YJ Tire pressure?

Question

My wife is the proud new owner of a 4-banger 93 Wrangler. It's in grood shape, was well cared for and garaged. It has a sailcloth top, nerf bars and 31" tires wrapped around some AR outlaws. It has some heavy duty looking shackles on it but no real lift.

The tires say 50 psi. That seems a bit much for a lite Jeep. We didn't get any owners manual, but I was thinking somewhere around 35 psi, but...

The thing drives kinda squirrelly. It's real touchy about steering. Which makes me think maybe, perhaps the tires should be inflated to a higher psi, but I'm not sure. Maybe it needs a front end alignment.

Any thoughts? TIA

Jeepers · Accepted Answer

Thanks Jerry.... WOW! My posts are showing up! WooHoo!, ahem...What about the squirrellyness, any ideas? My CJs were never that way.

Jerry Bransford · Answer

How's your front-end alignment? Like toe-in? Has anyone installed a lift on the Jeep that might have decreased the Caster angle below 5 degrees? A quick front-end alignment will tell you. If the Caster angle is less than about five degrees, that could cause "squirreliness". Toe-in should be 0 to -.15 degrees though .15 works best.

Jerry

Jeepers · Answer

Alignment will be checked tomorrow. No lift other than the shackles.

Jeepers · Answer

Two CJs and a Cherokee. They both behaved well.Right now her tires are at 32 psi. AN alignment is scheduled.

Gerald G. McGeorge · Answer

If this YJ has longer shackles installed to allow the 31's then it's mostlikely the front caster is off by a mile. If you want to leave the 31s thenit'll probably take shimming the front axle to get the caster back to the5-7 degrees necessary.

Jeepers · Answer

The YJ requires a lift for 31s?

mabar · Answer

32 lbs may still be a little high for a YJ with 31" tires. I have an '02 TJthat came with 30" tires. Factory recommended pressure on the door stickeris 29 lbs. for 30" tires. I now have 31" BFG AT tires and run 28 lbs. onfront and rear, which seems perfect for this size.Tom

Mike Romain · Answer

When I ran 31's on my CJ7, I ran 28 for the highway and 26 around town.

That mellows the handling out.

They also finally wore out with an even tread all across.

I would be all over the road at 35 psi, not to mention the kidney belt needed to drive it with tires that hard.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Jeepers wrote:

Mike Romain · Answer

There you go....You will likely need to add shims to the front axle to get the Casterback.Shackle lifts are the 'worst' thing to use, it knocks the front and rearalignment all to crap.  If the rear is off too much it will jut eatu-joints...Mike86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '0088 Cherokee 235 BFG AT's

Mike Romain · Answer

Yup.Mike86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '0088 Cherokee 235 BFG AT's

YJ Tire pressure?

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