I have replaced a number of seals over the years and never used anything behind them. They are supposed to be tight enough not to leak. But things would change with mineral based oil. That stuff will leak past anything.
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Re: NP231 Front output seal replacement
I have replaced a number of seals over the years and never used anything behind them. They are supposed to be tight enough not to leak. But things would change with mineral based oil. That stuff will leak past anything.
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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