Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: blackrube on September 29, 2007, 03:45:49 PM

Title: front wheel drive jeep
Post by: blackrube on September 29, 2007, 03:45:49 PM

pulled away froma stop sign today and somthing let go in the rear diff ....could get it to go faor a few blocks ,felt like a auto trans does when it slips,,,then nothin,,just a whiring grinding noise,,had to use 4wd to get home

what did i break?   diff   or an axle?  any help would be great

mike

oh ya its a 81 cj

Title: front wheel drive jeep
Post by: NS-jeeper on September 29, 2007, 07:51:49 PM

your rear drive shaft maybe

Title: front wheel drive jeep
Post by: FiEND on September 29, 2007, 08:10:25 PM

maybe the rear pinion

Title: front wheel drive jeep
Post by: blackrube on September 29, 2007, 08:56:57 PM

Quote from: "NS-jeeper"

your rear drive shaft maybe

its,fine :)


most likely ring or pinion i figure,,,,,just had it in for axle seals ,,wonder if that had anything to do with it

Title: front wheel drive jeep
Post by: cuzican on September 29, 2007, 09:32:32 PM

If you have an AMC 20 the splines may have stripped in your two piece axle.

I never had one strip but I would guess you could put it in gear and look at the nut. If its spinning you know its stripped.  You could weld the hub to the axle or just replace the side axle/hub.

Title: front wheel drive jeep
Post by: NS-jeeper on September 29, 2007, 09:49:15 PM

You could always put the rear up on jack stands put it in gear and give it some gas and see what spins

Title: front wheel drive jeep
Post by: frenchy on September 29, 2007, 11:00:56 PM

Think I have a spare AMC 20 kickin around here, moser 1 piece axles, 3:54 gears, if you need it....

Title: front wheel drive jeep
Post by: blackrube on September 30, 2007, 06:02:38 PM

couldnt get the inspetion cover off to look inside ,,so i still dont know what is broke yet ,

frenchy          as soon as i can figure out what gears i have i may take you up on that diff

Title: amc 20
Post by: bae146 on September 30, 2007, 09:02:23 PM

Doesn't  the amc 20 use the 2 piece axle?  He probably just sheared the key way at the end of the shaft.  The nut on the shaft will hold the wheel on.  Simple fix if he hasn't damaged the shaft to bad.

Title: front wheel drive jeep
Post by: blackrube on October 01, 2007, 04:28:53 PM

im not familiar with amc diffs at all,,, other jeeps always had danas,,,an explenation or better yet pics of what i need to do to fix this if it is a pin thats sheered off

do i need to pull the axle or can i get at it from the cover

im not a jeep noob ,but shure feel like one when it comes to diffs

thanx
mike

Title: front wheel drive jeep
Post by: frenchy on October 01, 2007, 05:50:24 PM

Should look like this diff
(http://www.geocities.com/cantwait_forviolence/images/my_jeep/rear_end.jpg)

Exploded view:
(http://i22.photobucket.com/albums/b350/cantwait_forviolence/0900823d801d7a26.gif)

Should have a nut on the end like this: (under the dust cap)
(http://images.jpmagazine.com/techarticles/p101057_image_large.jpg)

I'd jack it up and turn driveshaft and wheels, see what's turning and what isn't. Or get a helper, test and see where the noise is coming from...

Title: bolts
Post by: bae146 on October 01, 2007, 07:26:41 PM

If the rear shaft has spun the keyway, you can remove the axle by removing the 4 bolts that surround the bearing going through the backing plate and into the diff housing.  The difficult part is to find out which shaft has spun.  If you remove the bearing caps and step on the brake, let out the clutch in first gear, and have someone watch the  large nut, to see which one spins.  Make sure the jeep is blocked and do it in two wheel drive.  Once you have determined which one is toast then remove that axle and you will probably have to replace it.  You may get lucky and be able to salvage it, if you can just clean it up and replace the sheared keyway.

Title: front wheel drive jeep
Post by: blackrube on October 03, 2007, 07:09:50 PM

perfect,,,thanx guys

let you know after the weekend how it turns out

Title: front wheel drive jeep
Post by: blackrube on October 13, 2007, 11:16:42 PM

turns out the axle is ok but the splines are toast ,,just going to welder up and be done wth it

thx
mike