Odd Tire Wear...have a look

[dirtyoldman]

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

 

[PenguinLTZ]

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

 

[dirtyoldman]

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

 

[nubuilder]

A little too much Toe-in

Also, these trucks are known for loosing alignment VERY easily. And yeah, the toe in is kinda crazy.

Yep, 400s need checked with more frequency. I would definitely do it with any new set of tires.

Why are the 400's so bad? Is there a design flaw or something? Why don't the 800's & 900's have the same problem?

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

I guess I can see some point in the weight factor, but I don't get how the parts themselves have an effect. All my parts are just as tight and pressed in place as yours are.

Maybe I'll just have to find a K2500 ECSB and do a frame swap.

 

[Bernie]

That's very common tire wear on a GMT400 truck. You can minimize it by running a little more air in the fronts. The geometry in the front end of those trucks always wore tires on the edges from cornering.

Listen to the man, he knows of what he speaks. I've seen that same kind of wear on almost every GMT400 I've looked at.

When cornering with these trucks the geometry of the front end causes excessive positive camber, and the outer edge of the tire on the outside wheel tends to roll under. The wear is worse, IMHO, if you do a lot of driving on concrete vs asphalt.

 

[dirtyoldman]

A little too much Toe-in

Also, these trucks are known for loosing alignment VERY easily. And yeah, the toe in is kinda crazy.

Yep, 400s need checked with more frequency. I would definitely do it with any new set of tires.

Why are the 400's so bad? Is there a design flaw or something? Why don't the 800's & 900's have the same problem?

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

I guess I can see some point in the weight factor, but I don't get how the parts themselves have an effect. All my parts are just as tight and pressed in place as yours are.

Maybe I'll just have to find a K2500 ECSB and do a frame swap.

I think we're blowing this prob all out of proportion....an alignment & correct air pressure in all the tires will fix this Ask the tech if the toe in was a little more than spec.

BTW,I run all my tires on all my vehicles 5lbs. less than what the tire mfgrs. have imprinted on the tires.

 

[nubuilder]

A little too much Toe-in

Also, these trucks are known for loosing alignment VERY easily. And yeah, the toe in is kinda crazy.

Yep, 400s need checked with more frequency. I would definitely do it with any new set of tires.

Why are the 400's so bad? Is there a design flaw or something? Why don't the 800's & 900's have the same problem?

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

I guess I can see some point in the weight factor, but I don't get how the parts themselves have an effect. All my parts are just as tight and pressed in place as yours are.

Maybe I'll just have to find a K2500 ECSB and do a frame swap.

I think we're blowing this prob all out of proportion....an alignment & correct air pressure in all the tires will fix this Ask the tech if the toe in was a little more than spec.

BTW,I run all my tires on all my vehicles 5lbs. less than what the tire mfgrs. have imprinted on the tires.

I'm not blowing it of proportion. I was somewhat serious about finding another frame, but just don't feel like going through all the research to find one!

 

[Wyley87]

A little too much Toe-in

Also, these trucks are known for loosing alignment VERY easily. And yeah, the toe in is kinda crazy.

Yep, 400s need checked with more frequency. I would definitely do it with any new set of tires.

Why are the 400's so bad? Is there a design flaw or something? Why don't the 800's & 900's have the same problem?

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

I guess I can see some point in the weight factor, but I don't get how the parts themselves have an effect. All my parts are just as tight and pressed in place as yours are.

Maybe I'll just have to find a K2500 ECSB and do a frame swap.

I think we're blowing this prob all out of proportion....an alignment & correct air pressure in all the tires will fix this Ask the tech if the toe in was a little more than spec.

BTW,I run all my tires on all my vehicles 5lbs. less than what the tire mfgrs. have imprinted on the tires.

so i sould run 45lbs instead of 35lbs?

 

[OPGMC]

My son runs 45 in his 400. 245/75r16 E A/T's

I always run 35 but it rides good and tracks so straight I don't mess with it.

 

[dirtyoldman]

A little too much Toe-in

Also, these trucks are known for loosing alignment VERY easily. And yeah, the toe in is kinda crazy.

Yep, 400s need checked with more frequency. I would definitely do it with any new set of tires.

Why are the 400's so bad? Is there a design flaw or something? Why don't the 800's & 900's have the same problem?

Watch how it drives after the alignment..your truck should go straight down the road when you let go of the wheel(hopefully you can find a decent flat road),when it starts doing something different start checking things.Even my Burb with them big assed KM2s goes straight,with or without the toy hauler in tow...I figure all is fine and the tires have even wear so far

I beleive that! My 3/4 ton 400s seemed to hold an alignment better than my 1/2 ton 400s did. My little 2 door Tahoe was the worst.

Smaller tie rods,ball joints,upper & lower A arms and overall lighter weight parts could have an effect on the alignment longevity.I've taken my Burb off-road a good bit and hit some pretty deep ruts,berms,rocks,etc. and nothing changes...that's why I'll always have a 3/4t. truck,I like the confidence that extra strength gives me

I guess I can see some point in the weight factor, but I don't get how the parts themselves have an effect. All my parts are just as tight and pressed in place as yours are.

Maybe I'll just have to find a K2500 ECSB and do a frame swap.

I think we're blowing this prob all out of proportion....an alignment & correct air pressure in all the tires will fix this Ask the tech if the toe in was a little more than spec.

BTW,I run all my tires on all my vehicles 5lbs. less than what the tire mfgrs. have imprinted on the tires.

so i sould run 45lbs instead of 35lbs?

Look on your tires,it's there.But it will say Max pressure,I'd run 'em 5 under.