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How fast does a M1008 go?

bigjmcconnell

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South Toms River, NJ
Nice clean truck. I was surprised to see the higher speeds posted. Everything I have heard/read says 55 mph. Good to know. Appreciate the info. I have a long way to go before mine drives, so its good to know what to expect.
 

idM1028

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Somewhere in Nebraska
The Gear Vendors is pricey, but you should be able to put it on the truck yourself. About the biggest modification you'll have to do is get a shorter driveshaft.
P.S. ???? Don't know how the thread got on 1911's. . . Unless you have a concealed carry permit, I wouldn't try hiding it in the truck.
 
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dstang97

Well-known member
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Clover, SC
I'm sorry but I'm a non believer. As far as I'm concerned any stock CUCV besides the m1009 could not reach that speed unless it was on a trailer, being pulled by something else.
 

M1008driver

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Great Falls, Montana
I am a unbeliever too. I could video it, but I don't think I will push it that fast again. I will say when I first got the truck I drove 75 mph on the way home not realizing the truck didn't go that fast.

The seller already said he had it up to 68. My speedo goes to 85 and that is where I took it, easily, and verified by my GPS. I still don't believe it myself and I was driving.

I am asking and trying to find out why. There is a shiny bolt on the rear end and I am wondering if the guard changed the 4.56 for something else.

EDIT- I do CCW and the 1911 is on my side. I would never leave a pistol in the truck to be stolen.
 

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idM1028

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I'd say just keep the pistol on you. Easier to reach if you need it and there's not a lot of places to hide it in the truck anyways.
Thats your fill plug. Wouldn't suprise me if somebody rounded out the square hole on the old one and decided to replace it once they got it off. If they were swapping out gears they would have to pull off the diff cover on the back off to get to them.
 
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M1008driver

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It has to be the rear if the trans is stock. The fill plug bolt is a clue and may have been changed when/if they did the swap. Since the truck was the National Guard does the M1009 and M1008 parts interchange? I fear that may be the source.

I have the maintenance record and will go look.

EDIT- I looked and all it had was the periodic maintenance done. The truck is a M1008A1 and cost $31,289 new.
 
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91W350

Well-known member
4,414
57
48
Location
Salina, Kansas
I guess I am an old guy and do not get it. When I drove my first M1008 it sounded like it was buzzing at 50 mph. I could run it around 45 to 48 and get close to 20 mpg running down the road. It was a sad day for me when I got plowed by a Suburban.

When I finally picked up my new to me 2nd M1008, that old buzzing at 50 was back. When you are accelerating moderately, does yours shift firmly at about 15 and 25 mph? High gear under acceleration at 25 mph and we expect that gear to take us to 75? Have you tried mashing the throttle for a down shift to passing or second gear? You should find that rare to impossible over about 35 mph. Listen to it accelerate, that engine is humming at 50.

The trucks are just geared low, the engine was designed to turn slow. Unlike a screaming two stroke Detroit or a Cummins 4bt or 6bt, you cannot get away with running these against the governor for hours on end. The guys that tried call them junk because the main bearings will not stay in them. The main bearings do not stay in because the block was not up to the strain. They crack through the main bearing webbing. My buddy in the machine shop says all 6.2s have a broken block, broken crank or both. He of course does not see the ones that lived in lower rpm 1/2 ton applications.

You got a nice one, it is none of my business what the dollars are, it really does not matter what it cost. You take care of that truck and engine and it will run you for a long, long, time. You will probably get tired of it first. Pushing it beyond its design though is just asking for trouble. It is one of those vehicles you have to learn to respect for what it is. Too many guys try to make it a F250 or F350 Powerstroke or a Ram 2500 or 3500 Cummins. It is a workhorse of a different flavor. It will and can do a lot of work, just at a different pace. Glen
 
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idM1028

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Somewhere in Nebraska
No. The M1009 uses the GM 10 bolt axle on both ends. The M1008 uses the GM 14 bolt axle in the rear. It might have been swapped out by somebody. Go count the bolts on the differential cover on the back. If its secured with 10 bolts, its a 10 bolt. If its secured with 14, its the original 14 bolt. I still can't figure out how the came up with the name for these things. . .rofl
 

M1008driver

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Great Falls, Montana
It's a 14 bolt and I give up. It is nice to know I can get out of my own way, but I will drive 55-60 mph.

I crawled under the truck and saw the trans, transfer case, front and rear drive shafts, and rear differential. Between the trans and tc there are some wires coming out but it is too dark to take any pictures.

I do not see anything not stock under there.
 

idM1028

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Location
Somewhere in Nebraska
The wires are probably for the tranny. I noticed these on mine. It could have been regeared. Next time you change your front diff oil pull the cover off and look for you ring gear (the big gear that sticks out past the diff housing) and the pinion gear (the smaller gear at a 90 degree angle to the ring gear) count the # of teeth on each. Chalk is good for marking which tooth you started on. Divide the number of teeth on the ring gear by the number of teeth on the pinion gear to get your gear ratio. You could do this on the rear, but it would probably be more difficult due to the stuff for the locker being in the way. If the number you get is 4.56, chances are it hasn't been regeared. Also have you driven it in 4H yet and if so, how does it drive? How fast have you gone in 4H? Does it make any strange noises when you do?
 

91W350

Well-known member
4,414
57
48
Location
Salina, Kansas
Mine was made in 1986 towards the end of the contract, late year trucks were titled as 1987s. There are a few in our membership.
 

M1008driver

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Location
Great Falls, Montana
When I picked it up it was a bad snow day. I kept the hubs locked and jumped in and out of 4WD. I would slow down to about 50, pull the handle to 4H and drive at 70-75 mph on the interstate. The truck never made a complaint and I did not know I couldn't or the truck would not do this.

The only thing I noticed was I used most of a tank of fuel for about a 250 mile trip.
 

idM1028

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Location
Somewhere in Nebraska
@91W350 Really? Didn't know that. Guess you learn something new everyday. . .
Well, the gear ratios are the same, otherwise they'd be fighting each other and you would know it.
HOWEVER, it still doesn't mean the truck HASN'T been regeared. Have a look at the front diff next time you change your oil in it and figure it out. Like I said, 4.56 should be stock.
 
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