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  1. Tom says:

    I have a 1988 Chevy short bed single cab that has an immobilized rear end when I put it gear it take awhile to engage and when it does it makes a loud clunking noise I’ve tore it all apart and none of my gears are destroyed and my axles are fine I’m just wandering what it might be that is emobilizing my rear end any help would be appreciated thank you

  2. Tech Guy says:

    Hi there Tom,

    Thanks for your question. Since it takes a while for it to engage, I would be taking a look at the automatic transmission and especially the output shaft. It could be that the transmission has the issue rather than your rear differential. Take a close look at the driveline u-joints while you’re at it. You can remove the rear driveline and put the truck in gear to see and/or hear what the transmission is doing. If you do this, you will need to take the front slip-yoke apart (by removing the u-joint) so that you can re-install it temporarily on the rear of the transmission. Otherwise, you could lose fluid out of the transmission output seal since it won’t have a surface to seal against. Also, using this method, do not over rev the engine… as you could spin the rear slip-yoke right out of the transmission and cause even more damage and the risk of personal injury. You basically do this in a slow and controlled way just to listen and watch for engagement of the transmission. If you’re unsure on how to do this, I would recommend that you enlist a local shop to diagnose this for you. The loud clunking noise could also be due to excessive play of the rear pinion gear. Check for a loose or backed-off pinion nut and/or excess backlash (play) of the rear pinion gear as it mates up to the ring gear. Just some thoughts and keep us posted. Good luck.

  3. allen says:

    I have a 2005 jeep liberty. When i drive in forwaed motion it sounds like a spring kinda winding up. But in reverse it dont. Iv tryed looking at it to find the sorce but am unable to. The sound is coming from the rear driver side and almost sounds as if its the brake caliper. Can you help determine what the issue may be?

  4. Tech Guy says:

    Hello Allen,

    If you have pin pointed this to the driver side, I would have the wheel bearing assembly checked and inspected very closely for wear and/or vibration. Good luck and keep us posted.

  5. Racheal says:

    I have a 98 ford f150 short bed have some grinding noise when we drive my husband said the only thing that makes it drive is 4 wheel drive. I noticed when in reverse we backed up hit a spot in the snow where it was difficult to back up it would make a loud grinding noise like example; when ur putting in ur 4×4 the stick in gear but ur doin it wrong that loud grine like that noise but underneath sounds like on both sides my husband said the grinding when u drive. N think its from overload. Our break light stays on as well

  6. Tech Guy says:

    Hi Racheal,

    If this noise only happens in 4 wheel drive, then I would be suspect of some gear damage coming from the transfer case. The transfer case, when engaged in 4WD, transfers power to the front driveshaft through gears (and in some cases gears and a chain) that can become damaged over time or with a lack of gear lubricant. This will necessitate closer inspection and most likely disassembly to correctly diagnose the trouble. Good luck and keep us posted.

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