Pull the tranny or lift the block?

Fox Body · 11-11-2003, 01:10 PM

Hey guys, I noticed that my rear main seal is leaking on the '79 so I gotta get my lazy butt out there and correct this problem b4 it gets too cold out there.

What I found out that I don't know, though, is if the rear main seal on the pan on the '87 351W block is separate from the pan gasket or not. Will I be able to just pull the tranny and change the rear main seal or will I end up having to unbolt the motor mounts and lift the engine and replace the entire seal/gasket? It's not leaking anywhere else (is totally dry all the way around the pan except the back).

RoadWarrior · 11-11-2003, 09:51 PM

Well if its the actual rear main seal your going to have to figure out if its a one piece rear main or a 2 piece. If its one piece you can probably pull the yranny and do it through the back otherwise your going to have to drop the pan and pull the pan.

Fox Body · 11-12-2003, 01:19 PM

Thanks for replying.

Cool. Found out it's a one piece so I can just pull the tranny and flywheel.

11-11-2003, 01:10 PM	#1
Fox Body Mustang Maniac Join Date: Sep 2000 Location: GA, U.S.A Posts: 2,266	Pull the tranny or lift the block? Hey guys, I noticed that my rear main seal is leaking on the '79 so I gotta get my lazy butt out there and correct this problem b4 it gets too cold out there. What I found out that I don't know, though, is if the rear main seal on the pan on the '87 351W block is separate from the pan gasket or not. Will I be able to just pull the tranny and change the rear main seal or will I end up having to unbolt the motor mounts and lift the engine and replace the entire seal/gasket? It's not leaking anywhere else (is totally dry all the way around the pan except the back). __________________ 351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body

11-11-2003, 09:51 PM	#2
RoadWarrior Registered Member Join Date: Apr 2000 Location: Edmonton,Alberta,Canada Posts: 317	Well if its the actual rear main seal your going to have to figure out if its a one piece rear main or a 2 piece. If its one piece you can probably pull the yranny and do it through the back otherwise your going to have to drop the pan and pull the pan. __________________ Fast Company

11-12-2003, 01:19 PM	#3
Fox Body Mustang Maniac Join Date: Sep 2000 Location: GA, U.S.A Posts: 2,266	Thanks for replying. Cool. Found out it's a one piece so I can just pull the tranny and flywheel. __________________ 351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body

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