Passing Gear
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Posting Guru
Joined: Jun 2004
Posts: 1,808
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From: Cincinnati Ohio
Passing Gear
My passing gear dont seem to work. It is connected on the engine and on the transmission. When I stomp the pedal going down the interstate it dont feel like it kicks in. Anyway to find out the problem or adjustments?
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
Essentially, all the detent does is kick it down to second gear. It is a small cable running from your injection pump arm to the trans. If it came off or broke, it will cause it to not shift down. The other way it could kick down is by the modulator, which is vacuum operated. The vacuum control on the IP may have failed. How are your shifts normally, quick and soft, or somewhat firm?
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
The are preset, so no real adjustment necessary. When you replace them, then it might matter if you get one that is adjustable, most are not. Take the hose loose at the valve, and see if there is any trans fluid in it. If so, the diaphragm has failed. If not, leave it loose and see how it drives, it should shift late and hard. To check the kickdown (forgot it isn't cable..) see if it still has spring bak at the trans. If not, something came loose in there.
Elder User
Joined: Aug 2007
Posts: 728
Likes: 0
all VRV valves are adjustable both factory and replacement
connect a vacuum gauge to the transmission side of the vrv and with the engine running open the throttle from idle to 3/4 throttle and see if the vacuum signal deminishes as the throttle is opened
and there is not governor shifts and modulator shifts
all shifts are caused by the governor the modulator increases or decreases throttle pressure in the transmision which changes control pressure at the governor which causes low rpm shifts or high rpm shifts and the modulator is controlled by vacuum signal from the VRV valve
connect a vacuum gauge to the transmission side of the vrv and with the engine running open the throttle from idle to 3/4 throttle and see if the vacuum signal deminishes as the throttle is opened
and there is not governor shifts and modulator shifts
all shifts are caused by the governor the modulator increases or decreases throttle pressure in the transmision which changes control pressure at the governor which causes low rpm shifts or high rpm shifts and the modulator is controlled by vacuum signal from the VRV valve
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Elder User
Joined: Aug 2007
Posts: 728
Likes: 0
one other thing , the engine is governed to about 3500 rpm depending on your axle ratio and road speed the governor pressure in the transmission will not allow a downshift if the engine rpm is too high in third gear
for instance if the engine is at 3000 rpm in high gear it cannot downshift to second because the engines governed speed is lower than the rpm needed for second gear operation at that road speed
for instance if the engine is at 3000 rpm in high gear it cannot downshift to second because the engines governed speed is lower than the rpm needed for second gear operation at that road speed
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Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
all VRV valves are adjustable both factory and replacement
connect a vacuum gauge to the transmission side of the vrv and with the engine running open the throttle from idle to 3/4 throttle and see if the vacuum signal deminishes as the throttle is opened
and there is not governor shifts and modulator shifts
all shifts are caused by the governor the modulator increases or decreases throttle pressure in the transmision which changes control pressure at the governor which causes low rpm shifts or high rpm shifts and the modulator is controlled by vacuum signal from the VRV valve
connect a vacuum gauge to the transmission side of the vrv and with the engine running open the throttle from idle to 3/4 throttle and see if the vacuum signal deminishes as the throttle is opened
and there is not governor shifts and modulator shifts
all shifts are caused by the governor the modulator increases or decreases throttle pressure in the transmision which changes control pressure at the governor which causes low rpm shifts or high rpm shifts and the modulator is controlled by vacuum signal from the VRV valve
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
Your truck is not going to shift down after about 60 mph, it can't because the engine would have to turn to fast after that if you have a 3.55 back end. Get it runnin about 55, then mash it to the floor and see if it shifts.
