Question about 2006 GMC Sierra

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Replaced rear axle on a gmc 1500 4by4 with a 3.42 gear ratio as the original .but I noticed that I have to accelarate more just to keep up with trafic, do I have to reprogram the on board computer?

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  • Master
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As long as it's the same ratio, it shouldn't effect the computer. I would check the numbers on the rearend to make sure it is the same gear ratio. Or there maybe a problem with the replacement rear end. Is it a locking differential rearend?

Posted on May 04, 2010

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Posted on Jan 02, 2017

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1 Answer

I'm looking to replace the rear axle on my 1997 4 door 4x4 GMC Yukon 3.73 gears would a rear axle from a 1998 Yukon 4door 4x4 with 3.73 gears bolt directly to my 1997 Yukon


yes
the housings will be the same
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if it comes in from the rear ( tin cover removed ) replace the complete housing as you will have to have expertise in resetting the bearing pre-loads for the diff center bearings

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Will a 96 and a 97 gmc rear axles interchange and how do I find the gear ratio


If the axles are from the same size vehicles the answer is PROBABLY yes.
Differential ratio can be calculated by counting the number of teeth on the crown gear and on the pinion gear. Divide the big number by the small number, that's your ratio (to 1)

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How do you pull a 1979 gmc jimmy 4x4 rear right axle


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How do i find out the right gear ratio ring and pinion is for my 95 gmc half ton 4x4 is


Hello: Stand in front of the rear axle, facing the back of the truck, scrape off the paint and rust from the axle tube going to the right wheel. It should be stamped on the axle housing. Or you can count the teeth on the ring gear in the differential. (you have to remove the cover to do that.

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1 Answer

94 caprice classic rear spider gears shot 12 or 16 possi what other rear ends are compatible for this 5.7 liter





. Axle Code >>>>>>>>>>>Standard
2YN Gear Ratio >>>>2.56<<<<< Ring Gear Diameter 8.5 Standard 2GA Gear Ratio 2.73 Ring Gear Diameter 7.6 Standard 2GB Gear Ratio 2.73 Ring Gear Diameter 7.6 Standard 2GH Gear Ratio 2.73 Ring Gear Diameter 8.5 Standard 2LW Gear Ratio 3.08 Ring Gear Diameter 8.5 Standard 2LR Gear Ratio 3.23 Ring Gear Diameter 8.5 Standard 2LY Gear Ratio 3.23 Ring Gear Diameter 8.5 Standard 2LT Gear Ratio 3.23 Ring Gear Diameter 8.5 Standard 6YF Gear Ratio 3.23 Ring Gear Diameter 8.5


Axle Code>>>>>>>>> Limited Slip
2LQ Gear Ratio >>>>>>>>2.93<<<<<<<<<<< Ring Gear Diameter 8.5 Limited Slip 2YG Gear Ratio 2.93 Ring Gear Diameter 8.5 Limited Slip 2LX Gear Ratio 3.08 Ring Gear Diameter 8.5 Limited Slip 2ND Gear Ratio 3.23 Ring Gear Diameter 8.5 Limited Slip 2LZ Gear Ratio 3.23 Ring Gear Diameter 8.5 Limited Slip 2LS Gear Ratio 3.23 Ring Gear Diameter 8.5

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Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSI TRACTION)

HC4 -- AXLE REAR, 4.56 RATIO

Open Your glove box and look inside it. Should be a list of codes on the bottom.
Example: GU6 G80 According to that, you'll have a 3.42 posi

Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

Good luck and keep me posted.

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1 Answer

How do I replace the ring gear and pinion in my 68 Camaro 12 bolt


You can change the ratio back to 4.10. However, if you do not already have the specialty tools required to do the job, you will likely be better off finding a shop that will change the gears for you. A mistake as simple as incorrect backlash will result in destroyed ring & pinion gears.

Your cheaper options will be :
1. Find a matching rear-end with 4.10 gears and swap it in.
2. Purchase the ring and pinion, master install kit, and find a friend that has installed gears before to help you out.
3. Find a 4x4, Hotrod or auto shop that is will swap the gears for you. If the axle is in the car, it's usually more expensive than if you carried the axle in for them to work on.
4. Purchase R&P, Master install kit, all the required tools. Then hit the books to find the proper procedure and measurements for that axle.

Good Luck.

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1 Answer

Want to know if i can put a differential from a 2007 tahoe on mi 2003 denali xl mine is lock


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Rear end (axle)


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2) Gear Ratio 3.31 or 3.73
3) Track Lock - yes/no

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