My 1931 Model A Coupe. Transmission oil is leaking into the differential. I know that because the oil level in the transmission goes down and the level in the differential goes up. I’m using 600 W oil purchased from the parts suppliers. I don’t know if the rear transmission bearing seal is in place. I have driven the car several hundred miles since purchasing it and have just discovered this condition. My question is, is this a problem that warrants pulling the transmission to check the seal? I will appreciate your comments. Thank you.
Transmission Oil going to Differential
- Thread starter ALJ
- Start date
Kurt in NJ
Well-known member
have you checked to see if the vent hole in the shifter tower is open
GRutter
Senior Member
Original bearings were not sealed. New bearings are sealed. It is typical to pull the seal on the transmission side.
There is also an oil slinger on the rear bearing.
Check to make sure that the vent in the transmission tower is open.
Check that the oil level in the transmission is no higher than the filler plug - the rear main transmission shaft is well above the oil level.
Check that the differential housing is FULL of grease.
There is also an oil slinger on the rear bearing.
Check to make sure that the vent in the transmission tower is open.
Check that the oil level in the transmission is no higher than the filler plug - the rear main transmission shaft is well above the oil level.
Check that the differential housing is FULL of grease.
GRutter
Senior Member
Sometimes I amaze myself by what I meant to say.
Corrected to "Universal Joint Housing"
Jim Brierley
Well-known member
This is correct. My pickup is lowered front and rear, so the torque tube slants down at its front. I had the reverse problem, oil was transferring from the diff into the trans. I reversed that seal so it now keeps the oil in the diff. Works great!
gdmn852
Well-known member
Hello, does not seem to be that uncommon, just drain the rear to filler plug , and replenish the transmission, unless is excessive. Buick also have the problem, made worse with a Dynaflow, as ATF and gear lube don’t mix , usually a spring differential lube change is common.
