TURBO 350 TRANSMISSION LEAKING INSTALL
TURBO 350 TRANSMISSION LEAKING MANUAL

My 81 was doing this and after i got a few quote to r and r my trans (1K) i took the dust cover off and found out it was a couple of things 1st it was the pan gasket PO had over tightened the pan bolts. Just be carefull who you have look at it. Another place a TH350 leaks is from the vent tube on the main case passenger side above the dipstick tube.

TURBO 350 TRANSMISSION LEAKING INSTALL

Replace these two O-rings, lube with ATF from the trans dipstick, and install all items. The case of the tranny is painted flat black with dupli. Pull out the plastic driven gear and look inside the bullet and there is the second O-ring. I use B&M trick shift (conventional) fluid and a B&M Hi-Tek cooler mounted to front of radiator that is actively cooled by puller fans on the other side of radiator.

TURBO 350 TRANSMISSION LEAKING MANUAL

Needless to say in my case I had used a crappy gasket and that was the cause of the leak, and i didnt have it torqued to the correct spec's either.Īs far as the mechanic is concerned he lost mine and my family's business. Got a recently rebuilt turbo 350 trans with a manual valve body and 2400 stall converter. I told him he was out of his f$&king mind and that anybody with little or no brain could see what it was doing.

I took the car to this so called mechanic and he tried to tell me that the trans pump was shot and he was going to have to pull the transmission. The cardboard also keeps the ground clean till you fix the. But transmission leaks tend to drip right below where the issue is. Then lay down another thing of cardboard in a different spot then usual if you can and let the thing drip. What was happening was the transmission pan had a small leak at one of the bolts next to the bellhousing cover and the fluid was spreading or migrating into the bellhousing and dripping out of the weep hole. Top off the transmission then take it down the road so it gets up to operating temp. Missing/damaged sealing ring on the pump hub. The newer style multi-lip, or 'top hat' style seal should be available at most GM parts departments for about 3.50. I believe TCI and Hughes sells a top hat boot seal also for the TH350. Incorrectly installed, damaged, or leaking valve body gasket. If you scroll ebay for a TH350 dipstick tube top hat seal you will see one listed for 8.99. My 70 was doing this after I had change the fluid and gasket. The GM 350 transmission gets stuck forever at 2nd, regardless of your throttle input or vehicle speed That can only mean at least one of the following: Stuck control valves for 2-3 shifts.

Turbo 350 transmission leaking