ThaddeusW Posted October 12, 2010 Share Posted October 12, 2010 Someone on Hanks is asking if this is true and I know I read it here not to long ago. If I recall, all you need to do is switch the shift knob to an 18 speed shift knob. But I also remember someone saying you can modify a 13 speed knob to get all 18 speeds. If anyone has a Hanks account head over to the nuts and bolts forum and post directly, I will pass any info along as well. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/ Share on other sites More sharing options...
fjh Posted October 12, 2010 Share Posted October 12, 2010 Yup its true !you can also modify the 13 knob to make 18! by breaking off the lock out tab! Quote Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65229 Share on other sites More sharing options...
theakerstwo Posted October 13, 2010 Share Posted October 13, 2010 Yup its true !you can also modify the 13 knob to make 18! by breaking off the lock out tab!You are talking mack not eaton.Well maybe some eaton but not all and none that i have done. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65241 Share on other sites More sharing options...
ThaddeusW Posted October 14, 2010 Author Share Posted October 14, 2010 You are talking mack not eaton.Well maybe some eaton but not all and none that i have done.Interesting. So do you mean it might be possible, or might not be possible? Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65293 Share on other sites More sharing options...
fjh Posted October 14, 2010 Share Posted October 14, 2010 Interesting. So do you mean it might be possible, or might not be possible? Doable on a Mack 13 . Quote Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65294 Share on other sites More sharing options...
cgallamore Posted October 14, 2010 Share Posted October 14, 2010 Doable on a Mack 13 .do you have to remove the knob???????????????post pics??????????????????? Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65297 Share on other sites More sharing options...
fjh Posted October 14, 2010 Share Posted October 14, 2010 do you have to remove the knob???????????????post pics???????????????????Chuck no pics man sorry! If yours is mack 13 you can chance taking the knob apart theres a lock out in there that interlocks the two switches ya just got to cut or break it off I beleive its Plastic! Quote Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65301 Share on other sites More sharing options...
RFC Posted October 16, 2010 Share Posted October 16, 2010 You can do that with the knob. When I worked for H an H years ago a guy ordered an RD with a 13 in it and changed his mind as they were prepping the truck. The mechanic was showing me on the old knob (they were putting the right knob on) but I also thought the right way was to change something on the trans as well. Anybody with Mack know about that? Cheers, Rob Quote Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65451 Share on other sites More sharing options...
rhasler Posted October 16, 2010 Share Posted October 16, 2010 You can do that with the knob. When I worked for H an H years ago a guy ordered an RD with a 13 in it and changed his mind as they were prepping the truck. The mechanic was showing me on the old knob (they were putting the right knob on) but I also thought the right way was to change something on the trans as well. Anybody with Mack know about that? Cheers, RobMechanically the transmissions are the same, only the knob is different as FJH said before. On newer trucks, like Bigens, the VECU needs to be reprogrammed with a new datafile so the module recognizes the gear split in low range. If the module isn't reprogrammed a 4-1 fault occurs and limits power/speed when splitting the low range gears. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65456 Share on other sites More sharing options...
Speed Posted October 22, 2010 Share Posted October 22, 2010 HMMmmmmmm---I don't suppose that trick works on the older Road Ranger 13 speeds,does it? Speed Quote "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> Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65685 Share on other sites More sharing options...
theakerstwo Posted October 23, 2010 Share Posted October 23, 2010 HMMmmmmmm---I don't suppose that trick works on the older Road Ranger 13 speeds,does it? Speed NO Also i did a Mack that way a few years back and i think i had to change a air supply line to constant air supply for thye spilter. Could be wrong. My mack info is to for to go get now. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65712 Share on other sites More sharing options...
Gambi80 Posted October 23, 2010 Share Posted October 23, 2010 Mechanically the transmissions are the same, only the knob is different as FJH said before. On newer trucks, like Bigens, the VECU needs to be reprogrammed with a new datafile so the module recognizes the gear split in low range. If the module isn't reprogrammed a 4-1 fault occurs and limits power/speed when splitting the low range gears.So then I've got to ask...What's the point of a 13sp...??? I bet the answer is 'driver preference'... Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65717 Share on other sites More sharing options...
rhasler Posted October 23, 2010 Share Posted October 23, 2010 So then I've got to ask...What's the point of a 13sp...??? I bet the answer is 'driver preference'...There's that, but I think the extended warranty pricing is cheaper for the 13 speed. Due to less use of the air shift on the 13 speed there is less wear and tear to the internals of the transmission. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-65729 Share on other sites More sharing options...
RowdyRebel Posted November 2, 2010 Share Posted November 2, 2010 There's that, but I think the extended warranty pricing is cheaper for the 13 speed. Due to less use of the air shift on the 13 speed there is less wear and tear to the internals of the transmission.99.9% of the time, I drive my 18 like a 13. When you are loaded and have to get started uphill, it's nice to be able to split the low side, though. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-66221 Share on other sites More sharing options...
Gambi80 Posted November 5, 2010 Share Posted November 5, 2010 99.9% of the time, I drive my 18 like a 13. When you are loaded and have to get started uphill, it's nice to be able to split the low side, though. 'Bout the only time I split the low side is when I'm puttin around a quarry or something and I want to shift up but am too lazy to move the stick. The few times I have split the low side under power, I can see how some serious damage can happen if in the hands of a driver trainee type. Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-66364 Share on other sites More sharing options...
RowdyRebel Posted November 5, 2010 Share Posted November 5, 2010 'Bout the only time I split the low side is when I'm puttin around a quarry or something and I want to shift up but am too lazy to move the stick. The few times I have split the low side under power, I can see how some serious damage can happen if in the hands of a driver trainee type.Yup...gotta be real easy getting back on the throttle when upshifting with a heavy load getting going uphill. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/16113-converting-a-13-speed-to-an-18-speed/#findComment-66367 Share on other sites More sharing options...
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