'99 5.7 liter rear main seal leaking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**COBALT** · 06-27-2010, 07:59 PM

The '99 tahoe I'm constantly whining about appears to have a rear main seal leak. It has the usual automatic 3spd with overdrive transmission, and I'm noticing some blowback all over the transmission case whenever I do an oil change. It hasn't gotten bad enough to cover the entire case, nor is it burning up on the exhaust yet, but it looks like it is coming from the rear main seal.

Do these 5.7l engines have a two-part seal that can be replaced externally while the engine is still in the rig (by moving the transmission out of the way), or do I have to get nasty with it by replacing it out of the truck with the bottom end of the engine exposed?

06-27-2010, 07:59 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	'99 5.7 liter rear main seal leaking The '99 tahoe I'm constantly whining about appears to have a rear main seal leak. It has the usual automatic 3spd with overdrive transmission, and I'm noticing some blowback all over the transmission case whenever I do an oil change. It hasn't gotten bad enough to cover the entire case, nor is it burning up on the exhaust yet, but it looks like it is coming from the rear main seal. Do these 5.7l engines have a two-part seal that can be replaced externally while the engine is still in the rig (by moving the transmission out of the way), or do I have to get nasty with it by replacing it out of the truck with the bottom end of the engine exposed? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.



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