raybing Posted August 20, 2013 Share Posted August 20, 2013 Hello all,I have a Rd 600 with a T2080. 5.05 rears.Is there a transmission with a large overdrive and more road gears. I work off road with a tree spade and pod trailer. Thanks Ray Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/ Share on other sites More sharing options...
oilburner Posted August 29, 2013 Share Posted August 29, 2013 I am not sure what overdrive you have but Mack makes a nine speed that had a .60 overdrive. With tall 24.5 rubber and a 505 ratio and 2100 rpm that would be close to 80 mph maybe 78 or so Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202409 Share on other sites More sharing options...
ws721 Posted August 30, 2013 Share Posted August 30, 2013 I have a Mack airshift 6 speed, that has @ 3000 miles on a complete rebuild, that was behind my E9 400. I got the line ticket just to prove to myself that Mack did this. Anyhow, it has a .62 overdrive. I would like to sell it as I'm not a 6 speed fan. Transmission is in excellent condition, comes with air operated PTO. for a married unit. If interested call 603 463 7883. My mack had 5.73 ratio with 22.5 tires and would do 78 at 2000 rpm. Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202718 Share on other sites More sharing options...
David Posted August 30, 2013 Share Posted August 30, 2013 The Mack nine speed is .71 overdrive. The 5, 6, 7, & 8 speeds are .6 overdrive. With 5.05 rears you're stuck with what you have. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202719 Share on other sites More sharing options...
pmolitor Posted August 30, 2013 Share Posted August 30, 2013 what overdrive is the Mack 10 speed? Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202770 Share on other sites More sharing options...
oilburner Posted August 31, 2013 Share Posted August 31, 2013 You may be right David but I am pretty sure the Mack nine speed is a .60 at least I thank they made one like that. A guy I run with had a old dm with a six speed in it and it would do about 62 mph. He swap out the six speed with a Mack nine and it would do 80 mph with the nine speed. And it still had a pretty good low hole for pulling out loaded Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202790 Share on other sites More sharing options...
oilburner Posted August 31, 2013 Share Posted August 31, 2013 Well looks like I stuck my foot in my mouth. Looked at the ratio charts and David you are right. It is a .71. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202793 Share on other sites More sharing options...
terry Posted August 31, 2013 Share Posted August 31, 2013 Hello all,I have a Rd 600 with a T2080. 5.05 rears.Is there a transmission with a large overdrive and more road gears. I work off road with a tree spade and pod trailer. Thanks RayI think that trans has one of the widest overdrives in the mack trannys. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202794 Share on other sites More sharing options...
oilburner Posted August 31, 2013 Share Posted August 31, 2013 My truck has a 5.13 ratio and a 107x six speed and 24.5 tall rubber and it will do 56 mph at 2100. Now if I had a .60 overdrive that would give me 40 percent more speed so I would be at about 20 more mph on top. So if he had let's say a 7 or 8 speed with the big overdrive even if he had a .71 over now he would gain 5 or 6 more mph on the top end Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202797 Share on other sites More sharing options...
oilburner Posted August 31, 2013 Share Posted August 31, 2013 Ok now I have done it again. You all ready have the big overdrive. For some reason I thought you had a 10 speed. Yea your as fast as you can go unless you stuck a brownie box in the middle. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202799 Share on other sites More sharing options...
slpwlker Posted August 31, 2013 Share Posted August 31, 2013 This is going back like 10 or 12 years ago. first driving job and I was heading home cruisingcornbinder 460 cummins 10 speed. I come up on an R model that surprised the hell out of me. he got on ahead of me and I got over thinking hell I'll just roll on by him. Hell. was damn near 83 when I finally got around him. Looked inside and looked to be a 2 stick six. Running every bit of 80. HAd that old bulldog just a gettin it Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202800 Share on other sites More sharing options...
David Posted August 31, 2013 Share Posted August 31, 2013 what overdrive is the Mack 10 speed?T2100 is .78 Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202810 Share on other sites More sharing options...
e9500v8 Posted August 31, 2013 Share Posted August 31, 2013 Mack did make a 6 speed overdrive and I do believe they are in the .60 range. They look like a 12 speed they have 3 boxes not just 2 like a normal six speed. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202824 Share on other sites More sharing options...
pmolitor Posted August 31, 2013 Share Posted August 31, 2013 that would be a long split. I have problems with my 6 speed direct drive. the 5th to 6th shift gets me in trouble in the hills. I have 3.87 gears on 22.5s and top out at 68mph at 2100 rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202922 Share on other sites More sharing options...
maxidyne237 Posted September 1, 2013 Share Posted September 1, 2013 Leave it alone, you have the perfect trans for a truck mounted spade. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-202970 Share on other sites More sharing options...
Double stack Mack Posted September 5, 2013 Share Posted September 5, 2013 s Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-203879 Share on other sites More sharing options...
Double stack Mack Posted September 5, 2013 Share Posted September 5, 2013 Can anyone tell me the difference between a Mack 1076 tranny an a 1078 ? Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-203880 Share on other sites More sharing options...
raybing Posted September 6, 2013 Author Share Posted September 6, 2013 Hey folks, I have been working in Michigan and vacationing in Montana! Yaaa.Anyway the splits between gears are too wide for bigger loads, even here in the flatlands of Minnesota with a pod trailer. So I was asking if a mack 18speed would work for me. I still need the lowholes. But never drive over 65mph. Thanks Ray Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-204179 Share on other sites More sharing options...
arlogger Posted October 2, 2013 Share Posted October 2, 2013 i have a 84 r with the air split 6 speed overdrive ...she'll crawl in the bottom hole and get me a ticket in the top hole . will run 80s easy. only thing is there are some big steps after first 2 gears . so used to 6 id probably end up cross eyed with an 18 speed !!! Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-209574 Share on other sites More sharing options...
Brandt Posted October 4, 2013 Share Posted October 4, 2013 I have a 1070B 12 spd. The info the dealer told me was it has an .78 OD FYI: The taller the OD the less fuel efficient you are. Ideally a direct with 2.90's or 3.08 gears ... would be best. Quote Link to comment https://www.bigmacktrucks.com/topic/32388-transmission-swap-r-model/#findComment-210056 Share on other sites More sharing options...
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