![]() You may be lucky and have the right diagram on the shifter knob.A 13 speed ends up 13 I think.Its R 2/6-7 4/10-11 1 3/8-9 5/12-13 which is the most likely, or its R 2/6/10 4/8/12 1 3/7/11 5/9/13,thats that low range 13 speed,THAT may not be right,never drove one except around parking lot. On those old gas burners,the main box is synchronized,so you use the clutch.You dont need to use a clutch on a diesel with nonsynchronized transmission.You go by RPMs,shift without clutch.I can make it sound like a automatic up or down,9,10,super 10,or 13,only use clutch to start/stop.Most trucks have those transmissions9,10,13 speed.In the 90s they had a super 10,you shift 1,then move button for second,pull to nuetral move button pull into 3rd,wind out,move button,wind out,push into 4th with button on low side,wind out,shift button to high,wind out shift to 5th(this is 9th gear)wind out,move button to high side thats 10th. There are transmissions that I dont know about,but when you say "13 speed" most likely its a 9 speed with a splitter box.Could have came out of the factory that way,or could have been added onto a 9 speed.They last a long time if you dont abuse them.They get kinda noisy in a old truck when they get some wear on them,mostly on the high side.You can tear one up in a couple of days if you dont know what you are doing,and you dont "preselect"any gears in a 13 speed,or any big truck transmissions that I can think of. There were 2 stick 4x4s,there are lots of different 2 stick transmissions,some in old gas burning dump trucks.I drove 1 this fall that was a 5and 3 speed auxilary,no 2 speed axle,in a 76 Chevy C70 I think it was. Its hard to say what one of those old Eatons would cost to fix,maybe as much as a thousand more.They were kind of rare,and could very well be in a dump truck,mixer,OTR tractor.They were around in the 70s up untill now I guess. If you are lucky,what breaks will be in the back box,and you can buy a back box off of a 9 speed if you are lucky,then maybe find a driveshaft that will work,and keep running,if its the right transmission. Thirteen speed transmissions are nice untill they break,Then you sometimes can buy a good 9 speed transmission,for less than it takes to fix a 13 speed.They could cost 2 or 3 thousand dollars to fix,or exchange.You can rebuild a Cummins motor for around that if you do it yourself. After I thought about this,there are even more transmissions.Its kind of hard to say how you shift it,if its grinding gears,you dont know what you are doing,and its not fun to drive if you have to stop on the shoulder and shift every time.Either you split the gears or not,you have to know because you shift those transmissions differently,and you wont be able to drive a 13 speed like you do a 15/16 speed without tearing something up,or if you are driving in the mountains,could be bad. ![]() ![]() There was a old 4x4 transmission that you shift 1,2,3,4move button on shifter to 2nd position,1,2,3,4 again,move button to third position1,2,3,4,move button to 4th position1,2,3,4.Thats usually hooked to a 318 2 STROKE Detroit engine back in late 60s early 70s.Since none of these transmissions have synchronizers,if you are going down a big hill,you need to be in the right gear,cause if you pop it out of gear,you are freewheeling,and if you cant get it slowed down with your brakes,and back in gear,it could get real bad in a hurry.Believe me,you wont do that but 1 time.It could be the last time you do anything. None of the big diesels(and Ive worked on them back to the sixtys)had synchronized transmissions.Some had Allison Automatics,maybe stuff like garbage trucks and buses,but big rigs have air shift transmissions,non synchronized 2 counter shaft transmissions that I ever saw.The only synchronizer in the 9,10,speed is high/low range.There is 2 in a 13 speed,high/low main box,high/low back box. That is not a 13 speed really,its a 15 or 16 speed,most likely a old Eaton heavy duty transmission. Look around in the truck and see if there is a diagram,that most likely will tell you if its a low or high range transmission.If its a low range(its been a long time ago,and not real sure about if this is right)with your shift button in the low position you pull the other button up,then shift 5 gears(most times you can start out in 3rd on this low side)shift 3rd,4th,5th,push the button down I think,go to 1st,2nd,third,4th,5th,neutral,shift button on knob to high side,go to 2nd,3rd,4th,5th.No splitter. Re: OT HOW TO SHIFT A FULLER TRANNY? in reply to lenray, 12-22-2007 16:32:10Īfter thinking about this and reading what you said to start with(I hope you read this)there is another 13 speed which is a low range.
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