88 GMC TC front output flange - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lugnut · 10-16-2003, 02:12 PM

Does anyone know what size socket the nut on the front driveshaft output flange on a 1988 GMC 1/2 ton, NP208, suburban takes? I need to pick up a socket tonite afterwork so I can pull the driveshaft and flange to replace the seal. Thanks.

lugnut · 10-17-2003, 08:54 AM

1 1/8 inch socket in case you guys ever want to know. I went and bought four sockets, thinking one would be the right size. I had not torn the vehicle apart to see what size I needed so it was a shot in the dark. I guessed right. Popped in the new seal and back on the road. How come none of you 4x4 guys out there knew the answer to this question anyway?

Beefcake · 10-17-2003, 11:03 AM

Well, if your driving the pile of crap that Im driving you could have just unscrewed the nut with your fingers and taken it up to sears with you.

By the way, Whats the tork spec on that for the rear diff???

lugnut · 10-17-2003, 02:28 PM

Torque specs for the pinion preload? Depends on whether you are just re-using existing bearings or if it is an overhaul using new bearings and crush sleeve. I cant remember off hand what the torque is for new. If I am just replacing a pinion seal for example, I always mark the location of the nut in relation to the shaft, count the number of threads (or turns of the nut) that are showing and try to get that nut back exactly the same place. I will check my book when I get home.

10-16-2003, 02:12 PM	#1
lugnut Registered User Join Date: Feb 2003 Location: Bismarck, ND Posts: 118	88 GMC TC front output flange Does anyone know what size socket the nut on the front driveshaft output flange on a 1988 GMC 1/2 ton, NP208, suburban takes? I need to pick up a socket tonite afterwork so I can pull the driveshaft and flange to replace the seal. Thanks. __________________ 1967 Chevrolet 1/2 ton 4x4 1972 GMC 1/2 ton 4x4 2005 1500 4x4 Suburban 2004 GMC Envoy 4x4 (wife's)

10-17-2003, 08:54 AM	#2
lugnut Registered User Join Date: Feb 2003 Location: Bismarck, ND Posts: 118	socket size 1 1/8 inch socket in case you guys ever want to know. I went and bought four sockets, thinking one would be the right size. I had not torn the vehicle apart to see what size I needed so it was a shot in the dark. I guessed right. Popped in the new seal and back on the road. How come none of you 4x4 guys out there knew the answer to this question anyway? __________________ 1967 Chevrolet 1/2 ton 4x4 1972 GMC 1/2 ton 4x4 2005 1500 4x4 Suburban 2004 GMC Envoy 4x4 (wife's)

10-17-2003, 11:03 AM	#3
Beefcake Registered User Join Date: Mar 2003 Location: Motor City Posts: 540	Well, if your driving the pile of crap that Im driving you could have just unscrewed the nut with your fingers and taken it up to sears with you. By the way, Whats the tork spec on that for the rear diff??? __________________ 72 GMC Camper Special 2500. currently has 350/350/14 bolt. 383 and 400 tranny is in the works.

10-17-2003, 02:28 PM	#4
lugnut Registered User Join Date: Feb 2003 Location: Bismarck, ND Posts: 118	torque spec Torque specs for the pinion preload? Depends on whether you are just re-using existing bearings or if it is an overhaul using new bearings and crush sleeve. I cant remember off hand what the torque is for new. If I am just replacing a pinion seal for example, I always mark the location of the nut in relation to the shaft, count the number of threads (or turns of the nut) that are showing and try to get that nut back exactly the same place. I will check my book when I get home. __________________ 1967 Chevrolet 1/2 ton 4x4 1972 GMC 1/2 ton 4x4 2005 1500 4x4 Suburban 2004 GMC Envoy 4x4 (wife's)



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