What Would You Do? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMCor70Chevy · 10-27-2007, 01:14 PM

My 12 bolt 3.73 rear end out of a 1970 pinion bearing needs replacement. The gears are all in great shape with no visible wear. Would you guys replace everything or just the needed bearing?

I know the easy answer is to find another rear end but then I would not know what I was getting.

**michael bustamante** · 10-27-2007, 05:14 PM

I would check bearings for pitting and heat discoloration (scalding) and replace the seals if they are factory. Other than that why replace what aint broke

67_C-30 · 10-27-2007, 06:55 PM

Quote:

Originally Posted by michael bustamante

I would check bearings for pitting and heat discoloration (scalding) and replace the seals if they are factory. Other than that why replace what aint broke

+1

wibilly · 10-27-2007, 09:11 PM

i agree unless u wanted to change the gear ratio while you were at it

Cyclone44 · 10-27-2007, 09:44 PM

With everybody else, If your gears are in good shape, Use what you have if your happy with the ratio...George

Jim_PA · 10-27-2007, 11:06 PM

I 5th the motion to use the same gears

69GMCor70Chevy · 10-28-2007, 02:15 AM

I was thinking the same thing guys. Thanks for the reinforcement. The only thing holding me back is a slight desire to run 3.42 gears instead of 3.73, but hey I can live with it. Probably gonna make a trip to visit my uncle as he has been a GM mechanic since the last year of these beauties. That way I can have it done right but also learn to do it myself.

10-27-2007, 01:14 PM	#1
69GMCor70Chevy Registered User Join Date: Jul 2007 Location: Greenwater Lake, SK Posts: 175	What Would You Do? My 12 bolt 3.73 rear end out of a 1970 pinion bearing needs replacement. The gears are all in great shape with no visible wear. Would you guys replace everything or just the needed bearing? I know the easy answer is to find another rear end but then I would not know what I was getting. __________________ 68 Camaro - 327 Original Red on Red Car 69 GMC LWB - Built 350 a Blast To Drive 69 GMC LWB - "Green Machine" One Family Truck 70 Mercury Marauder - Future Project

10-27-2007, 05:14 PM	#2
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,857	Re: What Would You Do? I would check bearings for pitting and heat discoloration (scalding) and replace the seals if they are factory. Other than that why replace what aint broke __________________ 1967custom Last edited by michael bustamante; 10-27-2007 at 05:14 PM.

10-27-2007, 09:11 PM	#4
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: What Would You Do? i agree unless u wanted to change the gear ratio while you were at it __________________ common sense isn't so common anymore

10-27-2007, 09:44 PM	#5
Cyclone44 Step Brother Join Date: Sep 2007 Location: K-town Posts: 4,029	Re: What Would You Do? With everybody else, If your gears are in good shape, Use what you have if your happy with the ratio...George

10-27-2007, 11:06 PM	#6
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: What Would You Do? I 5th the motion to use the same gears

10-28-2007, 02:15 AM	#7
69GMCor70Chevy Registered User Join Date: Jul 2007 Location: Greenwater Lake, SK Posts: 175	Re: What Would You Do? I was thinking the same thing guys. Thanks for the reinforcement. The only thing holding me back is a slight desire to run 3.42 gears instead of 3.73, but hey I can live with it. Probably gonna make a trip to visit my uncle as he has been a GM mechanic since the last year of these beauties. That way I can have it done right but also learn to do it myself. __________________ 68 Camaro - 327 Original Red on Red Car 69 GMC LWB - Built 350 a Blast To Drive 69 GMC LWB - "Green Machine" One Family Truck 70 Mercury Marauder - Future Project



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