LOST JEEPS :: View topic - ARB or DTT in the rear

If memory serves, GM's first use of a Torsen unit was in the transfer case. They used Detroit locker in front, with manual locking hubs, clutch pack Posi in the rear, and Torsen in the transfer case.

GordnadoCRD wrote:

I've had 2.

Neither came from the factory that way.

GM is not dumb enough to put a auto locker like a Detroit in the front diff and expect everyone that may drive it know they can't use 4wd unless in the most extreme loose conditions otherwise you will not be able to turn.

GordnadoCRD wrote:

I've had 2.

Mountainman wrote:

Since you put kilometers, I assume that you're in Canada? How is that lockright on an icy corner in winter? My vote is an OX in the rear, but auto lockers are amazing if the downsides don't make them a poor option. I've had an Aussie locker in the front (old 4 runner), and other than the fact that you could not be in 4wd on pavement, it was amazing in deep snow on steep mountains, and elsewhere too.

Yup - BC, Canada. I'm about 30-40 miles west of Bellingham WA.

IMO, the icy-corner front-locker winter thing is a joke. Learn to operate your equipment. You let off the throttle to get your steerage back... and highways aren't curved enough anyway. I've driven to Fort Nelson and back in January. Routinely take the Coquihalla to the interior in winter months. The few scary moments I've had are from pushing 2wd too far. (overly concerned about part-time tcase :roll:

) I don't do that anymore. 4wd gets used when there's any ice/snow, or its freezing. Could be 60mph on a sunny winter day with ice patches... or gently chugging along at 20mph during a white-out snowstorm.

Mountainman wrote:

u2slow wrote:

My Dodge has a Lockright (rear) and I drive it daily. The KJ has a stock posi, and its driven daily.

Personally, I would have a really hard time going to an open diff again (i.e. ARB off). I've gotten used to having traction by default... not something I have to turn on for special circumstances. I don't like DD'ing with a spool either.

Since you put kilometers, I assume that you're in Canada? How is that lockright on an icy corner in winter? My vote is an OX in the rear, but auto lockers are amazing if the downsides don't make them a poor option. I've had an Aussie locker in the front (old 4 runner), and other than the fact that you could not be in 4wd on pavement, it was amazing in deep snow on steep mountains, and elsewhere too.

darn thats right, I forgot we had this discussion about the OX locker not that long ago. I think they have one for the 8.25 and D30, but because the D30A was a different cover so it wouldnt work.

tjkj2002 wrote:

GordnadoCRD wrote:

I've had 2.

Both came new from the factory that way.

Neither bought second hand. Both were in the family ranch from new.

Both GMC. Both 3/4 ton 4x4

The 1956 came from the factory with GM spec'd Napco drivetrain

The 1963 came from the factory with GM original drivetrain.

Both came with Detroit Lockers up front.

Both would snap and bounce the front like hell if you forgot to take the manual hubs out before going around corners on pavement.

{Edit} Biggest difference between then and now... If you screwed up like that now, stuff breaks. Usually, expensive stuff.
Back then it just beat the crap out of you till you turned the hubs out.

My buddy had an old CJ and it came with a select-able locker up front that was vacuum actuated. I've seen several other (non-jeep) 4x4s that also used a vacuum actuated locker in the front diff.

flash7210 wrote:

My buddy had an old CJ and it came with a select-able locker up front that was vacuum actuated. I've seen several other (non-jeep) 4x4s that also used a vacuum actuated locker in the front diff.

A lot of the early IFS 4x4's had vacuum actuators on one of the front drive axles to engage four wheel drive. 80ish GM's come to mind like S10's and such. Most later on went to electric actuators like what is on my Dodge 4X4's... :wink:

Author:	tjkj2002 [ Thu Oct 26, 2017 11:08 pm ]
Post subject:	Re: ARB or DTT in the rear
GordnadoCRD wrote: I've had 2. Neither came from the factory that way. GM is not dumb enough to put a auto locker like a Detroit in the front diff and expect everyone that may drive it know they can't use 4wd unless in the most extreme loose conditions otherwise you will not be able to turn.

Author:	mass-hole [ Fri Oct 27, 2017 9:13 am ]
Post subject:	Re: ARB or DTT in the rear
GordnadoCRD wrote: If memory serves, GM's first use of a Torsen unit was in the transfer case. They used Detroit locker in front, with manual locking hubs, clutch pack Posi in the rear, and Torsen in the transfer case. I know the trailblazer SS has a Torsen center diff Sent from my iPhone using Tapatalk

Author:	u2slow [ Fri Oct 27, 2017 3:23 pm ]
Post subject:	Re: ARB or DTT in the rear
tjkj2002 wrote: GordnadoCRD wrote: I've had 2. Neither came from the factory that way. GM is not dumb enough to put a auto locker like a Detroit in the front diff and expect everyone that may drive it know they can't use 4wd unless in the most extreme loose conditions otherwise you will not be able to turn. Back when you could order it any way you wanted (50's/60's) these nameplates were used when you optioned the Detroit.

