Chevy & GMC Vans

I noticed it three times today when I made the hour long trip to my mom's place.

going around a corner i slowed, started the turn letting the van roll around it, then as i pressed on the gas pedal there was a slight split second delay then a clunk then away it went.

sound like u joints? or a tranny issue?

it did it a couple more times when slowing, then coasting, then pressing on the gas to go.

these were all at slow speeds. when coasting on the hwy.. then pressing the gas it wasn't noticable.

thanks

Sounds like u-joints to me.

It sounds like u-joints to me as well at least that is what I would check first.

crash wrote:I noticed it three times today when I made the hour long trip to my mom's place.

going around a corner i slowed, started the turn letting the van roll around it, then as i pressed on the gas pedal there was a slight split second delay then a clunk then away it went.

sound like u joints? or a tranny issue?

it did it a couple more times when slowing, then coasting, then pressing on the gas to go.

these were all at slow speeds. when coasting on the hwy.. then pressing the gas it wasn't noticable.

thanks

Other than U-joints, which is a good idea, I'd check the that the fluid is full, and that the driveshaft isn't binding in the tailshaft due to a worn bushing of the splines getting dry. I have had both of the latter cause a weird clunk or delay, almost like it slipped for a split second.

rlsllc wrote:I'd check the that the fluid is full, and that the driveshaft isn't binding in the tailshaft due to a worn bushing of the splines getting dry. I have had both of the latter cause a weird clunk or delay, almost like it slipped for a split second.

by fluid.. would you mean trans or rear diff?

Its not awd right?

check your front brake calipers as well. One of my jeeps did exactly that due to a sticking caliper.

crash wrote:

rlsllc wrote:I'd check the that the fluid is full, and that the driveshaft isn't binding in the tailshaft due to a worn bushing of the splines getting dry. I have had both of the latter cause a weird clunk or delay, almost like it slipped for a split second.

by fluid.. would you mean trans or rear diff?

Trans..sorry

not AWD

and I'll check the trans fluid this am when I get into work

and the clunk really felt more in the rear than the front.. (only have calipers on front)

yesterday, drove around about 40min. didn't do it at all :-k


one thing i've heard mentioned before is something about a sticking solenoid or valve in the trans.. i hope it does it again so i can tell if it's a random clunk or if it did it while shifting from first to second. i don't remember

tranny fluid is clean and full

another thing I noticed twice while backing into my spot at work. going from D to R there is a second or two delay before engaging into R. that'd be the ujoints... correct?

another way to check for sure would be to slide under the van and try and rotate the drive shaft by hand and see if any play ? :-k

If it was damp out, you could simply have brake dust buildup in the drums. I have had rear drum brakes grab and release when you take off.

A second or 2 delay between R and D wouldn't be u-joints.

Is this the 99 or 93? The 99's trans is built in with a delay between R and D or it could be time for a fresh filter and fluid in the trans.

sorry, it's the 99

the fluid does seem like it's getting a little transparent.. but clean and not burned smelling

Crash I think it is time to crawl under it and eliminate the u-joints.

This is really out there, but a big pause or clunk could be something in the rear axle (spider gears, bearings, etc) but I'd think that there would be other noise.
I'm really suspect of the U-joints, drivshaft splines, maybe the slip yoke is failing?

It could just plain be the trans, lets hope not.

I wish I was there to help put a finger on it.

well the 99 isn't being driven today. i hope to have time to check out the joints tonight when i get home from work

thanks for all the input guys