Hophead

My rear end is making a growing amount of noise - a constant whirring on the gas and classic gear chatter on deceleration - I suspect the pinion bearing(s). Is it possible to replace the front bearing without disassembling the third? I am weighing my options wheather to repair or replace with a junkyard third.....been quoted $250 from a local yard for a 4.56third.

advice.

DeathCougar

iTrader: (23)

No, you will have to remove and dismantle the third to get the bearings out.

What are the miles and condition of the used third?

tc

Sure it's not a u-joint?

Hophead

I haven't seen the third offered-I just asked for a quote last time I was at the yard - Briefly checked u-joints - they looked OK no play. We have had 2-3' of the white stuff here recently and now it is pouring rain - not the best weather to be working outside in! I crawled under the truck yesterday and felt the play at the pinion flange (drivshaft still attached) and within the play of the gears there was what seemed to feel like a rough bearing. I have access to a 'gear man' at a freinds work (Kenworth) who wound probably set up a third for a bottle of his choice. I haven't looked at what an install kit is going to cost me locally.

I will head out in a bit and take off the driveshaft and jack up the rear end and get a real feel for whats going on.

Thanks for the replies!

tc

Play in the pinion flange = bad

Probably means the crush sleeve got deformed and you lost your bearing preload...

space-junk

iTrader: (1)

is there any way to reset the bearing preload without pulling the third??

swapped89

No way. all the bearing load stuff is inside the third. If your getting diff work done i would scrap the crush sleeve and have a trail gear solid spacer installed while your at it.

Hophead

So.... pulled the driveshaft, rear wheels off the ground - no play in either flanges - T-case or rear diff. Rear diff spun freely by hand, no noticeable 'bad bearing' feel. Pulled the fill plug on the rear diff and took a sample - milky gear oil - water in the diff.

So on the advice of a friend I drained the old fluid and put in a 50/50 Lucas heavy duty oil additive and fresh gear oil. Obviously this did not 'fix' anything - I am just trying to get by untill I find a replacement diff.

Now obviously the bearings are not happy (found some small metal shavings on the drain plug) When driving I still get the classic gear growl on deceleration - my thoughts are that the bearings are worn (DUH!) and the pinion is now wlking up and down the ring gear.

My question is - would I not feel this movement when I tried to move the pinion at the flange?

I am going to head down to a friends shop and check the bearing preload on the pinion.


Is there anything in the t-case that would make similar noises/ symptoms?


Started looking for a replacement third.

dropzone

iTrader: (6)

better check your trannie, TC and front diff fluid too...
this thread on ttora i believe the vendor had a limited number of used thirds
available:
http://ttora.com/forum/showthread.php?t=117978

Hophead

Ya I will be checking/changing front diff, tranny, t-case tomorrow.

Thanks for the link but I think the shipping would kill me!