trans shifting

[kingsley]

Hey guys I wanted a little advice.....my m1009 shifts around 25 mph and 42 mph is that normal? Can the shift points be changed?

 

[CCATLETT1984]

thats about right, you can change a little with the modulator on the side of the trans. forgot which wasy to adjust it. best way would be to get a trans manual from the local parts store, I'm not sure if the TM's show how to adjust it. would be in the -20 or -30 though. you can find the TM's in the tech manual section under the resources heading near the bottom of the page.

 

[rod]

I can't remember when my M1009 shift the first time but it shifts the second time around 45mph.

 

[CUCVFAN]

The valve to adjust the shift points is on the passenger side of the IP. Rotate the top toward the front of the truck to increase shift points or rearward to lower.

 

[Towman2277]

I just learned something new.......I thought you only could with the modulator! Thanks CUCVFAN!

 

[CCATLETT1984]

learn something new everyday. thanks for the info.

 

[steelsoldiers]

Yeah, the one on the side of the pump seems to a better job controoling the RPM of the shift points while the modulator seems to control the firmness of the shift better. That was my experience anyways. The line from the vacuum pump to the valve on the IP has been known to rub and leak so if your truck starts shifting goofy, check it for pinholes. I blew the TH400 governor apart in mine one time and it wouldn't shift out of first no matter what the RPMs. Scared the stuffing out of me.

 

[kingsley]

Okay here goes my ignorance....what is the "IP"?

 

[mangus580]

Injection Pump

 

[kingsley]

how does the trans shifting work off the IP?

 

[Recovry4x4]

Throttle valve sensor IIRC

 

[Jersey4x4]

I have a good used throttle valve/throttle position sensor listed on eBay if you need one.