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Thread: 80' Cj7 Drivetrain issues

  1. #1
    Newbie coastiejeepin's Avatar
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    Default 80' Cj7 Drivetrain issues

    Ok so heres the deal, last week I was driving to Woodbridge when this very awful knock started to sound. It only makes it when it is moving, it gets faster as speed increases as well gets louder. It sounds like its coming from the rear differential/transfer case...kinda broad I know. Now here is the other issue tied into that noise that may give some ideas on what the hell is going on. I put the back up on jack stands....started it up and without it being in gear the tires started spinning!!!!! So i disengaged the transfer case and sure enough it stopped. Also the transfer case is very easy to shift into 4wd low and high, were as about a month ago wheeling it was a bitch.

    I have no idea what the hell is going on, any ideas on what to do would be greatly appreciated.....and a spare transfer case would be nice (if thats the issue)
    80' Cj7 - my pride and joy

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    Junior Member CJ Chet's Avatar
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    Look at your driveshaft u-joints.
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    Senior Member HillBillE's Avatar
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    x2 on the U-joints. Also check the tranny mount and torque arm bushing.


    As for the wheels turning, a lot of manual tranny's will do that.

    The input shaft is turning, and moving the lube around, which in turn gets the gears moving, and the tires (unrestricted, on the jack stands) start spinning.


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    Quote Originally Posted by coastiejeepin View Post
    Also the transfer case is very easy to shift into 4wd low and high, were as about a month ago wheeling it was a bitch.
    Check the tc shifter mount and rails that go into the tc, A pin might have broken giving the illusion of an easy shift due to the fact that the front axle gears (inside the case) aren't being engaged.

    Just a thought.

    Later, T.J.

  5. #5
    Land Squid Jeffb_79's Avatar
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    I would definitely check out the rear drive shaft u joints... might be time for an overhaul. If it's knocking that loud, the bad joint/joints should be fairly noticeable. If you don't see any bad joints, or can't tell, pull the rear shaft and drive out in 4 hi to see if the knocking is still there. If not, replace the drive shaft u joints. If so, pull the cover on your rear diff and look for metal shavings. I'd put money on the u joints though.

    Not really sure about the transfercase. I know there's days where mine is a pain in the butt to move into any position, and days where it shifts like butter.

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    Newbie coastiejeepin's Avatar
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    Alright, so here is what happened......the 4.10 gears I got from Quadratec were faulty, had hair line fractures in all the teeth. The teeth broke apart and dicked everything up. Quadratec ended up sending me a brand new rebuild kit as well as the rack and pinion. Oh, and my U-joints were bad.....found that out when the drive shaft dropped bc the u-joints broke.....lol
    80' Cj7 - my pride and joy

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    Got Beer airforce26yrs's Avatar
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    Glad you got it figured out and that Quadratec is standing behind there product.
    I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.

    If you do not have time to do it right the first time, how do you have time do do it over?

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