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Auburn / Truetrac FRONT LOCKER QUESTIONS

campfire

campfire

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campfire said:
Any downsides to putting one in my front 10-bolt? I don't want a true locker in my steering axle, but I am curious as to how this compares to the Eaton Posi I have in the other truck. :thinking:

https://greenbay.craigslist.org/pts/d/chevy-limited-slip-carrier/6451196807.html

The picture doesn't match Summit's catalog picture, could someone verify that this is actually an Auburn?

https://www.summitracing.com/parts/aub-542018
Click to expand...
At the price summit is offering you’d be money ahead to skip the “needs a rebuild” Craigslist option.
Might be an older series Auburn, but that have a reputation as a good unit
 
Tru Trac was good on road but I don't know if you'd like it off road. It's a torsion locker so yes it won't wear out and doesn't need friction modifier but it will on lock with a wheel in the air.
I've never run the auburn but it held up in my uncles 12 bolt rear behind some considerable power
 
sweetk30 said:
lots of guys i have read like the detroit true trac helical gear posi . no clutches to wear out . no special oil additive .
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SpeedlabDan said:
Tru Trac was good on road but I don't know if you'd like it off road. It's a torsion locker so yes it won't wear out and doesn't need friction modifier but it will on lock with a wheel in the air.
I've never run the auburn but it held up in my uncles 12 bolt rear behind some considerable power
Click to expand...

A clutch-based posi will have that same problem. I don't want to be dealing with locker steer in both axles (rear is Detroit). So...I'm either stuck with wheel spin or with running selectable, no? Are there other options? :dunno:
 
That's not an auburn LS That is a trac lock.

Trac locks are easily rebuilt and you can add clutches. Of course they are also available online for 270 bucks

Trac locks are fine. I might get one. They require friction modifier, and it ups how often you need to change the gear oil. The caveat is they are less effective than the others usually set up pretty light from the factory.

https://m.ebay.com/itm/MONKEY-GRIP-...480914?hash=item3aafdb3112:g:A~MAAOSwySVaN-hH
 
blazinzuk said:
That's not an auburn LS That is a trac lock.

Trac locks are easily rebuilt and you can add clutches. Of course they are also available online for 270 bucks

Trac locks are fine. I might get one. They require friction modifier, and it ups how often you need to change the gear oil. The caveat is they are less effective than the others usually set up pretty light from the factory.

https://m.ebay.com/itm/MONKEY-GRIP-...480914?hash=item3aafdb3112:g:A~MAAOSwySVaN-hH
Click to expand...

Thank you. I was about to post up that nothing on Auburn's website matched the picture I had. The box has the proper part number for their current HP unit, but the unit doesn't match in any other way.
 
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blazinzuk said:
Also a rebuild kit is at least 60 bucks.
Click to expand...

Bent77 said:
At the price summit is offering you’d be money ahead to skip the “needs a rebuild” Craigslist option.
Might be an older series Auburn, but that have a reputation as a good unit
Click to expand...

Points noted. Especially if he's not sure what he has, the truetrac looks like a better option.

So...why is summit specifying different, incompatible bearings?
 
The problem is if you lock your hubs, put it in 4 Hi or will need Hydo streering. ASk me how I know?
 
campfire said:
Points noted. Especially if he's not sure what he has, the truetrac looks like a better option.

So...why is summit specifying different, incompatible bearings?
Click to expand...
Leaving that one for Eric, but I’m wondering if the bearing spec for a rear 10 and front 10 are different. I suspect the trunnions on the case are the same diameter
frankin5 said:
The problem is if you lock your hubs, put it in 4 Hi or will need Hydo streering. ASk me how I know?
Click to expand...
That bad? My sister had one in the front of her YJ and it was “ok”
 
One is likely for the 8.6 which uses larger carrier bearings. One is for the 8.5.

I haven't looked that much into it but there was a different carrier bearing used starting in 99

Don't always believe summits application chart. Right most of the time. But not always
 
blazinzuk said:
One is likely for the 8.6 which uses larger carrier bearings. One is for the 8.5.

I haven't looked that much into it but there was a different carrier bearing used starting in 99

Don't always believe summits application chart. Right most of the time. But not always
Click to expand...

28-spline axles were retired long before 99, so it has to be more than that.

Looks like it's time to compare bearing sizes to nail this down. Somehow there's a $100 difference riding on this minor change. :dunno:
 
campfire said:
A clutch-based posi will have that same problem. I don't want to be dealing with locker steer in both axles (rear is Detroit). So...I'm either stuck with wheel spin or with running selectable, no? Are there other options? :dunno:
Click to expand...
Air or cable locker? Other then that I guess the tru trac is the best option I had on in the rear of my 02 1500 for 200k with no issue just eating bearings bc That rear sux
 
556 and 557 appear to be the same diff. Application charts are the same. On a couple different place even Eaton lists both part numbers as small bore 8.5" 28 spline.

I didn't think you could change the bias in those trutracs but I could be wrong.

No matter what both require special bearings
 
there is a set of bearing to use for the 8.6 which is the standard bearings for the truetrack. The make a set of bearing that fit the 8.6 carrier outside diameter and the inside housing diameter of the 8.5. I am in the process this spring of removing my 30 spline rear Auburn and front 28 spine Auburn with 30 spline front and rear Detroit truetrac. The strange part of 8.5 and 8.6 axles is that the ring and pinion are the same. I will be reusing my 4.56 gears. Truetracks will lock with 1 wheel of the ground, if you set on the brakes. All said and done you can use an 8.6 carrier( with 30 spline axle) in an 8.5, but not vice versa.
 
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I believe the 10b fronts are all 8.6 iirc from my burb research. The 8.5 was the rears in cars.
 
8.5 front and rear to 89 28 spline axle, then went to 30 spline 8.5. The new body style went to 8.6
 
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