I think that the older transmission is an RT or an RTO, and the newer transmission will be RTLO or some other prefix.
Part of the difference is that the RT had straight cut gears, and the newer Transmissions have helical cut gears.
I think that is why on the RTO Transmissions you can hear them whine.
I think that is also why you can feel for the gears much better on the older Transmissions.
Difference in 13 speeds?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Mar 11, 2020.
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You did and here’s what I got on my existing shift knob;
P=black
SP=blue
S=red
H/L=green
E=brown(not used & no line)
As you posted my knob has; E, R, F, & S. Which color goes to each? I’m assuming S(red) is supply and H/L(green) is for R(range) on the old style? SP(blue) is F on the old style? Have no idea what “P(black)” is for?
Here’s some pics of the lines on the back of my transmission there’s definitely more than two back there so just to clarify for me.Last edited: Mar 12, 2020
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On the hoses on the back off trans on the range slave you leave them alone on the supply valve on the top/side of trans and swap them on the slave on the box in your pic.
This is my 125-13. Just to illustrate the ones you wanna swap.Its a Different style valve but this should give you the idea of location. -
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This cylinder you dont mess with. Just hook that little line coming from top to the R on the old style knob. It is the splitter.
mile marker 27 Thanks this.
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