Truetrac install
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More Turbo
Joined: Jun 2014
Posts: 749
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From: Pagosa Springs CO.
Truetrac install
I'm having a local shop install a Detroit truetrac,
they asked me to bring all the parts needed.
Truck has 157k, are there other parts involved such as bearings or seals?
they asked me to bring all the parts needed.
Truck has 157k, are there other parts involved such as bearings or seals?
Posting Guru
Joined: Aug 2012
Posts: 1,144
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From: ALPHA ,NJ
my truck had 153k on it when I had my locker installed. The only extra thing they needed was bearings for my truck. Bolts ring gear and toner ring were all reused.
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More Turbo
Joined: Jun 2014
Posts: 749
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From: Pagosa Springs CO.
Thanks
Fleet Owner
Joined: Mar 2003
Posts: 24,724
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From: Blue Hill Township
I replaced the carrier bearings and races when I did mine. I didn't replace the pinion seal or bearings because there was nothing wrong with them. I think I had 150k when I did mine.
I also put the 08+ aluminum cover on. Detroit recommends using a conventional gear oil with the truetrac instead of synthetic. I used 80W-90.
I also put the 08+ aluminum cover on. Detroit recommends using a conventional gear oil with the truetrac instead of synthetic. I used 80W-90.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
You need new carrier bearings, races and a carrier shim kit, no need to mess with the pinion if they are just swapping the carrier. As said before the Truetrac requires non synthetic but I wouldn't tun 80w90 to light for a heavy duty truck rear end, I use 85W140 in mine.
https://www.ebay.com/itm/FORD-10-25-...M~~p:rk:3:pf:0
https://www.ebay.com/itm/FORD-10-25-...M~~p:rk:3:pf:0
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Cargo Master
Joined: Dec 2015
Posts: 2,542
Likes: 322
From: Harned, Ky
That's interesting, my 04 F-450 came factory with a truetrac and synthetic fluid. 75W-90, same oil I ran in semi truck rears for years.
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Logistics Pro
Joined: May 2017
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From: Southern OH
That's also a different axle, Ford specs 75w140 for the 10.5 but since they don't make that in non synthetic 85w140 is what you should use.
Cargo Master
Joined: Dec 2015
Posts: 2,542
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From: Harned, Ky
75w90 is to thin for a Ford 10.5 axle but is ok for my Dana 110 and big rig diffs with 1800 lb torque engines, now that's real interesting.
Logistics Pro
Joined: May 2017
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From: Southern OH
Straight from Eaton's website FAQ for the Truetrac.
Q: What kind of oil should I use? Can I use synthetic? Do I need friction additive/modifier?
A: A quality petroleum/mineral based oil works best in the Truetrac units. We do not recommend synthetic oil. Friction additive/modifier is not required.
More Turbo
Joined: Jan 2010
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A few years ago, after much reading about the best oil for a Truetrac in a Ford 10.5” axle, I landed on Lucas 85w140 non-synthetic. I used this oil and it worked great. No chatter from the Trutrac and it still locked-up quickly.
Cargo Master
Joined: Dec 2015
Posts: 2,542
Likes: 322
From: Harned, Ky
Straight from Eaton's website FAQ for the Truetrac.Q: What kind of oil should I use? Can I use synthetic? Do I need friction additive/modifier?
A: A quality petroleum/mineral based oil works best in the Truetrac units. We do not recommend synthetic oil. Friction additive/modifier is not required.
A: A quality petroleum/mineral based oil works best in the Truetrac units. We do not recommend synthetic oil. Friction additive/modifier is not required.
Notice the However section in the lower part.
My 04 owners manual states
Ford 10.5 (75W-140 synthetic)
Dana 80 (75W-90 synthetic)
Dana 110 (75W-90 synthetic)
Dana 135 (80W90)
07 owners manual states
Ford 10.5 (75W-140 synthetic)
Dana 80 (75W-90 synthetic)
Dana 110/130 (75W-140 synthetic)
No mention in the either owners manual about open or locking diff using a different oil.
Both the 04 and 07 Dana 110 axles have Truetrac units, both have had synthetic oil in them since new, came from the factory that way.
Logistics Pro
Joined: May 2017
Posts: 3,523
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From: Southern OH
The main reason vehicle manufacturers recommend synthetic is because 95% of drivers never think about changing their axle gear oil, since synthetic has a longer service life that is what they put in at the factory. However most aftermarket differential companies like Eaton, Yukon, Auburn, and Richmond recommend regular gear oil.
Cargo Master
Joined: Dec 2015
Posts: 2,542
Likes: 322
From: Harned, Ky
I don't run synthetic because of longer service life.
I run it because it runs cooler giving longer bearing life and lower rolling resistance for better fuel mileage.
Had a 78 F-150 with 80W-90 in both diffs and the 4 spd trans, in 20 degree weather or colder the oil was so thick you couldn't roll it off a cliff.
I run it because it runs cooler giving longer bearing life and lower rolling resistance for better fuel mileage.
Had a 78 F-150 with 80W-90 in both diffs and the 4 spd trans, in 20 degree weather or colder the oil was so thick you couldn't roll it off a cliff.