93 Ranger clunks/slips while accelerating in 4wd

[Obstaclees]

Hello,

I did a search and couldn't find a specific answer to this question so sorry if this has already been answered.

Anyway... what's happening is when 4x4 is engaged I get a random clunking sound coming from the front of the truck while accelerating. It feels like something is slipping. It will happen multiple times as I accelerate and as far as I can tell it isn't doing this while the truck shifts. I tested it climbing up a fairly steep rock surface which made the clunk far worse.

Anyone know what that would be? The 4x4 and Ranger is new to me so i'm not very knowledgeable yet.

Truck is a 93 Ranger XLT, 3.0, Auto

Thanks for your help!
Mike

 

[martin]

Auto or manual hubs. Sounds like work cams on auto hubs.

 

[Obstaclees]

Hey martin,

They are auto locking.

i've been suspecting the U joints the more i research but can't visibly see anything wrong with them though.

I drove the truck slowly (no faster than 10km/hr) around the yard in 4wd to analyze the symptoms again and it seemed to be worse while turning but still happened while driving strait.