m1009 transmission not shifting correctly

[kcbbqguru]

I'm a little confused, My 1009 is not shifting into 2nd until it hits 25mph, then about 45mph into 3rd. Is the throttle vacuum valve bad? I have ajusted it back,then forward and still same symptoms. I checked all the hoses and they are fine. Does it needs replaced, or can I clean it?

 

[irishvin]

Recommend replacing all vacuum hoses and then try if not check the vacuum how much and the vrv

 

[kcbbqguru]

Recommend replacing all vacuum hoses and then try if not check the vacuum how much and the vrv

I put a vacuum gage on it, I'm getting 20lbs but from what i have found, should be more closer to 17-18 lbs

 

[Warthog]

The vacuum pump should be pulling about 20" of vacuum. The valve on the side of the injector pump should bring it down to the 8" range at a certain throttle position. The TM 9-2320-289-20 has a step-by-step procedure to test the valve and set it correctly. I even did a write up for it.

 

[irishvin]

I would check out the vacuum modulator see if its clogged pulling that much vaccum it sits on passenger side of trans

 

[kcbbqguru]

I would check out the vacuum modulator see if its clogged pulling that much vaccum it sits on passenger side of trans

If it's clogged, what should I use to clean it out?

 

[irishvin]

I would just replace it if its clogged $15 part up here

 

[Warthog]

Where where you getting the 18" vacuum reading? You do not want that much at the modulator on the side of the transmission.

 

[86M10086.2L]

My trucks doing the exact same thing. I'm very interested to see what your findings are.

 

[Bethelfire]

2 inch hose off of the modulator valve was my problem...very small crack

 

[epitts]

Shift issue

My M1009 has an issue shifting also It shifts fine on first startup. If I shut the truck off after restart it does not like to shift into 3rd gear. I can manual shift from second in to 3rd and it shifts. After that it will shift fine the rest of the drive. But if I shut it off it does the same thing. Ideas?

History New vac pump, valve, hoses, modulator, fluid clean and topped off

Thanks

 

[Jeepsinker]

Sounds like you have a lip seal going bad. Could be something else, but it's more than likely time for an overhaul. Remember though, with transmissions the longer you drive it once a problem starts, the more it will cost to fix it.