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In reverse, grinding???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Nov 10, 2001.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    When I drive in reverse, and turn the wheel full left - there is a funny sounding rubbing or grinding noise that my truck has always had. I thought maybe it was the front suspension binding and figured the cross over would fix that problem. Well now the xover is in, and the d@mn noise is still there.

    The only other thing I have thought of is, perhaps its the Detroit? The big block has a lot of torque NOW (thanks Rene!), and the locker locks immediately on any amount of acceleration.

    Anyone else ever experience this noise? The sound is so deep and overwhelming in the truck that I can't determine where the noise is coming from (front, rear, trans, diff, etc.)

    Lemme know what you guys/gals think! Thanks [​IMG]

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Mine shudders and chirps in a similar situation, but it's welded in the rear.[​IMG] It might seem kinda obvious but is the front tire rubbing something at full lock? Spring maybe?

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    No obvious rubbing in front, but when standing outside the truck, it sounds like its coming from the front end. The D60 is open... but I have never opened it. Maybe something in there can make such a horrible noise? The noise is so bad at times that the entire truck shudders! [​IMG]

    So no parts binding the front suspension (and I only have 35" tires and 9" total lift), but the noise seems to come from there. BTW, there is no driveshaft to the front diff yet since I have mismatched gears... STILL. [​IMG] And the hubs are unlocked. Any other ideas?

    I have had someone outside trying to figre it out, but there is no obvious source. I have looked too, but haven't found it yet either. Its starting to piss me off now! [​IMG]

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well lets work through what moves and what doesn't as you're backing up. No driveshaft in 2HI, hub's unlocked. Even if the front was welded nothing should be turning in the front diff at all. That leaves anything from the hubs out on the front-end and nothing is coming to mind unless the wheel bearings are toast. Are all the motor and tranny/T-case mounts in good shape? I know being welded in the rear and turning tightly causes some stress...the floor on my Jimmy creaks and pops in that situation.

    I have two sets of tires for my truck...with my General Grabbers on stock steel rims the inside edge of the tire hits and rubs the draglink at full lock. That sounds horrible when that happens. Have you removed the tire and looked for shiny spots? Does the noise only happen at full lock in one direction only?

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  6. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Rene-

    The cross over keeps the draglink out of the way, so thats not hitting any where... and I agree, the front diff should have nothing to do with it. ALL the mounts were replaced as the motor trans and xfer were installed.

    This stinks... this one problem is like the last big issue with the truck before I am totally confident in it! I wish I had the answer!

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  7. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Just went and looked at the whole suspension real fast (in the light [​IMG] which is rare for me), and I noticed a rub mark on both the rear shackles from the upper bolts. Would this do that? Should there be marks there? Are those bolts too long? Just an idea...

    <a target="_blank" href=http://24.10.209.54/images/86truck/suspen/rubbin.jpg>PASSENGER SIDE</a>
    <a target="_blank" href=http://24.10.209.54/images/86truck/suspen/rubbin2.jpg>DRIVERS SIDE</a>

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well mine doesn't rub there...I just checked. Pass side has about 3/4" clearance and the drivers side about 1/2" clearance. Try backing it up so it's making the noise and have someone watch that area. Maybe the spring eye bushing is shot?

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  9. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Mine has less than 1/8" gap between the end of the bolt and the bracket!!! [​IMG] Hmmm...

    <font color=red>GOT MUD???</font color=red>
    My license plate reads:<font color=blue> 8 YR SUV</font color=blue>
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Going by the pictures I'd say the amount of bolt sticking out is about the same as mine. Your's are just closer to the bracket. Maybe the bushings are worn badly or something.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     

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