Teflon seal rings : Huh !

[mo-cars]

I've always used iron seal rings in my trans builds , because the teflon ones didn't look right to me .
But since the trans was in pieces , I did an experiment . With the front clutch mounted on the pump i did an air test of the clutch pack , first with the iron rings , then the teflon .
Result : the clutch pack clamped fine with the iron rings but not at all with the teflon rings .

 

[fishy68]

I noticed the same thing as you the first time I tried a bench pressure test but once installed they will work fine under pressure. Been using them for a few yrs. with zero problems

 

[mo-cars]

OK that gives me some confidence , i guess atf is thicker than air . do you use the teflon in all areas.

 

[fishy68]

So far I've only used them on the reaction shaft on torqueflites. I've used them in other transmissions in different areas of the trans

 

[70aarcuda]

yes..the Teflon seems not to work very good on the air test...I use Vaseline to hold them in the groove...

 

[oldkimmer]

I prefer the iron also, but their getting almost impossible to get ahold of nowadays. Kim

 

[mo-cars]

Always good to hear the experience of others .