1998xjspt

iv already took my transfercase out and 2 times and both times iv failed to get a good seal of rtv gasket. so now will be the 3rd time. each time it ends up leaking. iv used blue, red. and this weekend will try ultra black. so what do you guys use to get a good seal?

1998xjspt

last time i tried (red rtv) i glooped it on and let it sit for an hour. then mated the cases and there was a big ole gloop of rtv all around. so i was sure it wasnt gonna leak..ended up leaking. i want to get it done for the 3rd and final time

BNJeepsta

Why not just buy a gasket?

1998xjspt

they make a gasket for the np231 transfercase?

BNJeepsta

Idk haha I've never looked! I use black RTV for everything

jmu427

Are both of the surfaces clean, flat and free of any gouges? Did you go around the bolt holes with the RTV? I used the black on mine last time. I've only sealed 2 different units though, but neither have leaked.

eloysmanuel

I always use versachem Mega Grey Silicone, seals great. I use it on engine blocks, crankcase, transmissions with no issue

freegdr

Have you replaced the input and out put shaft seals on tranny and transfercaes shafts theres no fluid in between them.

ExTrEmExJ99

The only thing I use is (its called ) the right stuff. costs a little more but deffinetly worth it. Make sure everything is clean and dry I use brakekleen.

ExTrEmExJ99

And this

DougyFresh

I haven't looked at mine but my buddies old 4 cylinder XJ actually had a weep hole between them.

freegdr

There no gasket or sealent used between them its a dry contact area just like where tranny bolts to engine .

freegdr

If either seal starts leaking it drips from there so you see you have a leak.

SteveMongr

What parts are you mating? Most TC's has no gasket and no fluid , it just bolts in. Seals keep fluid inside the TC.
The tailcone is a different story.

cruiser54

UltraBlack or Right Stuff is best. All I've ever seen around the Red or Blue is oil leaks.