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Thread: Compatible transmissions for the M35a3 with the cat 3116

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    Sergeant hornetfan's Avatar
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    Quote Originally Posted by Rambling Wreck View Post
    I think you are mistaken. See the link below.

    http://ep.yimg.com/ca/I/yhst-5952369..._2214_25453689
    Gear Venders makes a planetary geared 0.78:1 overdrive which is pretty short, 12.5" I think, that might work pretty well with a bobbed 4x4 A3 if the wheelbase is 140-150". http://www.gearvendors.com If you're bobber's rear axle is in the same position as the intermediate tandem axle of a 6x6 I think you'll have prop shaft problems even with CV joints. The Gear Venders box is rated for 1200 hp and 30,000 GVW so should be okay with a deuce. Pricey though.
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    Quote Originally Posted by Rambling Wreck View Post
    To my knowledge that is correct.
    According to the TM some are equipped with AT545 and some with AT1545. Other than that I do not know for sure.
    Reno, TX
    '93 M35A3 - soon to be crew cab I hope
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    Quote Originally Posted by duramaxdiesel1 View Post
    i guess i'll be changing mine to atf according to what ive read on here. i was just going by the manual i had for this truck. didnt know you could change to a different fluid. thanks
    I don't know if this has been answered since you posted this but I don't have the time to sit here and read all the posts on this thing, I have a job man! Anyway, the military uses 15w40 in the Allison autos because of the operational environment (combat) doesn't always allow for all different POL (Petrolium, Oil, Lubricants) products to be carried along in case you need it. Also, they don't last that long through military use either. Do yourselves a favor and drain the 15w40, flush it with ATF, and refill it with clean ATF. Allison has its own "ATF" called Transynd, that to the best of my memory the fluid properties of Synthetic ATF & Transynd are similar from when I was a Cat Tech & bumper to bumper diesel tech. Allison dealers will answer questions for you guys if you ask them, so don't be afraid, walk in & pick their brains. Also, good luck with all of your ingenuity!

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    Im new on here but am interested in the allison overdrive transmission. I have read that the transmission itself is programmable. They do not make a non electronic overdrive transmission. It has it's own control module that reads rpm and is not dependent on the ecm of the engine. So a newer allison could be used and as an added bonus you could also have park wich you dont have now.

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    On the M35A3, both the Cat 3116 and the Allison AT1545 are mechanical.
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    Quote Originally Posted by JasonS View Post
    There is a HUGE aftermarket for all variety of things automotive. There are a lot of forums which discuss upgrades using aftermarket parts to go faster in antique vehicles using stock drivetrains or stock suspensions. None of these forums are as paranoid as SS.
    A huge percentage of those aftermarket parts are created and sold for professionally designed, current or recent-engineered vehicles or at least corporate created vehicles with the resources of an engineering department that created and had the government endorse these vehicles. Somebody takes on the liability of those aftermarket items. In contrast, We are a tiny bunch of individuals with an interest in an ex-military, special use vehicle that really never was intended for our pleasure. When we modify these vehicles, we assume the responsibility of mechanical integrity for the parts we create and operation of said parts on what is basically a 60 year old deuce or 5 ton, basically an old farm lumber wagon. There are talented creative people out there that create safe vehicles and then there are other vehicles.

    I don't confuse paranoia with the sentiment of WTF is that piece of $h!T doing on the road as a result of viewing it and having a reaction of thinking abut said vehicle as: it is an obvious disaster waiting to happen. It is just the misfortunes of a few that we do not have access to some military vehicles such as the 151, and for whatever reasons, the ability to have purchased the goat and the now, the HMMWV.
    ,
    It is by tradition and habit from an older generation that we have access to what we can purchase.
    Imagine returning from WWII to an Air Force air field and plopping down $5,000 and having an aircraft gassed up and you are now the proud new owner of it and if you can fly it, off you go. I don't remember who I heard this from but I have no reason to doubt it because it is one of those "in the credible memories" categories.

    I see modifing recent current or antique, corporate vehicles as a different animal that modifing the deuces and 5 tons as treading different waters.
    Fiber in a diet is a good thing!

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    Does any know is the housing to a 1545 an a 545 the same

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    Quote Originally Posted by Gls169 View Post
    Does any know is the housing to a 1545 an a 545 the same
    Yes. There is a front pump difference and torque converter differences is it. They also have the kit to convert one to the other

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    Do u know ware i can get the kit at

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    Wow, this is an interesting thread with a lot of branches. Maybe all parties have found their answers. Seems the consensus is to change axle gearing or use the manual 3053.

    My friend Matt and I have rebuilt one A3 AT 1545 with a melted fourth/reverse clutch pack that will go into the A3 4x4 project I have going. Matt (was) a certified Allison and GM tranny man but is on his own in a small shop now, kinda eccentric.

    Joe brought his tranny up to Matt and again, we have a burned up set of frictions and steels and a ground away aluminum piston on fourth/reverse. This one got metal into the governor and made it turn like it has gravel in the bearing. That had to come from the locking torque converter, given the oil flow path.

    The tranny that is presently in my A3 will be replaced soon with my rebuilt one, so I will have a third 1545 to rebuild (and sell or have to trade).

    Back to the subject of the OP. Matt noticed that almost the guts to an Allison 1545 (and 545) will fit and are the same size as the GM 4L80E and specifically the fourth/reverse clutch is what is called the "direct clutch" of the 4L80E tranny. Matt told me many times that the steel piston with vulcanized seal in the 4L80E had much tighter sealing and better pressure than the Allison Aluminum piston, resulting in greater clamping pressure. Also, the 4L80E has much improved frictions and steels and spring.

    The 4L80E "direct drive" clutch pack is vastly improved and has 40% more clutch surface area....and goes into the fourth/reverse of the Alison that is a major weak link ESPECIALLY FOR HIGHWAY SPEED and more so with higher gears.

    That raises the question I have....is the 4L80E GM with overdrive, a similar and perhaps interchangeably option behind the 3116? I don't know the answer but never saw it mentioned in this thread.

    Think about it....the goal here (of the thread) is more speed and a reduction of rpm, perhaps with an auto or as discussed, the 3053. I want to go 65 and be around 2500 or slightly less. If I keep the 1/1 ratio of the Alison, I have the option of sticking with the 1545 with locking torque converter or change to the 545 relatively easy.

    Now we also have the option of having our locking torque converters upgraded from one to two or three clutch plates, further strengthening what has been viewed as the weak link.

    While my rebuilt 1545 is going into my 4x4 project, the tranny that is in it will be rebuilt next and I will put the 4L80E upgraded steels, frictions, spring and vulcanized piston in it for 40% more clutch area and (guess) 25% more clamp pressure.

    If you are going to get speed by buying Overson gears...this fourth clutch pack upgrade to the Allison is a must in my opinion....and wealthy can that multi clutch torque converter rebuild.

    Plan for the A3 4x4 will add the 2 sets of Overson gears, air locker (rear) and lock out fronts. That's why I call it "money pit".

    Here is one supplier link for the high performance clutch parts

    https://www.transmissioncenter.com/s...rect-hp-64-95/

    https://www.transmissioncenter.com/s...bonded-piston/
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