6x6 Mack Granite build - update

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6x6 Mack Granite build - update

Postby roadranger on Sun Aug 30, 2009 11:35 am

I'm building a 6x6 tractor to haul an equipment lowloader and dump trailer for my construction company. Chassis is a used King Hauler I bought awhile ago.

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Installed a F350 tranny/transfer case, which has the motor directly over the tranny instead of in front of the tranny like on semi trucks. This puts the motor right under the Mack cowl, which makes for a tight fit. Also installed a 55 T motor.

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I built up the rear springs to a 6 leaf using some of the F350 front axle leafs. This brought the axle spacing slightly closer together, so I had to rework the short dogbone to fit.
Also mounted Fulda lug type offroad tires, so the tractor can get the heavy equipment on site.

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The front axle is from a F350 with relocated mounting stock King springs. Also used a F350 front driveshaft. The servos were relocated in order to clear the powered front axle.

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Last edited by roadranger on Sun Sep 27, 2009 4:51 pm, edited 3 times in total.
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6x6 Mack Granite build - cab

Postby roadranger on Sun Aug 30, 2009 11:39 am

Here's how the Bruder Mack cab had to be chopped up to fit on chassis. All of the interior parts had to be removed in order to fit over the motor and tranny.

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Here are 2 shots of the cab mounted on the chassis. It looks kind of tall on the chassis, but most 6x6 tractors are tall. Besides, the motor on top of the tranny comes right up to the bottom of the windshield - can't cut THAT out!

Now I have to figure out where/how to mount the ESC, receiver, and 7.2 battery. It's pretty cramped in this small cab! Good thing the doors open on this cab, that way I can get to the battery plug to recharge it.

I'm going to mount the stock Bruder air tanks on each side under the cab, as that is a Mack signature.

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Jim Bruneau
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Re: 6x6 Mack Granite build

Postby semibigrigger on Sun Aug 30, 2009 8:21 pm

Looks great so far.
I keep saying that I'm going to do a 6x6 but the tranny takes up so much room.
Ken M.
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Re: 6x6 Mack Granite build

Postby roadranger on Mon Aug 31, 2009 8:39 pm

The high flotation wheels/tires came in from Rod in Australia.
Boy, these things stick WAY out from under the fender! May have to fab up some fender flares...

They do look tough, tho! :woohoo

with the regular wheels;

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with the high floats;

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with the regular wheels;

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with the high floats;

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Jim Bruneau
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Re: 6x6 Mack Granite build

Postby roadranger on Wed Sep 02, 2009 9:34 pm

I guess one way to get the wheels tucked in under the fenders is to use a hexed inner dually wheel.
But I don't think the inners are chromed, so ALL the wheels would have to be painted - white I guess.

Have to think about that, some...
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Re: 6x6 Mack Granite build

Postby hauler_10-4 on Thu Sep 03, 2009 1:27 pm

Looks cool with the float tires. Is a TLT axle narrower then the f350 axle?
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Re: 6x6 Mack Granite build

Postby Pete359 on Thu Sep 03, 2009 1:58 pm

hauler_10-4 wrote:Looks cool with the float tires. Is a TLT axle narrower then the f350 axle?

Yes it is, about 5-6mm.
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Re: 6x6 Mack Granite build

Postby roadranger on Thu Sep 03, 2009 8:33 pm

I looked around for a TLT-1 axle, and they are going for $79 + shipping. :no

Too much for a measly 3/8 inch gain in narrowing the wheel spacing.

I really like the float tires, so what could I use for fender flares?
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Re: 6x6 Mack Granite build - update

Postby roadranger on Sun Sep 27, 2009 4:50 pm

Update - here's a few shots of all the electronics installed;

side view with the ESC under the hood, and 1 set of batteries inside the cab door. There's another battery set on the other side for a total of 3200 mAh.

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Under the hood, the ESC, on/off switch, and battery Y connector.

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Thru the windshield, 55 turn motor, batteries left and right, and Spectrum 6 receiver.

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Working on it slooowly!
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Re: 6x6 Mack Granite build - update

Postby espeefan on Tue Sep 29, 2009 10:47 pm

Looks great so far. I know you don't feel like spending the money for a TLT-1 axle, but it would definitely be the best route to get those wide super singles tucked under the fenders. Maybe try posting a wanted ad in the for sale section. A lot of these guys are also into rock crawlers, and you may be able to score a TLT-1 axle for less. Or try scale4x4.com and rccrawler.com.
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Re: 6x6 Mack Granite build - update

Postby bigdodge88 on Wed Sep 30, 2009 1:18 pm

This one should be nice. I really like the offroad tires. I can try and look around for a cheaper set of TLT axles for you if you would like me to.
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Re: 6x6 Mack Granite build - update

Postby roadranger on Sat Oct 03, 2009 7:39 pm

bigdodge88 - Thanks for the offer, but I've already got this axle set up in the chassis. Willy from Custom RC is going to make me a set of wheels with a big setback to get the tires mostly under the fenders.
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