Lucky dogg Posted July 27, 2017 Share Posted July 27, 2017 Hey all, I have a 1983 Mack superliner I bought at an auction. Someone restored this truck with a new cab, and put air ride suspension on the truck. It has a 350 e-6 I believe. It also has 4:17 gears and my Tire size is 11 r 22.5. I am in the oilfield and dump truck business. I would like this truck to cruise 65/75mph like modern trucks do. Currently top speed is 57mph at 2000 rpms. It currently has a twin stick 1071 I think in it. I have a 2080b now from spare parts. The twin stick is also popping out of high gear constantly so the tranny needs fixed regardless. Can anyone help me? Will the swap work? Will this truck be able to drive down the road and pull a load ok? A local guy told me this idea is suicide for this truck and a huge mistake? All I pull is frac Tanks, a semi dump, drill pipe, and move my d6 Cat once in a while. Please let me know any help is greatly appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/ Share on other sites More sharing options...
terry Posted July 27, 2017 Share Posted July 27, 2017 Not a good combo, the 2080 is real wide geared, a 1070 12 spd would be perfect with those rears, I drove a DM dump for years with a 12 spd. and 4.17 rears, would run 65 at 1600 rpm,s terry Quote Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-375851 Share on other sites More sharing options...
Lucky dogg Posted July 27, 2017 Author Share Posted July 27, 2017 I'll keep that in mind for sure thanks for the information. When you say wide geared, are you referring to distance between gears or that you ride them out longer? Quote Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-375852 Share on other sites More sharing options...
j hancock Posted July 27, 2017 Share Posted July 27, 2017 The ratios for the 107 14.43 (low first), 8.59, 4.99, 2.83, 1.66 and 1.00 The 2080b 20.08, 11.68, 6.63, 5.24, 3.05, 1.73, 1.00, .60 So, using the 2080B in seventh (direct 1.00) would be exactly what you have now in the 107 (direct 1.00). But, eighth gear in a 2080B is OD .60 which would give you 100 mph @ 2000 rpm. If you deadhead or are lightly loaded maybe you could pull 8th for 70 mph @ 1400 rpm, for example and make it work for you. The 2080B would probably be a little more usable with rear gears like 4.88 or 5.32. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-375903 Share on other sites More sharing options...
thomastractorsvc Posted August 2, 2017 Share Posted August 2, 2017 What would it be with 4.64? My 92 RW713 with that 15 speed is 60 against the Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376420 Share on other sites More sharing options...
harrybarbon Posted August 2, 2017 Share Posted August 2, 2017 we have E6/350 with 1070 a 10 speed overdrive box, (yours is a direct gearbox hence lower speed), and our rears are same 4.17 it cruises at 70 + mph (118 kph) and pulls real good the 12 1070 overdrive is also very good the 2 extra low gears are useful for your work - this box bolts on same as your gearbox 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376437 Share on other sites More sharing options...
j hancock Posted August 2, 2017 Share Posted August 2, 2017 8 hours ago, thomastractorsvc said: What would it be with 4.64? My 92 RW713 with that 15 speed is 60 against the Which 15 speed do you have and tire size? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376445 Share on other sites More sharing options...
thomastractorsvc Posted August 3, 2017 Share Posted August 3, 2017 14 hours ago, j hancock said: Which 15 speed do you have and tire size? RTX15715 11r 24.5 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376509 Share on other sites More sharing options...
j hancock Posted August 3, 2017 Share Posted August 3, 2017 With .60 OD and 4.64, it will still be pretty quick. 66 mph @ 1400, 85 @ 1800 and 98 @ 2100. A .78 OD and 4.64 would be 65 mph @ 1800 and 75 mph @ 2100. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376522 Share on other sites More sharing options...
Jeremy_Brault Posted August 5, 2017 Share Posted August 5, 2017 The 12 speed is an all around awesome tranny, down fall is extremely expensive to overhaul I have one in an r model with 4.17 gears and tall 24.5 rubber cruises about 75 at 2000 according to gauges Quote Link to comment https://www.bigmacktrucks.com/topic/50569-1983-mack-superliner-transmission-swap/#findComment-376740 Share on other sites More sharing options...
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