Unless this truck has been neglected, it is unlikely something sinister. So when you're under the truck with the wheels chocked and the transfer case in neutral, it is normal to see more rotational play in the front than the rear when you're rotating drive shafts by hand. The front will have more slop than the rear as there are more interfaces. Make sure there is no play in the 4 universal joints.įront drive flanges can be an issue on the older trucks if neglected, but I have changed mine along with outer shafts and it made no difference. Make sure there is no axial or lateral play in the 2 drive shaft slip yolks. That being said, I will repeat what was previously stated. It is a 27 year old truck, not a modern sports sedan. Thanks, Bob Nancarrow are probably 100+ posts on "driveline clunk" relating to US spec FJ80s.Īs stated above, some driveline slop is normal and you will have to live with that. Maybe even a savvy DIY tech from IH8MUD is within driving distance and could use a project and some income? I love this vehicle and want to keep it but I've grown tired and worried about the clunk. Can I get some advice, either about the possibility of the slop in the rear diff being the cause or maybe even a competent technician within a couple hundred miles of me? I live in the metro Detroit area. I'd love it if someone near me knew enough to diagnose and repair the issue but the dealership can't even tune the 80 up and I have no confidence in any of the local shops to know much more about this old vehicle.
I'm also getting older and making repairs is not as easy as it used to be. If I knew for sure it was the rear diff I might spend the money to replace the whole thing but I'm not sure and I'm getting tired of fixing the wrong thing.
There is apparent slop in the driveshaft going into the rear diff, no apparent slop in any of the u-joints (which I've also lubed). I can't make out exactly where the clunk is but it seems like in the mid or rear area of the drivetrain. It always clunks when shifting from drive to reverse and reverse to drive and it has a clunk most times when letting off the gas or putting on the gas at slower speeds. After reading posts on this site I've tried several cures, like lubing the splined shaft, new lube in the front and rear diffs, nothing seemed to work. My 1991 Land Cruiser (180K miles) has had a driveline clunk since before I bought it 6 years ago.
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