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Somethings wrong, still shuddering at takeoff.Getting worse (pages 1 2 all)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Espen88k5, Oct 8, 2001.

  1. Espen88k5

    Espen88k5 1/2 ton status

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    Hi
    I have a problem I need to find out whats going on. It's related to what started as a shrug at take off. Now I can feel it tugging and making a sharp rhytmic sound when going from a dead stop. (specially when doing a left turn, but also going straight..) After I get it rolling it will go away.It feels like something will snap if push it any harder. Every once in a while it will act normally, but lately it is doing it more and more regulary.

    What should I do? U-joints are new,I tried greasing the t-case yoke, nothing changed.Is it my rear 10 bolt about to go out on me ?. Should I just floor it and find out that way? Is there anything I can pull from the rear axle to inspect for damage?

    88 with 6,2 diesel, 3.08 and 35"

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  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Re: Somethings wrong, still shuddering at takeoff. Getting wors (pages 1 2 all)

    Does it feel like it's tranny-related? Or is it more of a brake/front end problem?



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  3. Espen88k5

    Espen88k5 1/2 ton status

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    Re: Somethings wrong, still shuddering at takeoff. Getting wors (pages 1 2 all)

    Could it be my first gear cluth? It feels more like something binds, lets go, binds, lets go,binds lets go... and the clunk it makes is felt from the rear, not through the steeringwheel or from the front.. how can I test the transmision for first gear problems?
    Oh yeah, the thumping will follow the tires turning faster and faster, not the engine rpm's increasing if that makes any sence. Also if I hear it starting to shudder I can take my foot of the gas pedal a litle and it will soften the shuddering. If I "baby it" going first I can avoid it.

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  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Re: Somethings wrong, still shuddering at takeoff. Getting wors (pages 1 2 all)

    It really sounds tranny related........I'm no tranny expert, BTW. Hopefully someone else can figure this out.

    I seem to remember smething like this happening to a truck at work. For some reason the torque converter comes to mind.....



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  5. Espen88k5

    Espen88k5 1/2 ton status

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    Re: Somethings wrong, still shuddering at takeoff. Getting wors (pages 1 2 all)

    tranny related...gulp[​IMG] It did run a litle hot over those mountain passages couple of weeks back. (Have tranny-temp reader installed.) How can I tell for sure, and if I got hold of another used tranny could I switch it out in my driveway like I do all other things?

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  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Re: Somethings wrong, still shuddering at takeoff. Getting wors (pages 1 2 all)

    COME ON TRANNY GUYS!!!!!! Help the brother out......



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  7. BIGRIG

    BIGRIG 1/2 ton status

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    Need some specs.....lift case, etc.! Could be ujoint binding, low on tranny fluid or tcase low, or axle low on fluid?



    MY DRINKING TEAM HAS A FOUR WHEELING PROBLEM![​IMG]
     
  8. Espen88k5

    Espen88k5 1/2 ton status

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    Lets see.. lifted 4" with blocks in the rear,
    700 transmision with overdrive, and a np 208 t-case. When I lifted it back in april I did not notice any vibrations, but some time during the summer it started doing this, and now it's worse than ever. All liquids are upp to spechs. Resealed my t-case,changed the output seal too. Removed cover on diffrential, no metal shavings and gear-teeths sharp and all there, filled to the fill plug with limited slip added gear oil.. New u-joints, the ears on the slip yoke was worn a litle, so the cups on the new u-joint could be finger-pressed into place, they wiggles a tiny bit, thinking of just spot-welding the cups still.
    Have thought about axle wrap too, but why would it be getting worse? crack in leaf maybe... I'l check tomorrow.
    Also I have addaleafs laying in the garage, I could try to stiffen the rear springs by innstalling these, but I'm worried something is about to snap..



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  9. BIGRIG

    BIGRIG 1/2 ton status

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    #1 did you drop the transfercase when you lifted it? Took me about three or four months before I got a vibration from not doing this.

    #1.5 check the tranny and motor mounts and make sure that they're not split or cracked.

    #2 may drop the pan on the tranny and check the filter

    #3 Is the rearend a posi? I don't know..but if you put limited slip in a posi it will shudder real bad.

    Always remember start with the cheapest and the easiest and work your way up. You don't want to switch out the tranny if you dont have to! not fun!

    But it definitly sounds like binding or tranny. Try a tranny shop? ask them....those 700's are real funny about stuff like this.

    good luck

    Chris

    MY DRINKING TEAM HAS A FOUR WHEELING PROBLEM![​IMG]
     
  10. RedDwarf

    RedDwarf 1/2 ton status

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    Start off by making sure the bellhousing bolts are tight. Also check the crossmember bolts and the t-case bolts. Also check the u-bolts. The lift mfgs tell you to re-tighten these after 500 miles or so.

    If that doesn't work, think about changing the u-joints.

    Hopefully, you will get it to stop before you have to tear into the tranny$$$.

    Still Poundin' "pavment" after all these years!!! [​IMG]
     
  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Re: Somethings wrong, still shuddering at takeoff.Getting worse (pages 1 2

    Get under it and pull off the inspection cover on the tranny. Check the flex plate for missing bolts to the converter and cracks in the flex plate. Some reason they are prone to cracking on the 700's. My bud has broke a couple in his work van. The van runs heavy and LOTS of stop and go stuff caused them to stress fracture. The extra torq from that Deisel may have taken it out.

