rear main seal leak?

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LaGrasta
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rear main seal leak?

Post by LaGrasta »

I bought a new drain plug and gasket and there is no more leaks at the plug finally. But now I see drops from between the engine and trans. Rear main seal, huh? My hope is to not replace that until I need to replace the trans (which works perfect). ideas, suggestions?
1998 Astro, 246,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box

ihatemybike
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Re: rear main seal leak?

Post by ihatemybike »

Been there with a good trans. Personally I'd break loose, then tighten all the hardware for the exhaust system, cross member and the fan clutch, then early on a nice Saturday morning rent a trans jack and do the seal replacement. A friend to keep the engine from turning while you remove the torque converter to flywheel bolts will come in handy. With everything broken loose before you touch the trans the job is much easier and you won't feel as hurried. Once the trans is out of the way the seal is pretty easy to swap.
Aaron

2005 Astro (Gandalf) - AWD, 4.3L, 3.42, 130k+ miles
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sfeaver
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Re: rear main seal leak?

Post by sfeaver »

Check the oil pan gasket. I thoght my rear main was leaking but it turned out to be the oil pan gasket..

Scott

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Re: rear main seal leak?

Post by 6spd_monte »

+1 on the Oil pan gasket. I thought the rear main was leaking on my wife's car and it turned out (luckily) to be the oil pan.
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SoCalli V8
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Re: rear main seal leak?

Post by SoCalli V8 »

When you replace any oil seal, always apply a thin film of Vaseline around the lip. Upon start-up, this lubricates the seal until the oil pressure comes up.
Last edited by SoCalli V8 on Tue Jan 26, 2010 6:48 pm, edited 1 time in total.
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LaGrasta
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Re: rear main seal leak?

Post by LaGrasta »

Thanks for the advice everyone. Be careful James of what you offer; you know I'll take you up on it. :cheers: If it's just the pan gasket, I'd be thrilled. I'll have to monitor it for awhile to better determine.

There are two rubber hose looking things, about 2 inches long in the area of the leak. I guess these are over-flows or vent-tubes, but I think the leak may be from there, or certainly near there.
1998 Astro, 246,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box
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