Transmission pan gasket leaking

[chrismoore701]

Turbo 350 trans. Gasket had a small leak. Just finished a frame off and wanted everything perfect so I changed the gasket and put a new filter on. New gasket is rubber. Followed the proper torque sequence. Leaking more now thank before. Any thoughts? I hate to drop the pan again. I did not use any sealant or gasket material on the gasket

[andyh1956]

Be Damn sure it's NOT the throttle pressure cable o-ring leaking. When fluid is new it's extremely difficult to see & it will run down & get on the pan flange.
You can buy some tracer dye & put in the oil & use a small UV light to see where it is leaking from.

[Jake Wade]

Shift shaft seal, dipstick tube seal, front pump, and as mentioned, throttle pressure cable o-ring are all places where it can be leaking and appear to be the pan gasket.

I prefer a cork gasket installed dry with bolt torque around 7 foot pounds.

[TrailerTrash]

I used a rubber gasket myself and had no luck at all it leaked right away.

mine also leaked from the shifter shaft that was an easy fix they make a tool to extract the old seal then you just pop the new one in.

[S10Fan]

Yes, for the shift shaft seal, please buy the tool, NAPA, less than 10 bucks, using a pick will scratch the shaft and it will never stop leaking.

I used a gasket from "Lube Locker", pricey but effective, along with a new heavy flange pan.

[ron350]

S10FAN is this the correct Napa part # BK 7769250?

https://www.napaonline.com/en/p/BK_7769250

I don’t know if the Napa link will work here.

[S10Fan]

Originally Posted by ron350

S10FAN is this the correct Napa part # BK 7769250?

https://www.napaonline.com/en/p/BK_7769250

I don’t know if the Napa link will work here.

Yes, that's it. Buy it, use it, loan it to your friends and they'll think you're a super hero. LOL

[chrismoore701]

Already replaced the shift seal. I just replaced the pan gasket and now it's leaking. That's why I am sure it is the pan gasket

[chrismoore701]

Bought the tool. Nice little tool

[S10Fan]

Originally Posted by chrismoore701

Already replaced the shift seal. I just replaced the pan gasket and now it's leaking. That's why I am sure it is the pan gasket

If the torque convertor dust cover is still in place, remove it and make sure fluid isn't leaking from the front seal. Fluid from that seal will run down along the pan edges.

Transmission pan..... Make sure all surfaces are flat, someone along the way may have tightened the pan bolts to 6000 ft lbs and warped the flanges.

Gasket.... Buy a quality gasket, Fel-Pro, or Lube Locker (Summit, Jegs, etc)