Getting spare parts - front differential, transfer case and rear end

Found a guy with a parts car, he got front diff for $250, transfer case for $300, rear end for $300. The donor vehicle is 2007 Denali with 143K miles.

I have two Yukons. 2007 GMC Yukon Denali and 2013 GMC Yukon Denali XL, both with almost 200K miles.

I wnat to keep both of them going, especially the 2013 one as it has a newer engine with lower miles on it. And 200K miles is territory when anything can fail on either one, anytime.

Question, are these good parts to keep both of these going? Meaning what is the next thing to fail on either Yukon? I want to repair-proof both of them in the sense that if something breaks, I have the parts to fix it. Especially given that 2007 and 2013 take the same parts as far as I understand (correct me if I am wrong).

Are these good prices? I will be paying $850 for all 3 and picking it up myself, the parts are 2 hours away.

There are improvements to the transmission between the 2007 and 2013 but the older transmissions can be updated to the newer style. There were also some improvements to the transfer cases on the 4x4s but do not know if that applies to your AWD transfer cases. Either way, I would imagine that these too can be updated to the latest improvements if necessary.

Are any of your Denalis RWD? If so, they will have the larger 14-bolt axle out back and not the 8.6 10-bolt used on the AWD trucks.

I like having spares for my fleet. I can overhaul the components at my leisure and have them ready for that rainy day.

The prices seem like core prices in my area. Are you expecting these things to be serviceable and or rebuildable? If so, then I'd say you're doing good.

No, they are all AWD. I thought all GMC Yukon with the Denali package was AWD by default.

dictum said:

No, they are all AWD. I thought all GMC Yukon with the Denali package was AWD by default.

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No, only in 2007 was it only AWD.

Hehehe, and 08 was AWD only.

Yes, having those parts in a pile is gold with two 200k Denali.

The next part on the horizon is a L96 6.0L gas motor from a 2500 / 3500 Burb or truck. It’s a regular gas 380hp + e85 that drops in both trucks. If you add a cam before installing it you’ll get a 400hp+ torque monster for towing. The 2013 would need the AFM turned off.

As far as transmissions go, the 8 & 10speed conversations are starting to slowly become available….


It boggles the mind to think what a Denal would be like with a 6.2L & 10SP. More life on the motor & a 30% jump in milage.

I have had a Silverado with a 6.0L, I like 6.2L more.

At what mileage does either front or rear diff fail? What about the transfer case?

dictum said:

I have had a Silverado with a 6.0L, I like 6.2L more.

At what mileage does either front or rear diff fail? What about the transfer case?

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The AWD places less strain on the rear differential than the part time 4WD rigs do, so they tend to last longer. I just turned over 247K on my '07 XL Denali and it has the original front and rear diffs and transfer case. The transfer case chain is the only part that needs attention right now due to slack in the chain, but it's still driving fine and I trust its reliability. The diffs are both fine and not leaking.

Gotta love the 247k club

So at what mileage do the above fail, typically?

dictum said:

So at what mileage do the above fail, typically?

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I really think a lot of the failure rate depends on the kind of life the vehicle lives. I have a 13 sierra with over 240,000 miles and engine, tran, diffs and transfer case all going strong. And my 14 Sierra same thing with 280,000 miles.