Tranny Pan Gasket. 727

[Catfish-65]

When changing the pan gasket on a 1965 727, what is the better gasket material, Cork or Rubber. The gasket I ordered was Cork and the gasket I recieved with the internal filter was Rubber, Also should any silicone be used with the Gasket.. Just fixing an agrivating leak,, Thanks in advance for any opinions,,,,Catfish (Dave)

 

[Dobalovr]

Normally this would be the only gasket you should ever need for a 727 available at your local Dealer however the 1965 transmissions are different if I recall so maybe one of our experts can chime in. BTW with this gasket no silicone....

Mopar Performance 02464324AC: A-727/A-518/46RE Oil Pan Gasket Molded Rubber - Re-Usable | JEGS

 

[Big_John]

When changing the pan gasket on a 1965 727, what is the better gasket material, Cork or Rubber. The gasket I ordered was Cork and the gasket I recieved with the internal filter was Rubber, Also should any silicone be used with the Gasket.. Just fixing an agrivating leak,, Thanks in advance for any opinions,,,,Catfish (Dave)

Are you sure it's the gasket? Could be the throttle shaft.

Normally this would be the only gasket you should ever need for a 727 available at your local Dealer however the 1965 transmissions are different if I recall so maybe one of our experts can chime in. BTW with this gasket no silicone....

Mopar Performance 02464324AC: A-727/A-518/46RE Oil Pan Gasket Molded Rubber - Re-Usable | JEGS

That will fit a '65 and is the gasket of choice.

 

[1978 NYB]

I use a hard plastic gasket for a 518 txsm. Never leaks and you can reuse them over and over.

 

[BIGBARNEYCARS]

Graham, I found that one of the pure Silicone Gaskets from Real Gasket in Tennessee torqued to their inch pound specs and installed dry runs about the same $ as the Mopar gasket from Jegs. I know your history and the knowledge you possess my friend, but on this one the Real Gasket is the only one I found that would seal on my 727 and I tried the Mopar gasket That Mother is installing on all their 727 now, I just couldn't get it to seal no matter what I tried, Jer

 

[Davea Lux]

The cork gaskets worked well for many years, the modern silicone gaskets are usually an improvement. Far and away, sealing problems are mostly caused by improper torquing or by transmission pans that have had the holes dimpled by over torquing. The dimples around the bolt holes keep the rest of whichever gasket is used from being properly tensioned so that the gasket properly seals. On a good pan, either gasket should work. Run a straight edge along the bolt holes, if you see light under the straight edge, the holes are dimpled. Usually this can be fixed with a ball peen hammer carefully applied with a block of wood the same width as the pan rail on the bottom side of the pan.

Dave

 

[saforwardlook]

The transmission pans on the 727s are a pain. They should have been cast pieces. Nothing but trouble.
The only cast pans I have seen in the aftermarket are the deep "performance" ones. Ugh.

 

[Catfish-65]

Thanks for all the input, it will help a lot, I,ll post how I make out ,,, Catfish....

 

[ALRUI]

Cork hands down and dont over tighten the bolts!

 

[5wndwcpe]

Are you sure it's the gasket? Could be the throttle shaft.

Unfortunately, it's rarely the gasket that is leaking -or- at least it's only "one" of the leaks. Look to the throttle shaft (per John) the dipstick tube, o-ring on rear servo shaft etc. The fluid runs down into the gap where the pan gasket is and runs to a low point making it look like its the pan but it is not. Good luck and let's hope it is the pan gasket.

 

[John Kirby]

I have issues with the transmission line. Next time I work on them I am going to remove the threaded adapters that screw inth the tranny and use teflon tape on them.Not a major leak but having zero leaks is the goal.

 

[68PK21 440.6bbl]

Cork hands down and dont over tighten the bolts!

Plus add one dot of red Loctite to the threads.

"Bob's your unkle" as the Aussie's say!

 

[Catfish-65]

Completed the gasket change with a new cork gasket and at this point all is well. I did check pan face with a straight edge and it was good No leaks so far, Thanks for all the input,,