Grind/Grab feeling on take-off (getrag)

[JGrefenstette]

when i pull away from a stop in 2nd, i feel a type of grinding or grabbing feeling that is only for the first 2-3 seconds, but it feels like somthing is binding or pinching. the rotors and pads are fresh, and it has done this before and after the brake job.



could it be u-joints??



it only does it at take-off, shifting though the other gears at speed, it doesnt do it.



my dad mentioned that he read somthing about a pilot bearing in the cluch wearing out and 'nibbling' its way around untill it fell into place. does this sound like that is the problem here????????

 

[PToombs]

It might also be the throwout bearing. does it make any noises?

 

[JGrefenstette]

yea i does



it sounds like a knock/grind.

wouldnt the throwout bearing affect shifting through all gears though?

 

[DieselBuzz]

When my throwout bearing went it made noise whenever I used the clutch. Jack the whole rear and go over the u joints closely, especially the center one.
I just had the center bearing go on my getrag (a long story) and it made noises in 2nd and 3rd but not in 4th. Check if you transmission oil is low too. Hope it's only minor.

 

[1stgen4evr]

Pull the side covers and look real good. Also examine the magnet. Sounds like the front cluster bearing going south. There are previous post on all this. Check the archives. If the problem is in the getrag, you will know quite $oon.



Basicly, never run the getrag when it makes noise. Expecially in the fwd trucks, it will destroy itself in terms of a reasonable rebuild cost if run long making noise.



James

 

[JGrefenstette]

well, i am now thinking and hoping that its the center position U-joint. we'll replace that in the next few days and see if that takes care of it.

 

[steveinaz]

Sounds as if the right side e-brake cable has seized. I discovered mine with a little help from a infrared temp gun. Seems to be fairly common problem. I think the cable is bent too tightly against the axle tube. I left that clamp off when I replaced mine. SteveinAZ

 

[1stgen4evr]

we'll replace that in the next few days and see if that takes care of it.





If it IS in the Getrag, you don't have a few days to 'see'. Best luck with whatever it is.



James

 

[JGrefenstette]

if the getrag goes that quickly, i cant believe that this coming from the getrag then. because its done this sence i got the truck 2 weeks ago. ive put about 500 miles on it. anywhere from crusing at 60-70 to puttin around town. it is worse when im on any kind of grade starting out, or starting out from a sharp turn, wich i guess should be expected since that adds to the stress on every moving part. also, i reverse, the truck kinda surges, dont know if that an accurate discription, but its definantly not smooth, and this is with the clutch totally ingaged, foot off the pedal. dosent this seem to lean more toward the u-joint? i would love any thoughts / ideas / experience / etc.

 

[1stgen4evr]

Sounds like the limited slip clutches in the differential.



James

 

[JGrefenstette]

james, dont take this the wrong way, but i really hope your wrong. i dont know how dificult and expensive that is to replace, but it dosnt sound pretty. as soon as i get the u-joint replaced ill let you know if it made any difference. Lord willing it will make all the difference and the problem will be solved. lets hope thats the outcome.

 

[1stgen4evr]

You would really have to work at it to hurt my feelings on this stuff.



I can tell you that I have worked on all the things I comment on and even at that, the best I can do is guess because these things will throw you a curve. Two years ago I changed a transmission, a front joint (which WAS bad) and then the entire rear axle when I discovered that the carrier was bad. The dana 70 is less expensive than a Getrag rebuild.



I do hope yours is simple. And worse case, the repairs are less than new payments.



James

 

[JLEONARD]

You would really have to work at it to hurt my feelings on this stuff

You know this pretty much says it all for most of us first genners. :-laf

I wonder why that is? Maybe we just been under the beast so many times that it numbed our souls and thickened our skulls??

Or maybe that's why we are first genners??



What came first... . the chicken or the egg? And don't say the one who light up first. :-laf :-laf That's an old one.

 

[1stgen4evr]

the chicken or the egg?



If you are unbending on creationism, the chicken.



In a pure evolution manner, whatever it is we now call a chicken was the result of a union of a male and female 'near chicken' that would not fit our precise current definition of a chicken, thus the egg which hatched into our chicken.



Similarly, we know that there was actually a Dodge truck, long before there was a Dodge/Cummins Turbo Diesel. No one considers the pre cummins first gen look sorta like trucks to be a real first gen till it is infused with a Cummins turbo diesel.



Hot dang am I on a roll.



James

 

[MMiller]

I see Philip has not been in this discussion yet. You have a club cab 4X4. Is there a spacer between the carrier bearing and where is mounts? There was a TIB about this on the clucb cab 4x4's. I cannot remember how thick it is. If its only on take off, then I'd look into that.



We're all here to help, and can only do so much without feeling or driving your truck. And like said above, you aren't going to hurt our feelings.



I'll go get Philip and drag him in here.



Michael

 

[Philip]

Yea I came kicking and screaming all the way Michael.



The TSB says to add a 1/2" spacer between the carrier bearing and its mount. This is for trucks with 6" lift blocks.



I would start with 1/4" first is the problem improves then try another 1/4" spacer. It didn't take all my launch shudder away. But it got a lot of it.

 

[JGrefenstette]

So for this spacer i can use anything i assume? id probly cut and drill out a piece of 1/4 in. steel. i assume that it goes between the carrier barring mount and where it bolts to the frame?

 

[Philip]

Flat stock will work good. Thats what I used.



For a test you could use flat washers. If it helps then do the flat stock.

 

[hotram03]

I would drop the inspection plate and look at the pos unit, check the in and out on the carrier bearings, by pulling in-out on the wheel while its jacked up, etc, mine had to have the works, done it myself, not too hard to do, my clutches were ok in the posi, about the only thing, after all that I stuck a Mag-Hytec on it, I liked the magnetic dipstick to check for shavings and the extra fluid. Mine was actually outer axle bearings, grinding when turning left with a trailer, wouldn't do it when it I didn't have the trailer on it, throw out bearing will be noisy all the time, u-joint sounds like change jingling in your pocket when really bad, along with the jerk and snatch when go forward and reverse, I would investigate the rear myself, hope this helps ya, I'm just a rookie wrench turner but I like working on them.

 

[JGrefenstette]

thanks hotram, im a real rookie at it, and your ideas are very helpful. i appreciate the description of the diferent semptoms for different part failures. that is probly one of the most helpfull things ive read on this thread, because im such a rookie (this is my 1st truck - im only 17 - ) i really dont know what to look for, and dont know what is abnormal with my truck. thanks for your practical help.



jimmy