New update..... she is back to driving on both axles.
Failed to mention we already swapped in an upgraded third member into the front axle (Remember truck is military with AWD and 4x4 ( LMTV M1078) the upgraded third member has a better axle ratio. Not perfect by a long shut but better.... and presently the only other axle ratio available. It came out of an MRAP Caimen.
Will be going to even taller tires (from 46" to 49") to improve ratio even more. More I travel more this will pay for itself by nearly doubling the fuel milage from around 7 to 12 or better. Engine will be in its power band better.
Today after swap of 3rd into new rear axle posted about previously; we finally got her rolling again. Been few hours every Sat. night for a while. Axle is mounted she drives. Rear 3rd has matching ratio to front as well as a Mechanical Locker.
As mentioned previously.... this axle is actually out of a 6x6 AWD truck. Using this axle cause it moves the drive shaft from a somewhat steep angle up to almost parallel to chassis. Military did the same design swap around 2007? in all their AWD- LMTV's as well. ..... Anyway... this particular axle normally has another axle behind it. It is the first axle in 6x6 rear pair. The big ol' chunk above attaches to axle pumpkin... and it houses a differential between the two axle outputs. Like any differential it will send power to the unit with the most slip..... well with no second axle attached.... it will mechanically feel like that missing axle is in massive slip.... so it will send all power to the output for the ahhh.... missing axle........ OOPS... now one has no power to existing rear axle..... NO problem though... this rear axle has a locker on that differential that normally sat between the two rear 6x6 axle. Just gotta lock that locker permanent.... Which we did.... we mechanically activated the air solenoid that normally locks it.
An air solenoid has a piston in it that holds the locker .... locked. We decided to hold that piston in place by taking an extra air fitting drilled and tapped then run piece of all-thread rod into the solenoid thru its original air fitting ... along with a lock nut. Turned in the all thread rod to push the piston home. Will get updated though. Before making final decision on what will hold it home permanent am going to check with Meritor to see if they will clue me in on make up of piston (Cast hollow or solid milled, steel or aluminum, etc.)
Drive shaft shortened by about 2 inch if I recall right. Rebalanced in process.... though it was already a new shaft (NOT.... NOS but brand newly constructed)
Still got little more to do....
. Airline brackets for all the airlines
. Sway bar brackets as well as make up some bushings for sway bar affix to axle. (nylon rod stock milled out is the plan). Have new sway bar bushings for other points.
. Breather line- This one has slightly different location for axle breather so need to make new line for that.
It seems to never stop lol.... but then again all these little things would be same no matter how did this install.. Could have done this by flipping my orginal 4x4 axle housing and then installing the 6x6 3rd into that... or modify an all New axle like done here. More on the modifications we did are in previous post in this thread. A flipped 4x4 axle housing still think would be more time consuming cause would have to make a completely new spring perch pads as well as all the other tid bits having to do to this one as well.. Anway.... some of the little things still do go....
. Making up bracket and hooking up the brake load adjuster is another task to do as well.
. Final shim to go under leaf springs to rotate axle to match axle angle to tranny output angle (seeking perfect parallel between two). Right now we are little over 1-ish degree off. This will be made after the Ambo box is installed and she sits closer to normal weight thus normal squashing of the suspension. Will then see where we are and how much shim to make.