Guys, I have an 83/4 with a TruTrac that Im not happy with due to the noise it makes whilst coasting and cruising nor the way the rear wheels wobble like a loose front wheel bearing.
Im looking for suggestions to a viable alternative that will give me simialr performance.
Car is a E Body, 408/727 (solid roller cam, W2 closed chamber heads, FAST EFI, 11.5:1 CR and so on, makes around 600 at the flywheel), its mostly a street driven beast with the occasional run down the strip or round a circuit. I dont want to go spool and Im thinking a cone or clutch type LSD may or maynot work with the HP, a Locker would be probably ok but is noisy round corners, any suggestions???
I love the way the TruTrac works as such and that its maintenance free and so on, just hate the noise, people that ride with me the first time look at me like the back end of the car is about to fall out!!!

Sounds like it is not set up properly or has something wrong with it?

I have a trutrac and it is excellent with no issues... (not in an 8.75" but same idea)

The clutch type is a good alternative - I run one which is quiet and effective. That said I think the Truetrack a great differential and also wonder if something is wrong with yours.

I have a new replacement still in the box that is worse than the one I had in the car, the problem is the side gear inside of the center can move in its housing, you grab the rear wheel at 3/9, wobble it like you would to check a front wheel bearing and, well not good
[img]http://i3.photobucket.com/albums/y84/crash520/th_IMG_0121.mp4[/img]

eaton claim they are within spec!!! I'm working with Cass on this, he is a great guy and is still arguing the fact with them

eaton claim they are within spec!!! I'm working with Cass on this, he is a great guy and is still arguing the fact with them

I have a trutrac in my 8 3/4 ebody and I don't have any of your problems. Good luck I hope Eaton makes it right.

I've watched your video. If you have that much wobble at the wheel, it has to be almost 3 times that at the end of the axle in the center section. That's just nuts !!!

Stanton, granted there is some tire flex from me pulling and pushing, here is a vid of the side gear when I pulled the centre out. It has also started marking the spline of the axles about half way along the spline giving me cause for concern as for leading to a weakening of the axle, as for the noise, under load it makes no noise, on coast or through a parking lot, it sounds like a jam can full of oil with a half doz lug nuts being rolled along, and no amount of speaker volume hides it!!!!
[img]http://i3.photobucket.com/albums/y84/crash520/th_IMG_0137.mp4[/img]

What do you have for axle bearings? Green non adjustable or tapered? If tapered do you have the spacer in the center between the axles?
Ron

From the movement you have, I'm assuming you don't have conrad bearings (Green bearings), but have the stock tapered roller bearings.

I don't see the differential thrust block in your video. And, that side gear movement is normal. When under torque loads, the elements in the TruTrac 'find their own center' and the pinion gear loads keep the side gear centered.

Dr. Diff's site tells you that you need to install the thrust block when using stock adjustable bearings.
http://www.doctordiff.com/8-3-4-eaton-truetrac-differential.html

The thrust block should have been packed with your TruTrac. It looks like this:


Once you get the thrust block in, you'll be good to go. If you didn't get it, call Eaton. They have pretty good customer service, and they'll get you one.

Bob

After watching the video, I don't see that as a differential issue at all. I see wheel bearing issues. I'd defer to Cass here, though.

using factory tapered bearings, yes the thrust block is installed, yes Cass is all over this and agree's there is a problem, the only way to reduce the 'rattle' is to tighten up the bearing end float to less than the 0.008" recomended however axle bearing failure is likely due to no end float, yes again under load it finds its centre as stated, it does not make a noise under load, the issue is on coast and around parking lots,,, its freaking loud. wheel bearings are brand new.

Hey, I know your problem.....change to a Dana 60 and be done with it. Less headache and you would be on the track already...Tim

Thanks Tim, if they were more plentiful out here I would, shipping alone on a 60 would be close to the cost of one from Cass!!Then lets not talk about the exchange rate, the South Pacific Peso is not doing that great lately

I run a True Trac in my Imperial. Zero noise. That car is so quiet that I'd hear any noise the diff is making.

I hope they can get you straightened out.

mine is doing the same thing, I had green bearings at 1st, then the tapered,it is a problem with the side gears.

My friend had a TruTrac in a 12 bolt. Love the differential action for cornering exits but also complained of noise. The driveshaft could be rotated 45 deg w the wheels locked.

He renamed it True Slack and returned to clutch style.

Yeah, I have to say I love the way it works through corners and burnouts, I love everything about it,,,,,,exept the damn noise, all they need to do is sort out the side gear float and they would be awesome. I dont want to go to a clutch, Ive had those before, a spool is just a PITA as is somewhat a locker on the street,

I JUST WANT A GOOD TRUTRAC Eaton sent me a warranty replacement but as indicated its equal to if not worse in side gear slop.

There is two people above that call it a wheel bearing issue. Your wheel is flopping around and you think the center section should hold it in place? No, that is a wheel bearing issue, and you just can't have it set right if its tapered bearings. With the wheel flopping around like that, there actually would be very little movement in the center section, not an exaggerated movement. AND, there is nothing in the center section to hold the axle in, that is done at the wheel bearing. Good luck with this.