chasing leaks...TBI 305 / 700R4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**LEEVON** · 05-19-2008, 06:51 AM

I HATE OIL LEAKS!!! I've replaced the oil pan gasket, one-piece rear main seal, oil pressure sending unit, and oil plug. All of the above helped tremendously but... There is a leak coming from up high I don't think it's the rear main again because there's no oil on the flywheel and it's coming down both sides of the bellhousing. I am thinking distributor gasket or backside manifold, any thoughts???

Also I replaced the transmission and it doesn't leak a drop...except for the freaking huge spot it leaked from the brand new tailshaft seal when I parked uphill in my drive the other night. Could there be a burr in the tailshaft or a bad seal, or bad yoke, any thoughts???

05-19-2008, 06:51 AM	#1
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,895	chasing leaks...TBI 305 / 700R4 I HATE OIL LEAKS!!! I've replaced the oil pan gasket, one-piece rear main seal, oil pressure sending unit, and oil plug. All of the above helped tremendously but... There is a leak coming from up high I don't think it's the rear main again because there's no oil on the flywheel and it's coming down both sides of the bellhousing. I am thinking distributor gasket or backside manifold, any thoughts??? Also I replaced the transmission and it doesn't leak a drop...except for the freaking huge spot it leaked from the brand new tailshaft seal when I parked uphill in my drive the other night. Could there be a burr in the tailshaft or a bad seal, or bad yoke, any thoughts??? __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids

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