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Discussion Starter · #1 ·
I've been having some trouble with my D80 differential lately, and it seems to have started when I put my '99 Z71 into 4WD for a few minutes, which I do every few months just to keep things moving.

I thought that doing so involved only the front axle and the transfer case, but I'm beginning to wonder if 4WD mode also changes the state of the rear axle in some way.

Can you enlighten me on this?
 

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2017 Silverado LTZ Z71
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It changes the power distribution by about 30%. That 30% goes to the front
 

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2021 GMC Sierra Denali CC 4WD Ultimate 6.2L
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Don'drive in 4wd on a hard surface as that will cause binding of the drive line. Use of 4HI or 4LO and 4HI Lock or 4LO Lock on Full-time 4WD is intended for use on a low traction surface such as snow, ice, mud or sand. On a low traction surface, the differences in front and rear axle speeds will not have as much effect on binding because of the lower traction levels between the surface and the contact patch of the tires. On a high traction surface, the higher traction levels will create more binding and noise in the driveline.

TIRES
Tire rolling rates can be a major factor in operational characteristics of 4wd vehicles. Consider the following important items:

• All tires are the same size and brand. Tires of different brands may have different circumferences (or radius) even if they are the same size.

• Tires are set to factory recommended pressures. A tire with low air pressure will roll at a different rate.

• All tires have approximately equal amounts of wear. Tires with different amounts of wear will roll at different rates.

• All tires are the same tread type. Don't mix on-off road, all-season or street tires on the same truck as they may have different circumferences and roll at different rates.
 

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Discussion Starter · #7 ·
Z15 said:
Don'drive in 4wd on a hard surface as that will cause binding of the drive line. Use of 4HI or 4LO and 4HI Lock or 4LO Lock on Full-time 4WD is intended for use on a low traction surface such as snow, ice, mud or sand. On a low traction surface, the differences in front and rear axle speeds will not have as much effect on binding because of the lower traction levels between the surface and the contact patch of the tires. On a high traction surface, the higher traction levels will create more binding and noise in the driveline.

TIRES
Tire rolling rates can be a major factor in operational characteristics of 4wd vehicles. Consider the following important items:

• All tires are the same size and brand. Tires of different brands may have different circumferences (or radius) even if they are the same size.

• Tires are set to factory recommended pressures. A tire with low air pressure will roll at a different rate.

• All tires have approximately equal amounts of wear. Tires with different amounts of wear will roll at different rates.

• All tires are the same tread type. Don't mix on-off road, all-season or street tires on the same truck as they may have different circumferences and roll at different rates.
Appreciate the information, Mike!
 
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