Daniel_swe

Hey guys.

I have a problem with my 4.6L -98, it started some time after I changed the rear U-joint. When driving from a standstill there is a big clunk coming from the rear as soon as i touch the throttle, if i just sneak away I can mostly avoid it. It won't come straight away only when throttle is applied, and as it rolls fine with the drive in, I assume it's not the drum brakes.

Any ideas?

2000xl_toronto

could be the front u-joint? I replaced my rear without thinking about the front one and then two months later my front one started to go.

Daniel_swe

I checked it, seems fine. Anyone have any ideas? Could it be the drum brakes after all, and in that case what do I look for?

Thanks.

BJV269SS

I realize Chevy is a different brand but I thought I'd mention it anyway. I also have a 98 1500 4x4 pick-up. When it was new it had a clunk after I stopped at a light and when I started from a light. It was definitely the rear end because I could feel it in the seat of my pants. I went to the dealer with it and they told me there was a problem with the gear lube in the diff and the transferees case. They changed the fluid, had to do it twice, the first time lessened it the second cured it. It's probably not the problem in your case but I thought I'd mention it.

Daniel_swe

Thanks for the info man, couldn't hurt to change the fluid anyways. =)

Kattumaram

....don't think the U-joint has anything to do with the "clunk". Investigate the rear suspension for any obvious loose or broken parts that may shift when drive torque is applied and the axle tends to wrap around.

BTW: I'll bet you are paying a hefty fee to get that 4.6L on the road there in Sweden....what? a couple of thousand euros? A friend in your neighboring Finland, Pori, got stung 6000 euros to qualify a 92 Lincoln Town Car for the road....hopefully Sweden does not have such Draconian regulations.

Soby

I had a 99 ranger that made a clunk when taking off.Ended up that the slip yoke on the rear shaft had teflon coated splines and would stick under a load as the axle wrapped up you could feel it in the cab felt like the rear diff was going out of it.. The fix was to pull the yoke apart and grease the splines.It lasted for about a year then had to redo it.Not sure what yokes were ran on the full size trucks that year but might be worth a try.