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Thread: M35A3 tire changing to 395/85/20 part 1

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    Colonel BadMastard's Avatar
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    Default M35A3 tire changing to 395/85/20 part 1

    Ok, not so much a question, as a new thread about changing tires and my lovely experience with them.

    First off, bought 8 395's out of texarcana mounted on 10 lug hemmt wheels. The goal is to have these tires on my m35a3 for two reasons. One, improve top speed about 5 mph. It will make driving here on the roads slightly less aggravating to those behind me, and let me cruise the interstate at a slightly lower RPM. Two, they look REALLY good!

    Decisions- chose to use m35a3 rims to mount the tires rather than recenter hemmt. That might change, but I want to see the results of mounting on the a3 wheels first.

    Chose to try "Field Expedient Tire Changes"- meaning I do have a 1/2 inch air impact wrench. Backup is a 1/2 inch electric impact, and a crowbar (tire iron) and many sockets. You need 15/16ths on the rim nuts for the hemmt wheels. You need 1 1/8 for the rim nuts on the m35a3 wheels. You will probably need a 4 foot breaker bar and a friend or two somewhere down the line. I tried to use minimum tools, as if it was a field tire change.

    Job one- separate the hemmt wheels from the tires. First off, my air compressor wouldn't turn the rim lugs. Not even a little, and it's a 12 gallon 8.9 cfm 4 hp at 125 psi. Nothing. Gun rated at 500lbs, suspect it's more like 250. Out goes the air wrench. Turned a couple by hand. Needed a 2 foot breaker bar, but it works. Note to self, self locking nuts are tight to break loose, and stay tight. Tried wd-40, PB blaster and pure silicon spray. Not much help. Tried wire brushing studs. Not much help, but some. Especially on the carc covered studs.

    Ok, you CAN loosen the rim nuts by hand. Went to electric wrench rated at 365 ft lbs. That turns them, barely. Plan on cooling it down every 2-3 nuts.

    So, first tire, rolled into position, and I hear water sloshing around in it. Yep, 10 gallons of it, as measured later. Makes the heavy tire even heavier. tTre is propped against other tires at a 45 degree angle, and remove all rim nuts. Done. Now, break seal on tire. This is simple, if muscle intensive. Take tire iron and work it ALL the way down between the tire from bead area on rim. Push and pull a bit on the iron, it will move "slightly". Move 4 inches further, repeat. and repeat. And repeat. Add copious amounts of soapy water, I just hung a rag soaked in it on the edge of the tire dripping down into the bead area. Wheel will "pop" and move freely. Lift off first piece of wheel.

    Flip tire over and lean at angle against other tires. Repeat tire iron trick until the rim pops off tire. Now is the hard part, you have to evenly remove the rim until you get it to bind on the tire valve, which it will. You can either wiggle it past (sometimes) or you can take your tire iron and lift the edge just a fraction and it will slide out. You have now removed a tire from a wheel.

    Warnings- Every single part of this operation involves something heavy. Please use caution.

    Make sure your tire iron had no burrs or sharp edges- it will scratch things you don't want to scratch.

    Locking nuts do NOT release easy, your impact wrench is getting a workout, or your arms are. Up side is after removing the nuts, there really isn't any corrosion left on the studs. It's been scraped off by the nut.

    Pics- Tire with tire iron marks- see how far you have to put your iron. Tire iron placement- where the iron starts. Bead locker- what it looks like inside your tire- tools and rims- job done, tools used, mostly.

    Part two starts with the a3 wheels.
    Attached Images Attached Images
    BadMastard

    M35A3C- bobbed (sort of) and 395's cause that's how we roll
    Mep 802a.
    2007 V10 Twin Turbo Diesel.

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    This might seem like a dumb question so please humor me if it is. Are both of those tires set up for MPT rims? I believe the stock 14.50 - 20 are a MPT tire. But I don't think the 395's are.

    Please just check to make sure. There are a few threads about the differences and the potential danger it could cause.

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    dumpsterlandingfromorbit! gimpyrobb's Avatar
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    Yes the A3 rims are MPT, not the 395s are not MPT rated, yes people have run 395s on A3 rims.

    BM(hehe I said BM) I have swapped out a set of 7 395s from fmtv rims to A3 rims in a day. You will feel like death for the next week. Just an FYI!

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    2 Star General flyxpl's Avatar
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    Quote Originally Posted by Sephirothq View Post
    This might seem like a dumb question so please humor me if it is. Are both of those tires set up for MPT rims? I believe the stock 14.50 - 20 are a MPT tire. But I don't think the 395's are.

    Please just check to make sure. There are a few threads about the differences and the potential danger it could cause.
    you are correct . The A3 rim is MPT the 395's are not MPT . SOme guys do it and some guys say no way .

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    Thats a interesting beadlock. I haven't seen a split 1 like that 1 before . would make for easier installation.

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    Gimpy,

    lol... someone finally got it! Bm. he he he. But yes, my arms feel like they went to war. I haven't even moved them to the a3 rims yet. I had to find a bigger breaker bar. Holy crap those rim nuts are tight on the a3!

    Ya, I heard about the 395 debate. It's a fascinating debate. I hear it's impossible, and I hear it's just fine. Looking at the beadlock on those puppies, I don't think grenades could get them to roll off. Maybe a tactical nuke, but just maybe. I will see how they go together on the first one and let everyone know what I find.

    Speaking of which, Hey Gimpy! can you use the o ring from the hemmt tires on the a3's? I'm good I think for now, but spares are a nice idea!

    Like I currently have 8 spare rims. Can you say boat anchor? Anyone in the PNW that needs em? PM me. If you're not out here, no I'm not shipping them. I'm tired of moving them. Very tired.
    BadMastard

    M35A3C- bobbed (sort of) and 395's cause that's how we roll
    Mep 802a.
    2007 V10 Twin Turbo Diesel.

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    dumpsterlandingfromorbit! gimpyrobb's Avatar
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    If I remember correctly, they are different sizes(Orings) but I would set 2 halfs of a rim together with the Oring and see if it will compress. If so, I think it should work. You know the A3 bead locks are wider than the FMTVs right? The A3 rim is 11" wide compared to the 10" FMTV. If you were to sell some of the FMTV bead locks, I may be interested.

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    Bet on a clean Corvette rchalmers3's Avatar
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    According to photo 4 of 4, the bead seating looks excellent. The rust stain appears to be full contact to the lip of the bead. So while the tire may not be designed for MPT rims, the tire lacks a bead saver that allows it to work.

    Rick

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    Gimpy,

    Ya, I know about the beadlocks being a different size. I'm at that point where I'm about to take my first 395 and put it on my a3 rim. I'd actually say removing the beadlock from the a3 tire was easier than removing it from the fmtv tire. Now as for installing it.....

    For everyone, does anyone in the PNW have a local source for hemmtt centers for the deuce? My next possible trick is to take some of the 395's and put them on my 109a3, but I'm either going to use a3 wheels or reuse the fmtv wheels, which I think we can recenter. Correct me if I'm wrong Gimpy. End result- new shoes for the whole family.
    BadMastard

    M35A3C- bobbed (sort of) and 395's cause that's how we roll
    Mep 802a.
    2007 V10 Twin Turbo Diesel.

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    2 Star General Mike929's Avatar
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    I bought 8 of the same type of FMTV wheel/tires from GL and was planning to recenter the FMTV wheels for my deuce.

    Why recenter Hemmtt wheels when you already have a set of wheels that were made for those tires and should be just as easy to recentered?

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