Adam Whitman
Member
- Joined
- Jun 10, 2001
30-year old TH400 with old B&M shift kit and 12" stock GM VP converter that worked fine when pulled out. Pulled the trans 2-years ago and long story short it went back in without so much as the pan coming off. Fired it up, ran it in and out of the shop and down the street a few times shifts good everything seems fine.
Pulled a cooler line to pump the pan down before a filter service and there was nothing except a dribble out the return line. Pulled the line and blew backward through it to verify open lines; all is good.
Serviced the trans filter and reassembled. trans still functions fine, but no cooler flow in P, N, or D, high-stall for sure, I think I checked in low-stall too.
Did a search here and my head hurts from reading about converter pressure, thrust bearings, and cooler line pressure. BUT, didn't find anything about what would kill cooler line flow.
All I could dream up is that the regulator valve is stuck or the front pump is so bad there's no volume left for the cooler line. However all of this talk about converter pressure and the cooler line makes me think I'm not understanding the fluid paths correctly.
Help?
Pulled a cooler line to pump the pan down before a filter service and there was nothing except a dribble out the return line. Pulled the line and blew backward through it to verify open lines; all is good.
Serviced the trans filter and reassembled. trans still functions fine, but no cooler flow in P, N, or D, high-stall for sure, I think I checked in low-stall too.
Did a search here and my head hurts from reading about converter pressure, thrust bearings, and cooler line pressure. BUT, didn't find anything about what would kill cooler line flow.
All I could dream up is that the regulator valve is stuck or the front pump is so bad there's no volume left for the cooler line. However all of this talk about converter pressure and the cooler line makes me think I'm not understanding the fluid paths correctly.
Help?