TruTrac Install in a 1031 axle

[linuxman51]

Not sure about Truetrac, but with G80, we use a late rear axle on the right side- abs I believe-it?s shorter

think the car it all came out of had abs... yea 48 tooth deal, so I used the whole abs rear end.

 

[gsellstr]

Yeah, the G80's required a shorter one to not add pressure to things in the diff. Not saying that's the case on the TT, but it's a concept at least, given the weird performance you've got going. Might also be worth a call to Eaton, see why it might be staying locked on decel.

Assuming fluid is proper in it?

 

[linuxman51]

Yeah, the G80's required a shorter one to not add pressure to things in the diff. Not saying that's the case on the TT, but it's a concept at least, given the weird performance you've got going. Might also be worth a call to Eaton, see why it might be staying locked on decel.

Assuming fluid is proper in it?

yeah I think I used some basic fairly cheap stuff. looks like non-synth gl-5 without fricition modifiers

 

[gsellstr]

Should be fine then. Definitely something ain't right internally then. Next time you're bored, see if the axles don't slide in completely without having to force it that last little bit? PITA but worth a check at least. That's how I found my G80 axle had an incorrect axle in one side, kept things locked up.

 

[culberro]

finally found this thread again. toying with putting one in the black wagon (a TT), but then remembered I do have an annoying issue with the one in the blue 242.. that may be due to lack of miles on the unit... it's essentially locked 24/7, as in I can't even coast into a parking spot without it trying to scrub tires and make all kinds of racket.. at low speeds it's a whole lot like a welded diff, which is annoying tbh.

What are the actual real-world implications of using the low-preload version (585 I think?), I definitely don't want the same behavior from the wagon

Did you do any sort of break-in figure 8s?

I?ve done a few installs of the 588 diffs, and they are really tight when new. After ~5min of big figure 8s and some smaller ones, they quiet down a noticeable amount. You don?t need to be spinning the tires and getting on the throttle during this, but just making the LSD gears spin and mesh properly. Eaton refers to this as ?lapping?? which isn?t technically correct, but it kind of makes sense.

But yeah, new 588 will drag the inner tire on turns for a while. The break-in 8s seem to help.

 

[linuxman51]

I installed it several years ago, but it's probably got ~3-400 miles on it (not of donuts or anything like that)

 

[linuxman51]

it will not coast backwards turning into a parking spot (for instance).. that's either clutch in, or in neutral. it definitely won't do it in gear, in fact it almost always kills the engine

 

[gsellstr]

No break-in on mine other than light driving for the first tank of gas.

Kenny... That really ain't right. Any chance the heads are too tight and binding or something?

 

[culberro]

it will not coast backwards turning into a parking spot (for instance).. that's either clutch in, or in neutral. it definitely won't do it in gear, in fact it almost always kills the engine

Yeah, something?s not right there. Helical diffs work by basically jamming the gears together and into the case? not an ideal design. I could see how a hard launch or burnout might damage the case (which is surprisingly soft) by having a gear tooth leave a mark/dent? and then a gear binding on that.

Even though Eaton doesn?t say you need to do figure 8s, it does accelerated the break in process and makes them significantly smoother right from the get go. Might be worth a shot. The gears are basically machining themselves and the case in this process. It?s not pretty, but it?s how they work.

 

[linuxman51]

I'll give it a shot when I get the blue car back on the road (stole the cas as a spare for the black wagon), but this is reassuring for the black wagon.

 

[blkaplan]

Yeah, something?s not right there. Helical diffs work by basically jamming the gears together and into the case? not an ideal design. I could see how a hard launch or burnout might damage the case (which is surprisingly soft) by having a gear tooth leave a mark/dent? and then a gear binding on that.

Even though Eaton doesn?t say you need to do figure 8s, it does accelerated the break in process and makes them significantly smoother right from the get go. Might be worth a shot. The gears are basically machining themselves and the case in this process. It?s not pretty, but it?s how they work.

I couldn't believe the amount of metal fillings in my axle after I did the break in on my truetrac back in the day.