Ecscnvb
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What are u doing with the truck when they break?
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M923a2 Low range reverse
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Some are hooked to tub grinders. Others were fuel tankers, others were just crossing fields traversing thick nasty mud. There is no quality assurance in the government.
Better case to go to is the direct drive T138s in the 809 series trucks and just plumb in an air direct fornthe sprag. Its a straight thru shaft case unlike the 1138 has an offset output. The direct drive case would be well for a 13spd or a higher od manaul trans or an Allison 4070p that has basically double overdrive. I have not found a stronger transfer case that offers an OD high range.
I am actually going to go with a HEMTT case and repower the truck and up the tire size.
The 8.3s are well suited for the higher rpms of a direct drive case with an OD transmission.
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You asked for opinions, my opinion is ignore Simps opinion, you’ll be fine!!!
Another opinion with no basis
, is when you think your stuck in an A2 and your wheels wont spin in 1rst gear high range, put the pedal to WOT and wait for 5-10 seconds, the turbo will “usually” spool the motor up past the stall speed...That washer is there for automatic engagement of the front axle in low range. They have a low range lockout that will not let you reverse in low range at all.
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Ecscnvb
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Then your didn't get the MWO for the lockout is all.
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This has to be frustrating to you guys! I know i would not want to be without low reverse in my M series trucks. We have never failed a transfer in hard conditions. I am a design engineer but I have had much experience as an equipment and vehicle operator and mechanic as well. That experience is priceless and should be applied to the design or specifications of the trucks. The design or specification for design should not be entrusted to a freshly minted college grad that has no practical experience driving them in all conditions. Design input should come from guys like you all who have driven this type of truck and from the mechanics that have worked on trucks for many years. It is like when my son worked for the state highway as a mechanic. They had steel fuel tank straps on the trucks that rusted through from the road salt very soon, dropping the tank one end usually at the most inconvenient times. When the guy that wrote the specifications visited the garage for a talk about improvements my son said make the fuel tank straps out of stainless. The specifications wizard replied by asking "What is a fuel tank strap?!" Looks like here with the 900 series they went away from the redundant support systems on tactical trucks like the M and 800 series capable of getting your rear end out of the combat zone with some systems inoperable to an on- road computer system dependent truck with front wheel assist. I do not mean to be offensive or stepping on toes, just explaining why I will never own one.
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High reverse is still plenty low. The problem is that if you're crawling around in low range forward and have to back up it adds a step to have to shift the transfer.
The OP seems to be looking for a way to resolve this. There isn't one, short of replacing the t-case.
The OP seems to be looking for a way to resolve this. There isn't one, short of replacing the t-case.
Two Stroke Madness
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Does anyone happen to have a picture of a cracked T1138 transfer case that they would be willing to share?
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Mine never had the lockout installed either, I used a wiz wheel and cut the part of the washer so it misses the switch, no disassembly required, and just rotate the washer, if for some reason you want it to auto engage again...
Ecscnvb
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Ecscnvb
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Some say if the front axle is disengaged then it's ok
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Personally, I like the idea of removing the washer and makING the front axle engage only by the switch on the dash. That gives you high 6, low 6, high 4, and unlike stock trucks it also gives you low 4.
And running low range 4 in reverse would seem to me to place less strain on the transfer case than low range reverse 6.
However, less stress is not the same as tolerable stress.
"Some say".... let's see them demonstrate it. Condition's as follows - dry pavement, pulling another 5ton with engine off and springbrakes engaged. If it does not break, then at that point I'll be convinced. (That isn't a very demanding test either, in the scheme of things )
Ecscnvb
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Ecscnvb
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That'll ruin ur day.
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Two Stroke Madness
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Is it just me, or does that look like a very solvable problem? Do they always crack in that same location?.
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So, you can't lock the front end in low range reverse in the A2 series trucks? Mine doesn't have any kind of warning plate or lockout as far as I know. Is the HEMMT transfer case a direct replacement or require modification? Does it solve the breakage issue?