Teflon and front pump has been out a zillion times. Not sure on temp but don't think that is the problem. Deep pan so it has an extra 2 qts. Sharver originally done trans yrs back. He plugged the coolant lines and did some drilling on pump to redirect fluid. The pump has been replaced and wondering if maybe that could be problem?

If the pump was modified for no external cooler and you've replaced the pump this may be your issue. not certain of it but thought they removed the cooler bypass valve to run no cooler, new pump having a bypass valve and setup for external cooler cause an issue with heat?

[Mark Yacavone]

It should push through if outlet plugged..Doubt it would take any hp but worth looking at I suppose.