Nearly got stranded
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Grand Champion
Joined: May 2019
Posts: 5,146
Likes: 721
From: S.W. Indiana
As was mentioned, since you have a '97 truck, you can fix the speedometer readout by swapping in the correct speedometer pinion gear in the VSS on the side of the transmission (2WD) or the transfer case (4WD). If you can determine the rear end gear ratio and the tire height, you can use this chart to determine the correct pinion gear needed to get the speedometer to read correctly - https://jeepey.com/media/workspace/f...ter-gear_3.pdf
I had to do this to fix my speedometer readout when I installed taller tires and 4.10 gears.
I had to do this to fix my speedometer readout when I installed taller tires and 4.10 gears.
I have a '96. The sending unit is clocked to adjust speed. My plenum may have blown under load. I opened the plates and it's oily in there. No puddles and the oil could be dirt from fuel and running rich, However, I checked the oil level and it's down over two quarts. 2+ quarts in a little over 200 miles is new. It usually uses 1 per 800 miles.
I was going to replace the timing set this spring so I suppose I'll do the plenum along with it. Oh well, I wanted to do a good flush and service on the cooling system anyway.
Champion
Joined: Sep 2012
Posts: 4,867
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From: Central VA
To my knowledge, clocking the VSS will not adjust the speedometer at all. Clocking the VSS adjusts for the size of the pinion gear touching the output shaft gear in the transmission or transfer case - if your speedometer is reading incorrectly and you haven't changed tire size or gear ratio, you may have a bad VSS or worn speedometer pinion gear from being clocked too tightly.
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Grand Champion
Joined: May 2019
Posts: 5,146
Likes: 721
From: S.W. Indiana
To my knowledge, clocking the VSS will not adjust the speedometer at all. Clocking the VSS adjusts for the size of the pinion gear touching the output shaft gear in the transmission or transfer case - if your speedometer is reading incorrectly and you haven't changed tire size or gear ratio, you may have a bad VSS or worn speedometer pinion gear from being clocked too tightly.
According to the dealer and a transmission shop I've dealt with for over 40 years, you adjust the connector.
I'm not going to worry about it. I'm making a list of what I need to repair the plenum, do a timing chain and also a tune up and coolant flush at the same time. Geez it's getting to be a long lisy!
Grand Champion
Joined: Feb 2015
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Moving the housing is to adjust the gear mesh not the speed. You need the correct gear to match the axle gear ratio.
https://www.moparpartsgiant.com/part...n_housing.html
https://www.moparpartsgiant.com/part...n_housing.html
Administrator
Joined: Apr 2010
Posts: 87,393
Likes: 4,213
From: Clayton MI
Moving the housing is to adjust the gear mesh not the speed. You need the correct gear to match the axle gear ratio.
https://www.moparpartsgiant.com/part...n_housing.html
https://www.moparpartsgiant.com/part...n_housing.html
The markings on the trans/sensor, correspond to the tooth count on your driven gear, so it is properly indexed against the drive gear. Try and put it in the wrong place, and you get anything from won't go in at all, to goes in, but speedo doesn't work.
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Grand Champion
Joined: May 2019
Posts: 5,146
Likes: 721
From: S.W. Indiana
Yep. This. There is a chart for the driven gears on TransmissionCenter.net.
The markings on the trans/sensor, correspond to the tooth count on your driven gear, so it is properly indexed against the drive gear. Try and put it in the wrong place, and you get anything from won't go in at all, to goes in, but speedo doesn't work.
The markings on the trans/sensor, correspond to the tooth count on your driven gear, so it is properly indexed against the drive gear. Try and put it in the wrong place, and you get anything from won't go in at all, to goes in, but speedo doesn't work.
Like I said earlier, I'm not going to worry about it. I have a rather heavy foot causing me to drive in a ...um....spirited...manner at times. It keeps me honest, well, avoid tickets.
Administrator
Joined: Apr 2010
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From: Clayton MI
Thread Starter
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Grand Champion
Joined: May 2019
Posts: 5,146
Likes: 721
From: S.W. Indiana
Oh....I can drive 55 alright. The speed limit might be 30, but I CAN drive 55.
