Why should I upgrade rear end differential?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Spalma916 · 12-17-2019, 10:34 PM

Hey guys, I have a 69 c10 torn down to the frame, freshly sandblasted and painted. It has the original back end no leafs and I’m wondering if I should just clean and paint it or replace it off another truck or purchase one? It’s not going to be a daily driver but it won’t be a show car either, any ideas?
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Gigem · 12-18-2019, 12:10 AM

If it ain't broke, don't fix it

**davischevy** · 12-18-2019, 12:14 AM

There is no reason to change it.

**truckster** · 12-18-2019, 12:56 AM

What's your goal? Is the truck getting more horsepower, or staying mostly stock? How do you plan to drive it, and do you know what the current rear end ratio is?

If you plan to run it hard, you might want to consider upgrading to a limited-slip and/or changing the gear ratio. But if you are leaving it mostly stock and driving it only occasionally, the stock 12 bolt rear end is very stout.

Ziegelsteinfaust · 12-18-2019, 01:48 AM

Leave it or rebuild it. A nicely built 12 truck is good for 500+ hp.

If your shooting for the stars or running big tires there is little that cant be done to it to survive most situations

**biketopia** · 12-18-2019, 09:18 AM

Quote:

Originally Posted by Ziegelsteinfaust

Leave it or rebuild it. A nicely built 12 truck is good for 500+ hp.

If your shooting for the stars or running big tires there is little that cant be done to it to survive most situations

This right here, unless you're going to all out drag the 12 bolt can be set up to handle pretty much anything you throw at it. I'd figure out what gears you have in it and then decide what you want to do with the truck and that will help if you should do limited slip, change gearing etc...

68 P.O.S. · 12-18-2019, 12:21 PM

The only thing you need to change is the gear oil. These are great rear ends.

toolboxchev · 12-19-2019, 01:56 AM

Yea, I would change the fluid, inspect for wear and leave it if possible. These trucks were built on a pretty solid foundation or platform.

That is, until the EPA got involved which really does not affect them until 74.

12-17-2019, 10:34 PM	#1
Spalma916 Registered User Join Date: Apr 2017 Location: Sacramento Posts: 23	Why should I upgrade rear end differential?? Hey guys, I have a 69 c10 torn down to the frame, freshly sandblasted and painted. It has the original back end no leafs and I’m wondering if I should just clean and paint it or replace it off another truck or purchase one? It’s not going to be a daily driver but it won’t be a show car either, any ideas? Posted via Mobile Device

12-18-2019, 12:10 AM	#2
Gigem Registered User Join Date: Feb 2012 Location: Lakeway, TX Posts: 335	Re: Why should I upgrade rear end differential?? If it ain't broke, don't fix it __________________ 1972 GMC Sierra Grande (current truck) 1980 Chevy Stepside (gone) 1987 Chevy Blazer (gone) 1972 Chevelle SS Convertible (gone) 1973 Chevy Corvette (gone) 1967 Chevy Camaro (STOLEN!)

12-18-2019, 12:14 AM	#3
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,814	Re: Why should I upgrade rear end differential?? There is no reason to change it. __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

12-18-2019, 12:56 AM	#4
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,882	Re: Why should I upgrade rear end differential?? What's your goal? Is the truck getting more horsepower, or staying mostly stock? How do you plan to drive it, and do you know what the current rear end ratio is? If you plan to run it hard, you might want to consider upgrading to a limited-slip and/or changing the gear ratio. But if you are leaving it mostly stock and driving it only occasionally, the stock 12 bolt rear end is very stout. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

12-18-2019, 01:48 AM	#5
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,582	Re: Why should I upgrade rear end differential?? Leave it or rebuild it. A nicely built 12 truck is good for 500+ hp. If your shooting for the stars or running big tires there is little that cant be done to it to survive most situations

12-18-2019, 12:21 PM	#7
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,660	Re: Why should I upgrade rear end differential?? The only thing you need to change is the gear oil. These are great rear ends. __________________ 72 C10 lwb fleetside -stock 350/350 combo

12-19-2019, 01:56 AM	#8
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Why should I upgrade rear end differential?? Yea, I would change the fluid, inspect for wear and leave it if possible. These trucks were built on a pretty solid foundation or platform. That is, until the EPA got involved which really does not affect them until 74.



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