Locker or LSD?

[truckster]

I know it's a tired subject, but I've searched and I'm not sure I've found the right answer yet.

My Blazer originally had a gov-lock differential, until it blew up and took the housing with it. I replaced it with an open 12 bolt, but I'd like to upgrade it. I'd like to keep the cost down. I don't do much offroad driving, but I do drive in the snow. My Blazer has a warmed-up L31 Vortec and TH350 transmission. The gear ratio is 3.73:1 and I'm running 33x12.5 BFG All-terrain tires.

I'm leaning toward the Yukon Gear YDGGM12T-4-30-1.

Your advice is appreciated.

['68OrangeSunshine]

Originally Posted by truckster

I know it's a tired subject, but I've searched and I'm not sure I've found the right answer yet.

My Blazer originally had a gov-lock differential, until it blew up and took the housing with it. I replaced it with an open 12 bolt, but I'd like to upgrade it. I'd like to keep the cost down. I don't do much offroad driving, but I do drive in the snow. My Blazer has a warmed-up L31 Vortec and TH350 transmission. The gear ratio is 3.73:1 and I'm running 33x12.5 BFG All-terrain tires.

I'm leaning toward the Yukon Gear YDGGM12T-4-30-1.

Your advice is appreciated.

My '71 GMC Jimmy K/1500 originally came with the RPO G80 Eaton PosiTraction. I don't know the p/n. They are rebuildable, and should fit your carrier.
My drivetrain is: V8 350/SM465/NP205/12 Bolt 3.73 Posi and 33x12.50x15 tires.
[No limited slip in the front end D44.]

[chevmn]

Several years ago I was wanting to upgrade my open differential and had about decided to buy a Powertrax Lock-Right (Summit and others sell). Easy install, but I have no personal experience with. Perhaps someone can add their experiences. I never purchased one, as I traded trucks and the truck I purchased had a G80. I can add that I really not all that fond of the later "ratcheting" type lockers such as in my later model pickup.

[MS66]

Originally Posted by truckster

I know it's a tired subject, but I've searched and I'm not sure I've found the right answer yet.

My Blazer originally had a gov-lock differential, until it blew up and took the housing with it. I replaced it with an open 12 bolt, but I'd like to upgrade it. I'd like to keep the cost down. I don't do much offroad driving, but I do drive in the snow. My Blazer has a warmed-up L31 Vortec and TH350 transmission. The gear ratio is 3.73:1 and I'm running 33x12.5 BFG All-terrain tires.

I'm leaning toward the Yukon Gear YDGGM12T-4-30-1.

Your advice is appreciated.

I used the equivalent of that diff in my '97 Tahoe for years after pulling the original G80 gov-lock out. Did fine.

[Extended Power]

I have used the Detroit Tru-Trac in my 800rwhp diesel, my Son’s 400+hp Buick Stroker, my S10 ZR2, and my ‘70 GMC truck.
Never had an issue with any of them.
They are quiet, and just flat out WORK!
No clunking around corners, no special friction additives required, no clutches to burn out, no springs to break.
In my opinion, there is only the TRU-TRAC for street/strip, and everything in between.

[LS short box]

I also have used the Tru-Trac in a few hot rod projects and they have worked flawlessly.

[Already Gone]

I'll concur on the Tru-Trac. Put one in my 72 C10 and you don't know its there till its needed. Even going through a tight right hand merge from one street to the other and on dry pavement you can feel the Tru Trac keeping the power even on both rear wheels. Put one in my 1992 K1500 Suburban with manual on the floor 4 x 4 selector as well and since doing that rarely have to put it in the 4 x 4 mode even in snow. Not the cheapest but in my opinion the best and have never heard a bad word about them.

https://www.eaton.com/us/en-us/catal...ferential.html

[1970 CST Short Wide]

Originally Posted by Extended Power

I have used the Detroit Tru-Trac in my 800rwhp diesel, my Son’s 400+hp Buick Stroker, my S10 ZR2, and my ‘70 GMC truck.
Never had an issue with any of them.
They are quiet, and just flat out WORK!
No clunking around corners, no special friction additives required, no clutches to burn out, no springs to break.
In my opinion, there is only the TRU-TRAC for street/strip, and everything in between.

I replaced my Detroit Locker with the Detroit True Trac and love it. Works flawlessly and it’s quite

[truckster]

How complicated is the set-up on the Truetrac?

[Richard]

The Trutrac is a gear type diff and works good on the street and many off road situations. Just be aware that if one wheel has no traction at all (like lifting a wheel or ice) it acts like an open diff. Setup should be no different than any other carrier.

[special-K]

I've used the TruTrac in many trucks and those are great. You also have Auburn Gear for a stout limited slip. One I never used because I always ran tires too big but would really like to run is Gleason Torsen. Those seem really cool. When one will starts to spin faster power increases to the wheel with traction. The opposite of an open rear. The good wheel spins, not the wheel in trouble https://torsen.com

[72SB]

If I did a posi, it would be the Eaton with 400lb clutch disc springs. They are rebuildable, Auburn is not.

[truckster]

I have Auburn units in both my Camaros. They work well for their purpose, but the Camaro is obviously not a snow vehicle.

I just pulled the trigger on the TrueTrac. I'm aware of the fact that it will spin if one wheel has no traction, but I believe that can be handled with judicious application of the brakes.