06Sierra2

i use both, no issues here

tarinitup

iTrader: (11)

Both. The silicone just to hold the gasket in place for cover.

fastlt1

iTrader: (4)

I use silicone on all my gaskets except transmission.

HEADHUNTER92

just had my cover off and found spiders gears about to be wiped out.cleaned the old gasket off the rear and cover.applied black rtv. let set for 10 minutes or until it didnt stick to my finger.installed the cover.no leaks.if i use both its only enough to hold the gasket in place. now im waiting on the mail man to deliver the truetrac,then i get to tear it apart one last time. (i hope)

HEADHUNTER92

like the last gent said. dont use silicone on the trans cover. or the engine oil pan. if you happen to use to much in a given area and it comes off inside it can plug the filter for the pump. then its dooms day for the rest of the componants.

Daryn

iTrader: (19)

felpro gasket with a light smear of BLUE oil resistant rtv. let it get really tacky before you put it on. let it sit for 30 min- 1 hour and your good

3406a

Factory gasket with hi-tack spray sealant just to hold in place. Torque to spec and you are all good.

dirt track racer 81

iTrader: (45)

I've always used a bead of silicone on rear diff covers. Some vehicles come factory with silicone. Dodge has some good silicone that turns pretty hard.

Fastcount03

iTrader: (13)

I've always just cleaned and used paper gaskets, and I've never had an issue. I guess it's just personal preference, but the main thing is making sure you have good clean sealing surfaces.