Author:	GordnadoCRD [ Fri Oct 27, 2017 6:24 pm ]
Post subject:	Re: ARB or DTT in the rear
tjkj2002 wrote: GordnadoCRD wrote: I've had 2. Neither came from the factory that way. GM is not dumb enough to put a auto locker like a Detroit in the front diff and expect everyone that may drive it know they can't use 4wd unless in the most extreme loose conditions otherwise you will not be able to turn. Both came new from the factory that way. Neither bought second hand. Both were in the family ranch from new. Both GMC. Both 3/4 ton 4x4 The 1956 came from the factory with GM spec'd Napco drivetrain The 1963 came from the factory with GM original drivetrain. Both came with Detroit Lockers up front. Both would snap and bounce the front like hell if you forgot to take the manual hubs out before going around corners on pavement. {Edit} Biggest difference between then and now... If you screwed up like that now, stuff breaks. Usually, expensive stuff. Back then it just beat the crap out of you till you turned the hubs out.

Author:	Mountainman [ Sun Oct 29, 2017 10:13 pm ]
Post subject:	Re: ARB or DTT in the rear
u2slow wrote: Mountainman wrote: Since you put kilometers, I assume that you're in Canada? How is that lockright on an icy corner in winter? My vote is an OX in the rear, but auto lockers are amazing if the downsides don't make them a poor option. I've had an Aussie locker in the front (old 4 runner), and other than the fact that you could not be in 4wd on pavement, it was amazing in deep snow on steep mountains, and elsewhere too. Yup - BC, Canada. I'm about 30-40 miles west of Bellingham WA. IMO, the icy-corner front-locker winter thing is a joke. Learn to operate your equipment. You let off the throttle to get your steerage back... and highways aren't curved enough anyway. I've driven to Fort Nelson and back in January. Routinely take the Coquihalla to the interior in winter months. The few scary moments I've had are from pushing 2wd too far. (overly concerned about part-time tcase ) I don't do that anymore. 4wd gets used when there's any ice/snow, or its freezing. Could be 60mph on a sunny winter day with ice patches... or gently chugging along at 20mph during a white-out snowstorm. Wow, thanks for the report! Now it's OX or Detroit locker for the rear in mine. At 200k I think I'll replace and upgrade the gears anyhow, so it just comes down to cost and popping sounds driving me crazy. It would be pretty cool to have the traction of the lunch box locker all of the time vs the selectable.

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Author:	Mountainman [ Sun Oct 29, 2017 10:18 pm ]
Post subject:	Re: ARB or DTT in the rear
mass-hole wrote: Mountainman wrote: u2slow wrote: My Dodge has a Lockright (rear) and I drive it daily. The KJ has a stock posi, and its driven daily. Personally, I would have a really hard time going to an open diff again (i.e. ARB off). I've gotten used to having traction by default... not something I have to turn on for special circumstances. I don't like DD'ing with a spool either. Since you put kilometers, I assume that you're in Canada? How is that lockright on an icy corner in winter? My vote is an OX in the rear, but auto lockers are amazing if the downsides don't make them a poor option. I've had an Aussie locker in the front (old 4 runner), and other than the fact that you could not be in 4wd on pavement, it was amazing in deep snow on steep mountains, and elsewhere too. darn thats right, I forgot we had this discussion about the OX locker not that long ago. I think they have one for the 8.25 and D30, but because the D30A was a different cover so it wouldnt work. Yeah, and the OX have a much better design in my opinion.

Author:	flash7210 [ Mon Oct 30, 2017 8:36 am ]
Post subject:	Re: ARB or DTT in the rear
GordnadoCRD wrote: tjkj2002 wrote: GordnadoCRD wrote: I've had 2. Neither came from the factory that way. GM is not dumb enough to put a auto locker like a Detroit in the front diff and expect everyone that may drive it know they can't use 4wd unless in the most extreme loose conditions otherwise you will not be able to turn. Both came new from the factory that way. Neither bought second hand. Both were in the family ranch from new. Both GMC. Both 3/4 ton 4x4 The 1956 came from the factory with GM spec'd Napco drivetrain The 1963 came from the factory with GM original drivetrain. Both came with Detroit Lockers up front. Both would snap and bounce the front like hell if you forgot to take the manual hubs out before going around corners on pavement. {Edit} Biggest difference between then and now... If you screwed up like that now, stuff breaks. Usually, expensive stuff. Back then it just beat the crap out of you till you turned the hubs out. Makes sense when you have manual locking hubs. With auto-locking hubs or fully locked hubs, a detroit locker up front would be awful. My buddy had an old CJ and it came with a select-able locker up front that was vacuum actuated. I've seen several other (non-jeep) 4x4s that also used a vacuum actuated locker in the front diff.

Author:	WWDiesel [ Mon Oct 30, 2017 9:12 am ]
Post subject:	Re: ARB or DTT in the rear
flash7210 wrote: My buddy had an old CJ and it came with a select-able locker up front that was vacuum actuated. I've seen several other (non-jeep) 4x4s that also used a vacuum actuated locker in the front diff. A lot of the early IFS 4x4's had vacuum actuators on one of the front drive axles to engage four wheel drive. 80ish GM's come to mind like S10's and such. Most later on went to electric actuators like what is on my Dodge 4X4's...

Author:	mass-hole [ Mon Oct 30, 2017 10:58 pm ]
Post subject:	Re: ARB or DTT in the rear
WWDiesel wrote: flash7210 wrote: My buddy had an old CJ and it came with a select-able locker up front that was vacuum actuated. I've seen several other (non-jeep) 4x4s that also used a vacuum actuated locker in the front diff. A lot of the early IFS 4x4's had vacuum actuators on one of the front drive axles to engage four wheel drive. 80ish GM's come to mind like S10's and such. Most later on went to electric actuators like what is on my Dodge 4X4's... Ford still uses vacuum hubs, at least on the F150/expedition. Not sure on the 250 or 350. Sent from my iPhone using Tapatalk

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