Middian

im hearing a loud noise under my car i have some videos here. it also doesnt like going in reverse it will engage but once i start moving it starts shaking a bit car turns on no problem and revs in park no problem

Bfg

Check your drive shaft

76olds

Sounds like the trans linkage isn't fully disengaging out of drive into neutral .

Middian

bingo so this happened right now going in reverse

Middian

im mechanically inclined and have tools any idea if i can fix this what do you guys think went wrong what's it going to take to fix if i cant do it whats a ballpark figure

scottv442

looks like your pinion nut somehow backed off and allowed the yoke to separate from the pinion gear. the nut is supposed to be torqued on to the pinion tight, so not sure how this could happen. if its just the nut, then you could be rel lucky and just find another nut to replace the one you lost.

Middian

Im going to lift the car tomorrow and clean it up real good where is this nut I'm looking for exactly located?

scottv442

its in the center of the driveshaft yoke. i think it is a 1 1/8" diameter nut if i remeber right. it bolts the driveshaft yoke to the splined pinion shaft you see sticking out of your rear differential. the yoke is splined too. they slide over one another and the nut holds them together. your yoke is hanging loose and the splined pinion gear is showing sticking out of the diff. if your real lucky the nut might still be there hanging loose in the yoke.

Middian

could I possibly if the nut is still there unbolt the smaller part of the pinion that connects the pinion to the yoke, bolt that part to the yoke then re bolt the smaller part of the pinion to the pinion? Is that how this would happen or do I have to release the whole pinion

scottv442

you will need to unbolt the driveshaft from the pinion yoke and then slide the pinion yoke back over the splined pinion sticking out of the diff. its the only way you to get a 1 1/8" socket over the pinion nut to tighten the yoke to the splined pinion. once that assembly is back together and the nut is torqued to spec., then you bolt the driveshaft back onto the pinion yoke. fill the diif up to the drain plug level with 80w90 gear oil and your done.

Middian

it sounds pretty straight forward in gonna look at the damage tomorrow. Thanks!

oldcutlass

At minimum you need to replace the seal and crush washer. Torque to the required setting.

Middian

anyone know where i can buy these seals and washers?

Middian

any idea where i can get the crush washer and seal

HX3

If you are unable to locate elsewhere, McCaster-Carr is a good source for washes, seals, fittings, fasteners, joints, etc. Here are their crush washers ... only bad thing is sometimes the quantity which you need to purchase if you want just one.

​​​​​​https://www.mcmaster.com/#crush-washers/=1ch0crj

Rustbucket2

My truck was making same noise, nut was ready to come off, I was able to retighten it, that was two years ago, still going strong . I was luck it didn't come apart.

scottv442

I would try Napa or other major auto parts stores first. Crush sleeve is more of a specialty item that the seal. If you have a tranny shop that does diffs too, I would try there.

RetroRanger

I would say NAPA rockauto, or possibly pep boys, autozone, advance auto

1970greensupreme

If you were driving it like that when it was loosening up chances are pretty good you damaged the ring and pinion gear. Take the cover off and have a look before ordering anything. I've seen this happen with newer mopars, truck in particular and it makes a mess of the ring and pinion. The pinion actually ends up grinding into the carrier and so on

droldsmorland

Dennys Driveshafts

http://www.dennysdriveshaft.com

At a minimum, you should pull the inspection cover and look at the gears and inspect for debris. Chances are you're in for a bit more fun. Inspect the pinion splines and U Joints as well. You might get lucky?

If it was me the entire rear end would come apart for inspection. Chances are high the pinion bearings have been affected. At that point, you're committed to a full rebuild...IMO.

Follow up and let us know how it goes to close this thread.