Brandt Posted February 19, 2022 Share Posted February 19, 2022 (edited) After I broke my 1070 12 speed, I decided to replace it with an RTLO 15 speed. The shop is running into many problems with the bell housing/motor mounts. The local Mack dealer is clueless on old stuff and stuff that he can't use the VIN to get parts. I will probably give my mechanic access to my BMT account so that I can get out of the middle and let knowledgeable people figure this out. If anybody has done this before, I (we) are all ears!! 1991 RD 690 EM7 Maxidyne. Mack top loader diffs. This is how it all started: Edited February 20, 2022 by Brandt Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/ Share on other sites More sharing options...
Joey Mack Posted February 19, 2022 Share Posted February 19, 2022 Are you needing the part number for the bell housing to fit the Eaton tranny. I have a VIN from an '87 Superliner, with the 15 spd. Eaton.. bolted to an E-9.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489766 Share on other sites More sharing options...
fjh Posted February 19, 2022 Share Posted February 19, 2022 52 minutes ago, Joey Mack said: Are you needing the part number for the bell housing to fit the Eaton tranny. I have a VIN from an '87 Superliner, with the 15 spd. Eaton.. bolted to an E-9.. jojo That should work ! They will have to build their own mounts is all ! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489780 Share on other sites More sharing options...
Popular Post terry Posted February 19, 2022 Popular Post Share Posted February 19, 2022 Should have found another 12 speed or fixed that one, best trans mack ever built! terry i know this doesn't help with your problem, i just had say it! 5 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489790 Share on other sites More sharing options...
Brandt Posted February 19, 2022 Author Share Posted February 19, 2022 Yup, P/Ns, pictures, advice, VINs. At this point anything will help! Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489791 Share on other sites More sharing options...
R.E.D Posted February 19, 2022 Share Posted February 19, 2022 (edited) When I swapped my t2090 to eaton, I got an aluminum bell housing..over time the steel rivets cast in the aluminum busted off because of torque I believe.being a dump truck and off-road all the time didn't help it none.Long story short ,it broke off the passenger side transmission mount and whole engine leaned to the side..it broke the econovance fitting and engine ran itself mostly out of oil until the low oil pressure shut her down...I guess what I'm trying to say is when converting to eaton , look for the steel bell housing.. Red Edited February 19, 2022 by R.E.D Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489809 Share on other sites More sharing options...
Joey Mack Posted February 19, 2022 Share Posted February 19, 2022 RW-713/ 001554.... E-9 450/500... Eaton 15 spd... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489823 Share on other sites More sharing options...
mechohaulic Posted February 19, 2022 Share Posted February 19, 2022 might be interesting to hear the meaning behind "I broke my 1070 12speed. " misuse , old age , bad shift ????? . 12 speed broke what's stopping the 15 from breaking after all the change-over. just wondering . i know things break; that;s what kept me with a pay check for 50 yrs. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489827 Share on other sites More sharing options...
Popular Post Joey Mack Posted February 19, 2022 Popular Post Share Posted February 19, 2022 I thought the same thing... I cant imagine the force it took to break a Mack tranny.. I would expect the driver had broken ribs from the thrashing that occured... jojo 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489828 Share on other sites More sharing options...
Joey Mack Posted February 19, 2022 Share Posted February 19, 2022 or at the least a broken right hand... ouch!! jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489829 Share on other sites More sharing options...
63BMack Posted February 19, 2022 Share Posted February 19, 2022 If I remember he posted a while back something about he was building air and the air built up and the selector valve was in gear and messed something up in the transmission. Must not had it in neutral Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489830 Share on other sites More sharing options...
Joey Mack Posted February 19, 2022 Share Posted February 19, 2022 I saw that, just wanted to have a laugh... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489831 Share on other sites More sharing options...
mechohaulic Posted February 20, 2022 Share Posted February 20, 2022 12 minutes ago, 63BMack said: If I remember he posted a while back something about he was building air and the air built up and the selector valve was in gear and messed something up in the transmission. Must not had it in neutral must be me and old school way of thinking. when ever someone started a truck with manual trans, always push the clutch down and check shift lever for neutral so clutch pedal could be let go. not condemning any situation ; maybe 15 speed was in stock . never had air problems with the quad. i know it's just difficult to accept these new air transmissions and many other "advancements". but then the all manual trans have short comings (rarely). while 3 possible buyer watched ; myself and another mech were in the process of tow-starting a H67T one cold day . he had the wrecker, i had the H67. -with a twin stick duplex. no air built up and only a hand brake (found out it didn't work) . he stopped quick i let up the clutch-- BAM right into the boom of the wrecker. point is ALWAYS make sure both sticks are in gear, compound was in neutral LOL 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489832 Share on other sites More sharing options...
Joey Mack Posted February 20, 2022 Share Posted February 20, 2022 at the least I reach into the truck and check the shifter to see if its in nuetral, especially on freight shakers, like the one thats in my shop today, because the key is in the bottom left corner and its easy to just stick the key in and crank while standing on the ground.. so i reach in and push the stick to be sure.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489833 Share on other sites More sharing options...
