rear main seal leak?
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Topic author - I sleep in my van
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- Joined: Fri Jan 19, 2007 2:07 pm
- Location: Mission Viejo, CA
rear main seal leak?
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
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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- I plan to be buried in my van
- Posts: 2224
- Joined: Sun Jan 06, 2008 6:57 pm
- Location: Elgin, IL
Re: rear main seal leak?
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
1997 Astro (Grumpy - $250 Rally Van) - AWD, 4.3L, 3.42, LSD, 2" lift, 31" tires, 335k+ orig engine, $30 eBay fuel pump
Prev Astros:99,97,00,94,87,86
2005 Astro (Gandalf) - AWD, 4.3L, 3.42, 130k+ miles
1997 Astro (Grumpy - $250 Rally Van) - AWD, 4.3L, 3.42, LSD, 2" lift, 31" tires, 335k+ orig engine, $30 eBay fuel pump
Prev Astros:99,97,00,94,87,86
Re: rear main seal leak?
Check the oil pan gasket. I thoght my rear main was leaking but it turned out to be the oil pan gasket..
Scott
Scott
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- I sleep in my van
- Posts: 431
- Joined: Fri Jun 08, 2007 11:50 pm
- Location: Orange County, CA
Re: rear main seal leak?
+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.
Whatever you decide to do, PM me if you need an extra set of hands.
Whatever you decide to do, PM me if you need an extra set of hands.
-James
1987 LT
249,000 miles
1987 LT
249,000 miles
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- Retired
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I plan to be buried in my van
- Posts: 1209
- Joined: Wed Sep 20, 2006 5:42 pm
- Location: Lost Angels, Sovern KarlyFornia.
Re: rear main seal leak?
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.
`86 V8 Lowered Cargo, extensively modified, shaved bald, wearing the shortest, sluttyest white primer dress....
A British Wanker living in So KarlyFornia.
My Astro tows my toys to Glamis sand dunes http://www.youtube.com/watch?v=jp2pqjQtpso
First ever canal jump at Glamis http://www.youtube.com/watch?v=oXZjM84x_Xc
A British Wanker living in So KarlyFornia.
My Astro tows my toys to Glamis sand dunes http://www.youtube.com/watch?v=jp2pqjQtpso
First ever canal jump at Glamis http://www.youtube.com/watch?v=oXZjM84x_Xc
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Topic author - I sleep in my van
- Posts: 724
- Joined: Fri Jan 19, 2007 2:07 pm
- Location: Mission Viejo, CA
Re: rear main seal leak?
Thanks for the advice everyone. Be careful James of what you offer; you know I'll take you up on it.
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.

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
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