M923a2no reverse when in low range

[Hoefler]

Trucks runs and shifts perfect, except when in low range. Put it in low with front end locked in. Had to back up a bit to make a sharp turn, but found while in low range, the truck would not go in reverse. It feels like something is preventing shift arm from traveling.
When I put the truck in high range, and regained full shifter range. My truck has painted stencils on each door warning to not put truck in reverse while in low range. While I am aware of the transfer case weakness, reversing with no load other than simply moving truck in reverse on flat ground would not be adding any more force into transfer case as compared to low rpm while reversing in high range.
so, two things- never ever reverse in low range? Has anybody else experienced no reverse while in low range?
My A0 does not do this.
pete

 

[Gunzy]

I believe there is a lock out to prevent reverse in low range. Mine will not go into reverse in low either and it is a '84 m923(A0) also. I do think it is a safety feature that can be bypassed.

 

[machinist75]

Yes I've seen some that are, and others that aren't.

 

[leo4x4]

in my truck there is a tag on the driver front door that says do not put in reverse while in low range

 

[61sleepercab]

My 1984 M925 will not shift into reverse in low range . Speed tag on dash says reverse in low range is a no no. Some one said to prevent transfer case trouble. Mark

 

[5tonman1971]

Could have been disabled so an 18 year old pvt didn't jump in it an blast the transfer case out from underneath it

 

[Scar59]

A lot of drivers ignored the speed data plate warnings and a lot of transfer cases needed replacement. Many trucks were then modified to prevent rev. in low. There is a updated trans linkage kit available. I'll try to find the number for the kit.

 

[jcappeljr]

I have a trans,$500

 

[doghead]

Just have to add, have you ever read the -10TM?

 

[wheelspinner]

The problem with running a truck in "judgement zone" territory like this is, you will never know when the design limit is reached until its too late. Think of it like stretching out one of those little springs in a click-pen. Pull a little further each time and it springs back, then all of a sudden it doesn't. You couldn't tell that you were crossing the treshold until it was too late. Although it seems like an easy move would have no consequences, if you never push the "line" you can never have one of "those" moments. If you need to move it in low-reverse, but don't need the front drive, bypass the front axle auto-lock and disengage the front axle. VERY easy to do.

 

[Hoefler]

Just have to add, have you ever read the -10TM?

Yes I have read-most-of the TM's on this truck. I understand torque too.
It appears some trucks have a prevention switch and others don't.
Having the transfer case vendor provide a product that allows reverse in low gear is a pretty basic requirement. If any consumer products, like pick up trucks suffered this problem, it would have been corrected quickly.
Other peoples money sure is different than one's own.
Pete

 

[doghead]

These trucks were purpose built for the government/military to their specs. They(A2) were modified to the military's specs.

They were never meant to be manufactured in compliance with civilian use/standards.

 

[armytruck63]

Reverse high range is still a pretty low gear anyway, as I found out when I had to back up about 500 feet due to a locked gate.

 

[chadande]

My A2 backs up fine in both high and low range. Must be a different linkage with a "safety" to prevent damage.