Brandt Posted February 20, 2022 Author Share Posted February 20, 2022 99.89% of the time I leave the stick in N when I shut it off. This time I was parked on a steep grade and decided to leave it in gear. I just reached in to start it because the ground dropped away and would have required a 4' step/climb to get all the way in. I sure wish it would have lurched when I put juice to the starter, but it didn't. 15 minutes later, when I returned, the damage was done. Maybe if I wasn't as deaf as a post I would have heard a grinding noise from where I was working, but w/o hearing aids in and more than likely ear plugs in - not a chance of me hearing anything! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489837 Share on other sites More sharing options...
Joey Mack Posted February 20, 2022 Share Posted February 20, 2022 Damn... I get it.. shit happens.... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489839 Share on other sites More sharing options...
JoeH Posted February 20, 2022 Share Posted February 20, 2022 We've all done stupid stuff. I managed to get our 1979 R686 Maxidyne engine to run backwards, lol... You can stall the engine out in such a way that the crankshaft "bounces" in the opposite direction and the engine will run backwards.... A quick pull on the stop knob, bump the key, and you're back up and running! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489841 Share on other sites More sharing options...
Onyx610 Posted February 20, 2022 Share Posted February 20, 2022 Pry a weird feeling when exhaust is coming out of the air filter. Weren’t Detroit’s notorious for this? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489846 Share on other sites More sharing options...
JoeH Posted February 20, 2022 Share Posted February 20, 2022 Only reason I knew right away it happened was my dad says he did it once upon a time. Otherwise I would have been scratching my head as to why the 2 stick R made it go forward and D made it go backwards! 10 years later and the truck still runs like a Mack. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489905 Share on other sites More sharing options...
66dc75 Posted February 21, 2022 Share Posted February 21, 2022 22 hours ago, JoeH said: We've all done stupid stuff. I managed to get our 1979 R686 Maxidyne engine to run backwards, lol... You can stall the engine out in such a way that the crankshaft "bounces" in the opposite direction and the engine will run backwards.... A quick pull on the stop knob, bump the key, and you're back up and running! Did just that with my 3208 cat twice! Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489913 Share on other sites More sharing options...
fjh Posted February 21, 2022 Share Posted February 21, 2022 On 2/19/2022 at 6:14 PM, Brandt said: 99.89% of the time I leave the stick in N when I shut it off. This time I was parked on a steep grade and decided to leave it in gear. I just reached in to start it because the ground dropped away and would have required a 4' step/climb to get all the way in. I sure wish it would have lurched when I put juice to the starter, but it didn't. 15 minutes later, when I returned, the damage was done. Maybe if I wasn't as deaf as a post I would have heard a grinding noise from where I was working, but w/o hearing aids in and more than likely ear plugs in - not a chance of me hearing anything! That there is a real shitty misshape and could happen to anyone! Its kind like stopping the truck and forgetting to pull the spring brake knob! I always park in neutral habit wise How ever! twelve speed I tri to park it at least in the direction the truck is going to travel the next morning hi or low in case the air shift sticks for some reason ( been burned ) at least it can get to the shop that way! Bummer man! sad for you this here is the best dump trans going! in my mind! that said there should be lots of fuller 18 speeds out there for Mack just throwing that out there you got to stretch the drive shaft anyway! Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-489950 Share on other sites More sharing options...
Brandt Posted February 25, 2022 Author Share Posted February 25, 2022 Crescent Ridge shop in PA, provided my mechanic with a parts list needed. We'll see how it works out soon enough. Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-490260 Share on other sites More sharing options...
Dirtymilkman Posted February 26, 2022 Share Posted February 26, 2022 Does anyone really "want" a 15 speed? I thought they were a horrible tranny. Why not a 18? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-490303 Share on other sites More sharing options...
BOBWhite Posted February 26, 2022 Share Posted February 26, 2022 14 minutes ago, Dirtymilkman said: Does anyone really "want" a 15 speed? I thought they were a horrible tranny. Why not a 18? They're not bad I just don't understand why you'd want to split the low gears if you're ever going to go on the highway with hills. Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-490306 Share on other sites More sharing options...
GOOG Posted February 27, 2022 Share Posted February 27, 2022 On 2/25/2022 at 8:37 AM, Brandt said: Crescent Ridge shop in PA, provided my mechanic with a parts list needed. We'll see how it works out soon enough. I think you mean Cresson Ridge. They are the absolute best there is. I sent a driver with a tri axle CL tractor there to have a Mack 18 converted to a Fuller 18. They had him out the door in 7 hours and even had a little drama getting some mounts. I have had zero issues with that truck and their transmission. If they can't help you, you can't be helped! I've had two Mack 12 speeds. I don't like that trans and no longer have the trucks. Tough to find drivers that you don't have to teach that trans to. Last thing I want in my trucks. Quote Link to comment https://www.bigmacktrucks.com/topic/69256-1070b-12-speed-to-fuller-15-speed/#findComment-490498 Share on other sites More sharing options...
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