Help with wierd acceleration clunk!!!!

[thammel]

I bought a used 2002 4x4 with 4.0 V6 and 43000 miles 2 weeks ago. I've experienced a clunk or miss on hard acceleration a few times. This is not always present. I've got a 3 month warranty on the used car and want to figure out what it is. I don't think it's a miss. First noticed going up a hill on a downshift. Feels like a clunking kind of a miss sound. It felt like a clunk clunk clunk thing about 6 times in a row spaced about a second or less apart. This has happened more than once. This car is a lot more complex than my Bronco II with manual trans and manual hubs!! My worries are something screwy with the auto trans or 4 wheel drive system. Is there any way to really turn off this 4 wheel system to aid in diagnosis?

ANYONE ELSE HAVE ANY PROBLEMS LIKE THIS?????

How can I get TSB info on line?

Glad to join this forum!!!!

Thanks,
Tom

 

[Blee1099]

I bought a used 2002 4x4 with 4.0 V6 and 43000 miles 2 weeks ago. I've experienced a clunk or miss on hard acceleration a few times. This is not always present. I've got a 3 month warranty on the used car and want to figure out what it is. I don't think it's a miss. First noticed going up a hill on a downshift. Feels like a clunking kind of a miss sound. It felt like a clunk clunk clunk thing about 6 times in a row spaced about a second or less apart. This has happened more than once. This car is a lot more complex than my Bronco II with manual trans and manual hubs!! My worries are something screwy with the auto trans or 4 wheel drive system. Is there any way to really turn off this 4 wheel system to aid in diagnosis?

ANYONE ELSE HAVE ANY PROBLEMS LIKE THIS?????

How can I get TSB info on line?

Glad to join this forum!!!!

Thanks,
Tom

It could be a number of things, it could be your carrier bearing in your slip yoke needs to be greased, maybe you have a bad u joint, etc.. Its really difficult to diagnose something without experiencing it first hand.

 

[Rhett]

I second what Ben said, could well be u-joints or slip yoke on the drive shaft that need lubing or replacing. I'd start by lubing the slip yoke, it's easy and cheap to do. I assume your 2002 driveaxle has a slip yoke...