dek1581 Posted April 8, 2013 Share Posted April 8, 2013 anyone know when mack first produced an overdrive transmission? was it a maxitorque and how many speeds was it? Quote Link to comment Share on other sites More sharing options...
Brian Blaylock Posted April 8, 2013 Share Posted April 8, 2013 I don't know if any of these were first or not but the tr720, trd720, trt720, and trq720 were all overdrive transmissions and available in B-Models Quote Link to comment Share on other sites More sharing options...
j hancock Posted April 8, 2013 Share Posted April 8, 2013 Overdrive was available in L model Mack trans. like a TR 150 with a .77 over in a 5 spd. A TRD 150 was a 10 spd. also with a .77 over. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Superdog Posted April 8, 2013 Share Posted April 8, 2013 Overdrive was available in L model Mack trans. like a TR 150 with a .77 over in a 5 spd. A TRD 150 was a 10 spd. also with a .77 over.Oldest I have is a '48 LJ with the TRD150.Those old ones had a weird shift pattern on the main box,.first was clear over to the right and up,2nd was to the far left and up,3rd straight down,4th to the center and back,5th(OD) straight up to the dash.Reverse was straight down from 1st. Quote Link to comment Share on other sites More sharing options...
dek1581 Posted April 10, 2013 Author Share Posted April 10, 2013 ok, i'll try to condense my search to say, like late'60s on. after trl 107 maxitorque was produced, what was the first overdrive version of this transmission? Quote Link to comment Share on other sites More sharing options...
Superdog Posted April 10, 2013 Share Posted April 10, 2013 I don't remember the model number,only ever seen one in person,but it was a 5 speed main box with reverse,and it had a second stick that was only shifted in 5th gear,it was for overdrive.There was another with the same set up only the 2nd stick was for use with 1st and reverse only,it predated the more common version of the 2 stick 6 speeds,I've seen 2 of these in person. Quote Link to comment Share on other sites More sharing options...
terry Posted April 10, 2013 Share Posted April 10, 2013 I don't remember the model number,only ever seen one in person,but it was a 5 speed main box with reverse,and it had a second stick that was only shifted in 5th gear,it was for overdrive.There was another with the same set up only the 2nd stick was for use with 1st and reverse only,it predated the more common version of the 2 stick 6 speeds,I've seen 2 of these in person.Mike would that be a TRDXL1071 Direct and a TRDXL1070 Overdrive? Terry Quote Link to comment Share on other sites More sharing options...
REOGasMackDiesel Posted April 11, 2013 Share Posted April 11, 2013 There was a guy in madison, He claimed to have a Mack 15spd double Over Drive. Said 5th in his main was over drive and 3rd in his auxy was over drive. He drove B61 tandem, It had SWB, huge axles and tires !Claimed his main box had .85:1 5th gear and a .85:1 3rd gear in his spliter. Is that even a possible combo ? ! Than if so wouldn't you need a Maxidyne to make it work out right ? ! Or would a Thermodyne handle the twin Over Drives ? !Mike Quote 1953 REO M48.1962 GMC 3000.1969 AMC AMX-390.1983 AMC Eagle SX/4.1988 AMC Jeep Comanche. Link to comment Share on other sites More sharing options...
fasttruck Posted April 12, 2013 Share Posted April 12, 2013 Startability and top speed would be a function of rear axle ratrio and tire size. I have a B81SX with 8.27 rears, 24:00 tires and a Q box with two gears above directand it motors right along with a 180 hp motor. Had a R model once with a 13 speed triplex and 4:26 rears on 20:00 rubber and it would go 100 miles a hour if you could launch it. Quote Link to comment Share on other sites More sharing options...
fifth wheel Posted April 12, 2013 Share Posted April 12, 2013 Isn't the 5 speed Maxitorque the fastest overdrive, something like .67/.68FW Quote Link to comment Share on other sites More sharing options...
Superdog Posted April 12, 2013 Share Posted April 12, 2013 the T2050 and T2060 are .60 overdrive,the T2070 might be too. Quote Link to comment Share on other sites More sharing options...
kscarbel Posted April 12, 2013 Share Posted April 12, 2013 A rare Mack overdrive Maxitorque transmission is the 7-speed TRDLG1070. Quote Link to comment Share on other sites More sharing options...
j hancock Posted April 12, 2013 Share Posted April 12, 2013 The T2070 and T2080 are also .60 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
REOGasMackDiesel Posted April 12, 2013 Share Posted April 12, 2013 Well .85:1 is a 15% OD so dual OD's would of gave him 30% or .70:1 in 15th gear. The fact he said it ran 65mph at 2000rpm and the large tires looked to be about 12.00-24 so he'd of had to be running a 6.3 to 6.4 axle ratio to net 65mph@2000rpm with .70 OD.But I'm just guessing, Also claimed it was 711 diesel but I heard a turbo when he headed on down the road.Mike Quote 1953 REO M48.1962 GMC 3000.1969 AMC AMX-390.1983 AMC Eagle SX/4.1988 AMC Jeep Comanche. Link to comment Share on other sites More sharing options...
JStevens120 Posted April 12, 2013 Share Posted April 12, 2013 My B has the TRTL720. .69 with both boxes in over. cruises right along at 70MPH on the way to the track with a 673C under the hood 4.63 rear gear and 11R22.5 rubber. Quote Link to comment Share on other sites More sharing options...
REOGasMackDiesel Posted April 12, 2013 Share Posted April 12, 2013 I only seen the truck in passing after that maybe 5 or 6 times.So I can't really say as what it all was for sure. Tombstone radiator not the big wide job.My guess was about a 1950s model anyway, Without finding the truck again its not likely we will ever find out just what it was.Mike Quote 1953 REO M48.1962 GMC 3000.1969 AMC AMX-390.1983 AMC Eagle SX/4.1988 AMC Jeep Comanche. Link to comment Share on other sites More sharing options...
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