    I don't need no damn shop manual, I got a pornographic memory.
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  12. K5Jimmy

    K5Jimmy 1/2 ton status

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    My 89 had this same prob for a few weeks....I expected the worst, but when I changed the tranny mount, it went away....tranny mount looked pretty ok from the ground, but when I removed it, I could see how the rubber bushing was toast....new one was like $29 or so......I like to try cheap and simple first........a bad motor mount will sometimes allow the engine to torque things out of alignment also.....I put Poly engine mounts in a few years ago, and forgot about it......good luck...JD

    Stuck?...Hell no..I still got some gas left..
     
  13. BIGRIG

    BIGRIG 1/2 ton status

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    Hey I also had to throw in that I liked the way YOU put (pages 1 2 all)......pretty slick! Hell it made me look!

    MY DRINKING TEAM HAS A FOUR WHEELING PROBLEM![​IMG]
     
  14. Espen88k5

    Espen88k5 1/2 ton status

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    [​IMG][​IMG][​IMG][​IMG] Sorry about that, things are just moving so darn fast around here these days, ya gotta get creative to be read by as many as posible..

    It was really cold this morning and for some reason it felt a litle tighter? Tranny-mount?

    About the the rear axle:
    When I spinn one wheel, the other goes the other way with them both hanging free in the air. If I change directions it goes bump and the other tire changes to. All the time with my t-case in neutral, the drive-axle does not rotate firm with the ring and pinion, but just slips behind at it's own paste.The glovebox says limited slip, So I used limited slip oil, but the diffriential cover had a original magnet in it, and one of the numbers on the ring was 87. What does a limited slip diffriential look like anyway? I got pictures of mine when I changed the oil.

    The conecting/suporting rod between the engine and the t-case was broken long time ago, I found it when I was resealing the 208. I welded that together and it's holding upp now. But there would have been extra stress on the driveline because of this right? How do I remove the inspection cover on the tranny? It's to the front towards the engine right, just a plate to keep mud out?

    Any help you guys can offer will be grately apriciated. I'l start checking on the tips I'v gotten so far. The tranny filter and oil are new by the way.
    Thanks

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  15. ftn96

    ftn96 1/2 ton status

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    The inspection cover is the large rounded aluminum thing "Directly" in front of the tranny pan. Its real easy to take off.
    As far as the limited slip oil in the rear, if its not a limited slip and you add the limited slip additive, it aint gonna hurt nothing but your wallet.

    #1 I'd get that ear on the driveshaft repaired.
    #2 Check the flywheel/TC bolts for loose or cracks.
    #3 Check that tranny mount and the motor mounts.
    #4 Pray its simple and cheap.[​IMG]

    Surgeon General's Warning:
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  16. Waxer

    Waxer 1/2 ton status Author

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    If all else doesnt show what the problem is, you could rule out the rear axle somewhat by removing the rear driveshaft and driving on only the front. It isn't 100% accurate, but should give you an idea if its coming from the rear axle or not.

    Crawlin the rocks with my K5
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  17. Espen88k5

    Espen88k5 1/2 ton status

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    Checked my flywheel and flex-plate, could tighten each bolt maybe a 1/4 turn. Only 3 bolts where used, the other 3 treaded holes where empty?
    Also I ordered new tranny and engine mounts today. I will also get me a new slip-yoke. Anybody know what the partnumber and/or price is for one of those?


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  18. grumpyone

    grumpyone Registered Member

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    iF IT SEEMS TO BE THE SAME SPEED AS THE TIRES I THINK IT IS DRIVESHAFT RELATED.ANY PLAY IN THE SHAFT MAKES IT NOT RUN IN A TRUE CIRCLE, I CHANGED THE SHIM ON MY AXLE MY YOKE WAS BINDING UP AGAINST THE EAR ON MY SHAFT WHEN I TOOK OFF DUE TO MY BAD ANGLE AND SPRING WRAP UP.
     
  19. ftn96

    ftn96 1/2 ton status

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    There were only 3 bolts?????? Ahhhh...huuuhh.
    That is probably the problemo.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
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  20. Thumper

    Thumper 1/2 ton status

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    Any flex plates Ive ever seen only have 3 bolts holding it to the converter. How does the tranny shift? Does it hit all gears at the right speed? When my torque converter on my TH400 packed in, it shifted fine, but when I took off, it was like a std taking off in 3rd gear. No shuddering or noise, just really doggy. Try putting it in drive, leaning out the drivers door (or getting a assistant) and holding the brakes and slowly apply the gas and see if anything moves, twists (diff), clunks (rear end), shudders, or otherwise makes the same noise. Then even walk along beside the truck and have your assistant slowly drive away while you watch everything under your truck in the driveline. See if you can hear where the noise is coming from. I have been spotted by my neighbors riding my bike along, while my wife drives the truck, and leaning down almost under it listening and looking for noises. Just make sure you trust her! [​IMG]

    Mike


    <font color=blue>Thumper
    85 Fullsize Jimmy
    [​IMG]
    <font color=red>Aint Skeered!! </font color=red>
     

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