13 speed not shifting right - TheDieselGarage.com
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post #1 of 27 (permalink) Old 03-05-2011, 04:22 AM Thread Starter
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13 speed not shifting right

I have a 13 speed eaton and the high low on the high side of trans is not working correctly. When its in gear and you shift the red switch to the high side it will work fine, if you shift it back to low it will work fine. If you try to pull it out of gear to upshift and switch the red switch to the low side it will not shift and it just sounds like its trying to shift but its not and it wont go into any gear and you have to stop and start again. What would cause this? I just got the truck and it does this no knowledge if it used to work or what. It shifts great otherwise throught the 9 gears. Any help is appreciated.
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post #2 of 27 (permalink) Old 03-05-2011, 04:41 AM
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First check to see if your trans has an air filter before the regulator, if so clean it, if not check the air pressure after the regulator, the link to the specs can be found in the handy links sticky at the top of the forum, roadranger literature center, if that is ok the shift fork on the splitter is prolly worn and not putting enough pressure on the syncro (aux section rebuild)

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post #3 of 27 (permalink) Old 03-05-2011, 11:48 AM
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Quote:
Originally Posted by cdwood388 View Post
I have a 13 speed eaton and the high low on the high side of trans is not working correctly. When its in gear and you shift the red switch to the high side it will work fine, if you shift it back to low it will work fine. If you try to pull it out of gear to upshift and switch the red switch to the low side it will not shift and it just sounds like its trying to shift but its not and it wont go into any gear and you have to stop and start again. What would cause this? I just got the truck and it does this no knowledge if it used to work or what. It shifts great otherwise throught the 9 gears. Any help is appreciated.
This is a shot in the dark, but I think you are trying to drive a RTO like a RTLO. You cannot pre-select a splitter shift on a RTO. When you try this, it will get caught in the middle, and like you say, you have to almost stop to get it in gear.

RTLO's are made to change the splitter while you are in neutral with no problems.
I may be way off on this....not sure.

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post #4 of 27 (permalink) Old 03-05-2011, 12:02 PM
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Sledman, You could've just said.. Hey now, Quit tryin to split them gears in neutral..
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post #5 of 27 (permalink) Old 03-05-2011, 01:23 PM
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i am with sledman you have to pre select.

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post #6 of 27 (permalink) Old 03-05-2011, 01:51 PM
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I have always preselected in every 13speed Ive ever driven.

Not to hijack the thread but I have a 14609B that I had a splitter added to. The trans was a rebuild from a respected shop in the area and the splitter was brand new. Ive spent the last 5 years trying to learn how to shift it. All the pressures are correct.

What I found "worked" was to shift to OD then move the lever up to the next gear and downshift to direct. Downshifting worked like it was supposed to. Recently Ive been upshifting by moving the splitter to OD just after the lever has gotten to neutral and hitting the jake to dump the RPMs. It scuffs every gear. If I dont use the jake it wont shift until the engine falls to idle. The splitter works fine if Im not moving the lever.

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post #7 of 27 (permalink) Old 03-05-2011, 02:06 PM
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Quote:
Originally Posted by Flyingpig View Post

What I found "worked" was to shift to OD then move the lever up to the next gear and downshift to direct.
Thats how a RTO 13 speed is suppose to be shifted.
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post #8 of 27 (permalink) Old 03-05-2011, 02:21 PM
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I cant agree there. Let me be clear. Lets say Im in 7th direct and shift to OD. To shift up I had to move the lever to 8th OD then shift back down to direct, then as speed increased up shift to OD. That doesnt make any sense at all thats the prescribed way to upshift.

And like I said, for the last 30 years Ive been preselecting all 13 speeds till I got this one built. Granted, mine is a bit a a hybrid. My lowly 9 spd now has 3 overdrives.

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post #9 of 27 (permalink) Old 03-05-2011, 03:21 PM
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Are you using 1/8" air line on the tranny or 5/32"? I noticed a huge difference after swapping to the larger 5/32” air line. The “dropping out of gear” when trying to split while shifting the lever has almost completely stopped.

Have you also checked the splitter solenoid/plunger on the tranny? If the truck sat for a length of time, or the air system has had a lot of moisture in it, there may be rust buildup in the plunger assembly. A good cleaning will help a lot.
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post #10 of 27 (permalink) Old 03-05-2011, 04:05 PM
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Preselecting puts pressure on the fork and syncro before crossing neutral, which is good if you only flip the button just berfore making the shift, if you leave it for long you wear the fork out, the fork is not hardened to prevent damage to the collar. And if every thing is set up right the syncro will pull it in . Bigger air lines is a good plan. you also need to make sure that the spliter is getting full air pressure in hi range, and is always "live" , it should have full regulator pressure in any gear position while in HI range.

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