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I'm no where near the expert 41Chevy is, but people do discuss changing the drive sprockets for a higher top speed (the drive sprockets are easy to get at and sprockets on the wheels are about 24 inches, so no much you can do there). There is a story of a guy who changed sprockets plus some other mods to get highway speeds from a chain drive (a hair raising thought!).. Link below, nice looking truck either way.

http://forums.aths.org/43526/Chain-Drive-Macks

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If the brakes are working too hard you can just flick the switch on the dash to enable the jake...Works great every time. :whistling: I'm guessing you paid a good deal of attention to load, road conditions and hills even more so than now...If you didn't you probably didn't live too long even at reduced speeds...Yikes.

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I'm no where near the expert 41Chevy is, but people do discuss changing the drive sprockets for a higher top speed (the drive sprockets are easy to get at and sprockets on the wheels are about 24 inches, so no much you can do there). There is a story of a guy who changed sprockets plus some other mods to get highway speeds from a chain drive (a hair raising thought!).. Link below, nice looking truck either way.

http://forums.aths.org/43526/Chain-Drive-Macks

I borrowed this pic,but it was taken at Walcott the year Art Robinson brought his AC,he was a super nice guy,and really took a liking to Mikey. Art couldn't see very well so didn't get to drive his trucks.didn't stop him from enjoying them,though. I was standing out next to the show entrance talking to some people,and next thing I knew,this AC came flying by,Mikey driving and Art riding.

post-61-0-86889600-1420005872_thumb.jpg

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picture a trip down loveland with those brakes and about 12 tons on the back :whistling:

Okay--is there a problem with this? Why do ya think they're so LOW geared? (Besides a little less power than is adequate...)

"Remember-ANY Gun Control is Unconstitutional!"
<!--sizeo:3--><span style="font-size:12pt;line-height:100%"><!--/sizeo--><i><b>MACK-E Model Registry # 36</b></i><!--sizec--></span><!--/sizec-->

<a href="http://www.nvabatetravel.com/"target="_blank">http://www.nvabatetravel.com/</a>

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Change final drive ratio by going up or down on primary drive sprocket. I have a few different ones. The standard is 14 tooth, I have OEM 12 and a 13 tooth primaries that were a $8.10 factory optional pack. Rears are 39 and 43 teeth. I have an after market set from 1937 that are 21 primary and 47 final. With the 40 x 6 rear wheels and tires it would give you a top speed of about 50 + at 1600 RPM.

Loads? This was at the high end of normal Early 7 1/2 tonner with NO front brakes by probably have Bendix Vacuum Assist. Truck weight + trailer weight + 95550 Marion, all pulled with 70 or 74 h.p. in the BRONX

attachicon.gifac plus.JPG

Reminds me of re-gearing my old Harley. (the '80-80) Changed the transmission output sprocket on it from a 22T to a 24T and the wheel sprocket from a 51T to a 46T. After that,it'd roll down the road at 75 turning a leisurely 2300 revs.( I COULD have gone further with it by changing the motor sprocket from a 22T to a 25T,but that would've been overkill.) That kicked my mileage past the 50 mpg mark by a ways too.

"Remember-ANY Gun Control is Unconstitutional!"
<!--sizeo:3--><span style="font-size:12pt;line-height:100%"><!--/sizeo--><i><b>MACK-E Model Registry # 36</b></i><!--sizec--></span><!--/sizec-->

<a href="http://www.nvabatetravel.com/"target="_blank">http://www.nvabatetravel.com/</a>

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Got to remember one thing with all the teens and twenties trucks and the brakes, gearing and power. In their day we had may 20% paved highways with macadam or concrete. Most were still wagon trails or less. City roads were cobble stone or packed dirt and clay either oiled or watered. A lot of places these trucks went our modern units would have a ton of trouble with. As for the loads, those people never knew it couldn't be done most times they were the first motorized vehicles to move the loads and go where they did. Early drivers were real teamsters who went with the trucks the same places they went with the horses or mules.

AC MACK could be gotten with an optional 7 and 2 gearbox. I don't know anybody who ever saw one except in the spec sheets.

My grand mother would drive into the corn field with her Packard and most times get stuck. Could never understand why when she had a horse and buggy before the Packard, she wouldn't get stuck. Paul

"OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK"  Thomas Edison

 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’

P.T.CHESHIRE

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The history lessons, and pictures, are appreciated as always. Interesting to see what people were able to accomplish when there was nobody there to tell them "It can't be done." The picture of the 7.5 tonner is amazing. Wish I'd been there! ;)

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