great years for Chevy Duramax Allison Crew 4WD

[MrIQR]

Rust will not be an issue in all states that receive snow, only the states that use salt. Here in Oregon no salt is used and rusty vehicles are basically unheard of unless someone brought it here from out of state.

IMO the LLY 04.5-05 is just as good as the LBZ without the price tag. Upgrade to a LBZ intake mouth piece and intake of your choice and they are good to go.

 

[Reg2view]

Lack of corrosion in the NW is amazing. LLY does have less cooling capacity stock.

 

[donbrown]

I also read the head gasket got thicker from 2005 to 207.5 to minimize a failure. 2 sizes of head gaskets were used.

I would do the LLY if it wasn't for the 3.3 gallons of less coolant.

 

[donbrown]

What is the opinion on a lifted truck?

Im thinking no because of the limitations pulling a GN or 5th wheel.

Im thinking lifted may catch wind pulling. We have been stopped pulling an enclosed trailer many times from high wind conditions.

Stock is 235/75-16 and a common 6" lifted has upwards of 35" tires.

Any benefit?

Better mileage? Then should 3.73 vs 4.11 gears be considered?

And ya still looking.

 

[Reg2view]

Lifted dmax beyond 2 inches will destroy the upper balls joints, and the CVs, without an aftermarket UCA and differential drop. FWIW.

 

[AndrettiDog]

I tossed around a smaller lift (say 4" or so) or level kit. I have young kids and didn't really want a lifted truck because I also pull a 5th wheel. So I leveled mine instead. But don't just crank the torsion bars. You are stretching out the suspension. The ride will be terrible and you will go through ball joints quickly. I did a Cognito UCA kit with Bilstein's, HD ball joints, tie road ends, Pitman and idler arms, etc. Rides as well if not better than stock.