Jeep gallops down the road

M384X4 · Post by **M384X4** » Sun Jun 08, 2014 9:17 am

The jeep, M38, travels like the tires are oval?!! Especially at low speeds? All the tires are new from AJP. Granted the rims are old and needed a lot of lead to balance. Do you think its the rims? Hate to buy new if it turns out to be something else like rear bearings? front bearing are all new. I can't get any loose movement from the rear tires when it is on jacks. Axle bearings?
What should I go after first?

Post by **wesk** » Sun Jun 08, 2014 9:32 am

Are you using "Gallops" to describe a wheel hop (vertical) motion of the tires or a wobble (sideways shake)(also moves steering wheel back and forth)?

Is it on smooth or rough surface road?

At what speeds and what intensity?

Are the tire's sidewall plies nylon or polyester reinforced?

M384X4 · Post by **M384X4** » Wed Jun 11, 2014 2:25 pm

up and down motion on a very flat road. Not as noticeable at higher speeds.
7:00 x 16 Cross Country Tire NDCC 6 ply rated

OKCM38CDN · Post by **OKCM38CDN** » Wed Jun 11, 2014 3:43 pm

One question, have you put tubes in the tires or are you running them as tubeless tires...

Reason I as is that I was instructed by my dad (ran a gas station back in the 50s and 60s) to sprinkle baby powder in the tires before installing the tubes, then partially inflate the tubes, bounce them hard on the ground, deflate bounce them again... do this a couple of times to get the tubes to settle into the tire evenly; when completed pressurize to operating pressure...

Reason for the baby powder is it allows the tubes to move inside the tire and settle...

Hope this helps...

Post by **wesk** » Wed Jun 11, 2014 11:17 pm

You can buy the correct tire talc to use that contains silicon. Baby powder is ok but does not contain silicon.

buzzk · Post by **buzzk** » Thu Jun 12, 2014 8:51 am

If the tires have been sitting for a long,long time they will have flat spots and takes time to work them out buzz

Post by **wesk** » Thu Jun 12, 2014 9:48 am

Are the tire's sidewall plies nylon or polyester reinforced?

You didn't answer this question but you did ID the brand & size of the tire. If the tire is nylon and 4 ply (reads 6 Ply Rated) then you have 2 ply nylon sidewalls and the tire will take a set (flat spot so to speak) in a week or two of sitting that will take a few hours of driving to beat out of the sidewall. This will result in wheel hop or vertical bouncing.

RICKG · Post by **RICKG** » Thu Jun 12, 2014 10:13 am

When running Cooper NDCC nylon 6 ply rating tires on my M38 they would
develop the "flat spot" after a week and would take miles to round out,
especially in cold weather. Never did like them.

Post by **wesk** » Thu Jun 12, 2014 10:33 am

In the 40's through the 50's it was the most popular reinforcing material for tire sidewalls but by the 60's Polyesters won the battle and have been the leader along with kevlar ever since. Repop tire makers want to give you all the feel of the old style nylon tire so they use nylon and you learn the hard way there's nothing wrong with your suspension.

RICKG · Post by **RICKG** » Thu Jun 12, 2014 10:47 am

The STA Super Traxions I'm running now are 4ply nylon cord @ both
tread and sidewall and display none of the annoying characteristics
of the NDCC's I was running before.

Post by **wesk** » Thu Jun 12, 2014 11:03 am

Rick,
There's something else in that tire providing support and memory loss for that nylon.

RICKG · Post by **RICKG** » Thu Jun 12, 2014 11:07 am

The only visible difference, besides tread pattern,
that I can see is the rubber compound softness.
The NDCC's were hard as a rock, the Super Traxions are
much softer.

Post by **wesk** » Thu Jun 12, 2014 11:09 am

Bias/Radial, tube/tubeless, size?

RICKG · Post by **RICKG** » Thu Jun 12, 2014 11:25 am

wesk wrote:Bias/Radial, tube/tubeless, size?

This info off the tire:
Tube type, 6.50-16 LT.
4 ply nylon tread
4 ply nylon sidewall
6 ply rating
Load range C

Bias ply per their website. I'm not finding any other
construction or mfg info on the link..
http://www.stausaonline.com/product-cat ... uck-tires/

Jeep gallops down the road

Jeep gallops down the road

galloping