poping in 4 wheel drive

[4x4RangerGuy]

well last night i pulled a wrangeler out of a lake bank so i had a good chance to really pay attention to my 4x4 noise. it sounds like a tail gate slamming down!

i think there is a little slippage somewhere but the front end is pulling, i had the mud on my face to proove it cause i was staring at my front tires!!!

Wicked sludge: you're the man, your truck rocks, i hope i can get some pics of mine up one day if i ever get a camra, old one died.

As I stated before, your hubs are slipping and failing to firmly engage the axleshaft. This often happens because there is a vacuum leak, which does not allow the hubs to engage completely, or the hub itself is wasted. I have had this problem before, and I have fixed many of my friends 98-00 4x4s with this problem.

Check your vacuum lines, and check the black hub disconnect by taking it off.

 

[Bent Bolt]

I've seen a few reports in the past about t-case chain slippage in some '98-'00 or so T-cases. If a set of hubs doesn't fix the issue, then the t-case might be the next thing to look at.

Yes and I have personally seen it in a few Sportrac's as well. Guy bought it at an auction and brought it to us to diag the very violent and loud banging when in 4x4.

 

[dougs3.0L98]

hey thanks 4x4rangerguy. sorry i forgot to mention that my hubs have been locked for about 2 years now, i did the mod to perm. lock them b/c of course the pulse vacum system failed. i'll check out the hubs when i get time. however i must confess i'm thinking about just trading this truck in on something with a little more power and a little less miles.

 

[77'cj7]

Doug, my 98 used to do the same thing. I believe it was probably a hub issue, as the hubs were quite rusty. However, I replaced the hubs with manuals at the same time i put in a 1354M t-case so possibility of a t-case issue. T-case is unlikely culprit in my situation though, as the case had been recently rebuilt, due to a stretched chain (damn electric shift would finally decide to engage when i had given up getting it into 4x4, and was trying to throttle it out in 2wd)

 

[dougs3.0L98]

solved!

it was just the ball joint deal in the front drive shaft, guess i'm looking for a new shaft now.

 

[soylent_green]

Someone mentioned t-case chain slippage. Is this a common failure?

'00 4.0 5-speed

 

[b_aldredeg]

Someone mentioned t-case chain slippage. Is this a common failure?

'00 4.0 5-speed

it was on mine 4x4 high was fine when i went to low it made all kinds of noise went to the juck yard and got one for 400.00 put it in and fixed the prob. i know what tour my old one up my buddies would get stuck and i would have to pull them out thats what got it.

 

[soylent_green]

when at an idle in 1st gear low range, mine starts out smooth, but sometimes starts bucking like theres slack in the driveline. I also sometimes hear a loud PING sound when going from foreward to reverse or vice versa. Does it sound to you like we have the same problem?