New truetrac require early change?

[domer10]

I did not even ask, nor did the shop that installed my Detroit truetrac tell me about a break in, or early drain and refill. Just wondering if anyone has experience with truetrac and or a early drain and refill should be done?

I know I should have asked, but dropped vehicle off at 7 am and picked it up 5 minutes before closing and owner/installer had already left. I have roughly 1000 k now on it, and keep meaning to swing by and ask, but either end up forgetting or life happens.

Want to stay on top of it, I know this is a different rear end than the clutch style stock lsd, but wondering If different applications may still require more frequent maintenance.

Fluid was redline 75-90, 13 Jeep Sahara, no lift etc.

 

[CT8]

Something to ponder.

 

[domer10]

Originally Posted by CT8
Something to ponder.



Ya if you read, I commented. A Detroit truetrac is a different type of rear end than stock. In either of years.

 

[oldhp]

I would call the manufacturer for their recommendation. Did they install new bearings? Did you keep the same ring & pinion?

On the other hand it probably doesn't take more than 2 qts, pretty cheap insurance just to change it out. That way you can check for metal shavings etc.

 

[domer10]

All new, bearings and all...the whole lot.

 

[domer10]

Originally Posted by oldhp
I would call the manufacturer for their recommendation. Did they install new bearings? Did you keep the same ring & pinion?

On the other hand it probably doesn't take more than 2 qts, pretty cheap insurance just to change it out. That way you can check for metal shavings etc.


All new, bearings and all...the whole lot.

 

[oldhp]

Ya I would change it. That way you know if there is any metal shaving's in there.

 

[CT8]

Originally Posted by domer10
Originally Posted by CT8
Something to ponder.



Ya if you read, I commented. A Detroit truetrac is a different type of rear end than stock. In either of years.

I have known what a trutrac is since they were first marketed. They are a differential.

 

[domer10]

Originally Posted by CT8
Originally Posted by domer10
Originally Posted by CT8
Something to ponder.



Ya if you read, I commented. A Detroit truetrac is a different type of rear end than stock. In either of years.

I have known what a trutrac is since they were first marketed. They are a differential.


They are most definitely not like the stock lsd differential, which was clutch based, and he'll of a lot harsher on fluid and unit itself. Where truetrac
has been designed to be a clutch-less operation which makes this a reliable, long lasting limited slip differential.

 

[Donald]

Originally Posted by domer10
Originally Posted by CT8
Originally Posted by domer10
Originally Posted by CT8
Something to ponder.



Ya if you read, I commented. A Detroit truetrac is a different type of rear end than stock. In either of years.

I have known what a trutrac is since they were first marketed. They are a differential.


They are most definitely not like the stock lsd differential, which was clutch based, and he'll of a lot harsher on fluid and unit itself. Where truetrac
has been designed to be a clutch-less operation which makes this a reliable, long lasting limited slip differential.


But it falls short of actually locking the differential. When I had a Jeep Grand Cherokee it had a 4WD setting of PT which locked the differentials.

 

[UNC151]

Originally Posted by domer10
Originally Posted by CT8
Something to ponder.
Ya if you read, I commented. A Detroit truetrac is a different type of rear end than stock. In either of years.
For clarity (and I posted it in the other thread), my axles are not LSD, they are ELD (electronic locking differentials) and thus I have no clutch packs to generate friction material in the oil. That not withstanding, I would dump it early just to get the break-in metals out and based my short experience with my Dana 44 axles, the lowest viscosity I would run would be 75W-110 in the front and 75W-140 in the rear.

 

[thastinger]

I've had a TruTrac in my F150 9.75 Sterling rear end for years now. I kept my same ring & pinion but it is interesting that detroit told the install shop to use dino rear diff fluid. They put 80w90 conventional in it and I changed it to 75/140 synthetic after a couple hundred miles. Its been fine and its been several years now since it was installed. Truck has 507HP&630TQ

 

[LDM]

Not a TruTrac but back when I swapped out the old 10 bolt in my 94 Camaro Z28 with a Strange S60 with the Detroit Locker the procedure was to drive 50 miles at 45 MPH, let it do a full cooldown, then repeat until 500 miles were reached. Then dump the gear oil and replace. If you didn't replace the entire axle, you may not have needed such a break in process but it would still be a good idea to dump the initial fill to get out any of the break-in metals.