Allison 5sp: trans stuck in third but has reverse

[Righteyeblind]

If its 4x4 the output speed sensor is on the top of the transfer case. Pull it out and stick your pinky in the hole to see if that wheel is loose. Could be broke if it was shocked hard. Input is the front most sensor on top of the trans. Did you check your fluid level also? I guess you would have a different code if that were the case.

 

[07dirty]

Thanks for clarifying that the sensor is on the top. :thumb:

 

[Mike L.]

You have 3 sensors. One on the bell housing driver side ( engine rpm sensor ), one on top of the case, ( turbine speed sensor ) and one on top of the transfer case ( output sensor ). Switch the input and turbine sensors as they are identical and see if the code changes. TCM uses the turbine and output sensors to command shift.

 

[corey423]

ok ill give it a shot i orderd a speed sensor. i just pulled the pan im guna pull the valve body and clean it up. Ill check out that wheel on the t case. Fluid is fairly clean the magnet on the pan has mabey a 16th inch of material on it. Im going to get a inner filter and check the speed sensors and switch em around to see if i get a diff code and ill let ya know what i come up with. Im really hope its just a 70 dollar sensor that will be awesome

 

[07dirty]

Mike l. Is the man

 

[corey423]

ok i checked the solenoids with a multimeter one is incomplete its the one farthest on the drivers side. its the last one closest to the drivers side in the line of three i cant find what its called to get a new one theres part numbers and a number 2 on it but its all steel bodied i fountd the plastic ones but im lost on this one i have no idea on it. im going to post a pic of this solenoid in my garage cause i cant post it in this thred for some reason any help or sugestions would be appreciated

 

[Mike L.]

First of all, how can you check the solenoids without knowing the values? Furthest one on the driver side is the F trim solenoid which is also the TCC solenoid.

 

[corey423]

all i did was check continuity and i all of them but the f trim was complete the f was not im going to order thet and a speed sensor hopfully thats it.. the trans is clean and the fluid dosent smell burnt so its gota be a sensor, im sorry ive been a pain but im lost on automatics

 

[07dirty]

Does your multimeteter say OL?

 

[07dirty]

did u ever fix this?