well... i narrowed it down to the rear end and not tranny. I had the rear lifted off the ground and ran it through the gears... the whinning was loudest at 60mph and trails off after which.

At the track today the first burnout was alright... the next two, the driver's side tire was struggling to keep up with the passenger side and threw me sideways when it would finally start to spin.

I didnt do anything stupid.. it just started whinning two days ago... and i figured, i might as well go ahead and go through with the track plans and see if i can break something... bc the tranny is still warrentied.

Sooo what im thinking is that its the driver's side carrier bearing... bc regular driving is fine. I actually ran a bit faster than normal today and it was the most harsh conditions ive ever ran in (90*+ and 80-88% humidty), so no drivablitiy issues, other than the annoying noise and the burnouts not being clean.

what i was wondering is... why would this happen? and am i going in the right direction in thinking its the carrier bearing making the noise? or could it possibly be that axle... im trying to figure out the parts to order ahead of time... i might as well go ahead and order the carrier bearings and replace both sides... any guidence will be well appreciated

 

pick the rear off the ground again, get a clean screwdriver and while you have it in gear and idleing place the screwdriver against the housing where the bearing is, then place your ear to the screwdriver. like a poor mans Stethescope (SP). thats how i found out it was my carrier bearings.

The looked horrible when i pulled them apart.

Do you still have the Gernade-80?

 

no its that aftermarket posi eaton everyone has

 

how many miles are on your Eaton??? sounds kind of like a carrier bearing trying to die on you...

 

If your carrier bearing is going out, why would that cause one axle to spin slower than the other and not give you a clean burnout???? just curious, sounds like to me your eaton is on its way out.... not saying your bearings arent going out and making your noise.

 

i dont think he has that many miles on it.
but i havent heard any problems with the Eatons..

 

theres about 12-15k miles on it...

oh idk.. thats why i was asking what would cause the noise/weird burnout like i had today... i know its a limited slip, but its never done that

 

When you mentioned your carrier bearing today, for some reason I was thinking the carrier bearing for the 2 piece shafts on ext. cabs. I was thinking "he shouldn't have one but I'll just roll with it." So disregard what I said about the shims; I've been really out of it all day today. It does sound like the bearings are your problem though; hope you get it worked out. LMK if you need any help with it.

 

well... i think i just figured it out... well narrowed it down we'll say

the transmission is shifting fine, fluid isnt burnt... but isnt there some type of bearings or something that needs to be lubricated where the driveshaft enters the tailshaft of the tranny?

the reason why i dont think its the rear any more is because this morning i talked a guy into letting me put my truck up on a lift and letting it spin in gear and see what he thought, we let the tires spin up to 60mph or so and than put it into neutral, the sound went away in neutral... and i tried it myself going down a steep hill on the way home from the shop, just dropped it in neutral and the sound went away... so im thinking now its transmission related. But since the fluid isnt burnt... im thinking it has something to do with the tailshaft... what kind of grease can i use to lube the spline on the tailshaft/driveshaft yoke?

 

it may have gone away in neutral because there wasnt a load on the rearend from spinning the tires over... I wouldnt rule out the rear just yet man... a dyno would let you do a better test since you actually have a load on the rollers and can simulate driving... and be able to see whats going on.
-as far as lubing the tailshaft, I never have put any kind of grease in there and have never had a problem with it... I am guessing its lubed from the tranny fluid... I'm honestly not positive about that...