How many lockers to use for a 6WD M1088?

[Reworked LMTV]

Should I use 1 locker or 2 lockers at the rear of an m1088? If only 1, which set of wheels would you put it on?

 

[porkysplace]

If only 1 use the middle axle.

 

[scottmandu]

If you go with one put it on the axle that is always driven.

 

[coachgeo]

never mind. already answered

 

[FMTV Truck Sales]

Depends if you want "incredibly capable" or "virtually unstoppable"

The only downside to putting a locker in the intermediate is the very large tire marks left when turning on concrete and maybe some accelerated tire wear. Placing in the rear gives you a select-able locker because it will only be engaged in MODE.

We've installed many in each position with positive results from both.

Using 2 rear lockers would get you "virtually unstoppable".

 

[coachgeo]

Depends if you want "incredibly capable" or "virtually unstoppable"

The only downside to putting a locker in the intermediate is the very large tire marks left when turning on concrete and maybe some accelerated tire wear. Placing in the rear gives you a select-able locker because it will only be engaged in MODE.

We've installed many in each position with positive results from both.

Using 2 rear lockers would get you "virtually unstoppable".

well??? for clarity since you folk hear know loads more than I do... if it is in rear most is it not more semi-selectable than a true selectable? As in; when NOT in off road mode doesn't the differential inside the power divider have both rear axles available but sends torque to which ever has most slip. If the Detroit locker is in either axle.... one that it is in, most likely will NOT be the one to slip the most so it won't get sent the most torque but may get some. So in a way.... as you say.... with Detroit locker in rear axle..... it will rarely get sent majority of torque, if at all. Yet will get the scrubbing you describe since Detroit locker always is active at some level, rather the axle in it is getting sent any power or not. Granted both axles will always will get half of torque each in Mode and the Detroit will get maximal use.

So with those points; splitting hairs... doesn't this makes it more semi-selectable??

Unless of course on these trucks it does not work that way and the power divider completely disconnects the rear most axle and it just hangs out there like a Tag axle till Mode is activated and they get locked together.

 

[FMTV Truck Sales]

The power divider completely disconnects the rear most axle until MODE is activated and the two axles get locked together...and if locker is installed in rear most axle, you now have semi-select-able locker.

 

[coachgeo]

The power divider completely disconnects the rear most axle until MODE is activated and the two axles get locked together...and if locker is installed in rear most axle, you now have semi-select-able locker.

ahhh.... so there is NOT a differential inside the power divider?

 

[FMTV Truck Sales]

 

[FMTV Truck Sales]

 

[Suprman]

I always though the rear axle was driven thru the power divider and the center axle was engaged in mode. If this is the case then a locker in the middle axle is the way to go.

 

[scottmandu]

I always though the rear axle was driven thru the power divider and the center axle was engaged in mode. If this is the case then a locker in the middle axle is the way to go.

According to Dana and Meritor literature (not specifically to the RF611 axles), both rear axles are always powered speed is allowed to vary via an inter axle differential. When engaged the power divide will lock that differential.

https://www.quora.com/Which-axle-drives-a-tandem-truck

Being there is an inter axle differential in the middle axle of the MTVs, I would say they also function similarly (number 38 in sheet 2 illustration).

 

[DiverDarrell]

Someone needs to pull the rear tires off a 6x6 and see if it will drive or act like it’s missing a drive shaft.

 

[coachgeo]

According to Dana and Meritor literature (not specifically to the RF611 axles), both rear axles are always powered speed is allowed to vary via an inter axle differential. When engaged the power divide will lock that differential.

https://www.quora.com/Which-axle-drives-a-tandem-truck

Being there is an inter axle differential in the middle axle of the MTVs, I would say they also function similarly (number 38 in sheet 2 illustration).

34 thru 36 appears to be the air piston that activates fork #41 which somehow along with 40 and 39 locks up 38... aka the interaxle locker

 

[Suprman]

Simp was towing a m1083 he pulled the rear most driveshaft and the rear transfer case output was slowly spinning with the engine running and the truck in N.

 

[coachgeo]

Simp was towing a m1083 he pulled the rear most driveshaft and the rear transfer case output was slowly spinning with the engine running and the truck in N.

Sentence could be read different ways. So for clarity; are you saying it would spin while sitting going nowhere ..... or that it would spin while it was under tow? (In Neutral)

 

[Suprman]

It spun white sitting in N and the truck not moving. With the rear most driveshaft disconnected. Not uncommon, but it give the appearance that the middle axle was not engaged.

 

[coachgeo]

It spun white sitting in N and the truck not moving. With the rear most driveshaft disconnected. Not uncommon, but it give the appearance that the middle axle was not engaged.

middle axle not engaged sounds right cause the Power Dividers differential would send all torque to the spinning axle and not having a driveshaft there it would sense that the rear most axle was spinning like crazy. Thus no torque sent to middle axle and all of it to the crazy spinning one.

BUTTT the "N" part throws all that out the window..... that makes no since at all unless there was a transmission problem and "N" was not actually "N". Well... guess it could have just been natural frequency resonance causing it so spin lightly. Matters how fast it was turning and how much torque it had I guess. Isn't there a thread or some post in here on that event somewhere?

 

[Reworked LMTV]

So for a vehicle that is driven a lot on the highway, a locker in the rear is likely the best because the rear only locks when it is activated by operating in MODE? And there would be reduced tire wear?

We need more snow videos of 5 ton trucks to look at what it does when it slips : )

 

[Suprman]

I say middle axle