Rear diff, 2wd, no G80.
Ox Locker in GMT900 with 3.42 gears?
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Yes, if I'd gone the 4wd route, I'd definitely opt for 3.73's at a minimum. This would be an occasional off-road enhancement for my 2wd. It is what it is for now.
the eaton tru trac should be fine in almost all cases, it's bullet proof that's for sure. (I haven't broke one yet lol) but have broken plenty of g80's
but for a definitive answer you might try reaching out to filthy motorsports I have had there page saved forever for referencing what can be used and what is available
based on the axle/gearing etc they show the OX as a option for "some"
GM 8.5" and 8.6" Axle Parts, Gears, and Upgrades
Filthy Motorsports carries a wide range of parts, gears, and upgrades for the GM 8.5" and GM 8.6" axles including ring and pinion sets, rebuilt kits and bearings, differential covers, upgraded axle shafts, heavy duty u-joints, and more.
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Hmm. I was pretty sure I'd thoroughly checked out the Eaton Tru Trac, but I was thinking it was an auto-locker, which I didn't want for certain situations. Now that I see it is NOT, and is a unique limited slip, I may need to take another look at it. Thanks.
I'll def check out Filthy Motorsports.
I referenced them because of the information there page shows and usually video's on various products with a in-depth look at how they work
strutaeng
Full Access Member
I think a selectable locker is better for more aggressive off-road use, like a dedicated (or not) trail rig. Why? Because it locks the rear axles so they spin 1:1.
The LSD have some slip between the axles, which is fine daily driving and some mild off/moderate off-road use.
I forget what the Detroit Truetrac is, but I want to say it's an LSD(?) There's different types of LSD mechanism and that particular one is a "Thorsen"-type LSD. The Thorsen differential require you to apply the brakes momentarily if one wheel is in the air to engage, otherwise if behaves like an open differential until you force one wheel to stop.
Probably doesn't matter OP, but you may want look into the differences.
This video I think covers that:
The LSD have some slip between the axles, which is fine daily driving and some mild off/moderate off-road use.
I forget what the Detroit Truetrac is, but I want to say it's an LSD(?) There's different types of LSD mechanism and that particular one is a "Thorsen"-type LSD. The Thorsen differential require you to apply the brakes momentarily if one wheel is in the air to engage, otherwise if behaves like an open differential until you force one wheel to stop.
Probably doesn't matter OP, but you may want look into the differences.
This video I think covers that:
I had forgotten about the Torsen design, I've seen videos in the past about how it's used on military vehicles and read about how unique it is. I'm def considering this option more now. We'll see. Don't mind the idea of it always working on its own and it doesn't hurt that it's a good bit cheaper than the Ox as well.
Yes, you're right about the Torsen/Thorsen design. That's pretty interesting. I'm researching the pros and cons of both now. Thanks for the vid.
strutaeng
Full Access Member
Yes. Pretty interesting indeed.
Honestly, they all have pros and cons. On the selectable locker where they lock 1:1, you can't really steer or turn, because both wheels are turning at the same rate. Going around a corner, the wheels would bind if they have good traction.
Similar to the guys that would weld their spider gears on a daily driver. Not sure why anyone would do that for a daily driver. Driving around a parking lot you have a lot of tire screeching. I guess if you are really poor and have a welder, then everything looks like a nail...-type of thing?
I'm sure you be happy with the Thorsen LSD for your application.
@strutaeng
That's an excellent video. Thoroughly informative yet not too long and drawn out. I've seen it before years ago but forgot how good it was. Looking into a TrueTrac at this point and possibly re-gearing to 3.73's.
I've heard/read many say that's a pointless re-gear - if you're gonna do it, might as well go up to at least a 4.10 - but I think for my application it'll be well worth it.
It's a 2wd DD that just needs a little traction enhancement and some more oomph for the local hills around town. 3.42's are pretty disappointing, I can't believe they're putting even more anemic gearing than that in many trucks today. 3.23's, 3.08's, etc.
There are a number of other ways they could improve MPG without robbing a truck's torque output.
That's an excellent video. Thoroughly informative yet not too long and drawn out. I've seen it before years ago but forgot how good it was. Looking into a TrueTrac at this point and possibly re-gearing to 3.73's.
I've heard/read many say that's a pointless re-gear - if you're gonna do it, might as well go up to at least a 4.10 - but I think for my application it'll be well worth it.
It's a 2wd DD that just needs a little traction enhancement and some more oomph for the local hills around town. 3.42's are pretty disappointing, I can't believe they're putting even more anemic gearing than that in many trucks today. 3.23's, 3.08's, etc.
There are a number of other ways they could improve MPG without robbing a truck's torque output.
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