Question for Bob, John, or anybody, about the tone ring in the rear axle...
#1
Question for Bob, John, or anybody, about the tone ring in the rear axle...
I have a question for those in the know, I need to know what exactly the tone ring in the rear axle controls on a 99 4x4 Auto w/4wheel ABS.
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
#2
Originally Posted by rngprerunner
I have a question for those in the know, I need to know what exactly the tone ring in the rear axle controls on a 99 4x4 Auto w/4wheel ABS.
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
#3
#4
Originally Posted by rngprerunner
Yup, that I know. That is why I am hoping someone here will have access to the manuals and know specifically what 99 does.
#5
As far as shift points are concerned I was told by Fredness that the tone ring does not affect them. When ordering my bama xcal2 Fred informed me that he would not be able to correct my speedo because I have a 98. Having an automatic I was concerned if this would affect my shift points, however, he informed me that the shift points are determined by engine speed and not vehicle speed.
#6
Originally Posted by rngprerunner
I have a question for those in the know, I need to know what exactly the tone ring in the rear axle controls on a 99 4x4 Auto w/4wheel ABS.
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
I know it controls the ABS, but I'm not sure if it controls anything else like shift points and what not as it does on other trucks.
Thanks!
The two primary inputs to the shift point calculation are throttle position and corrected vehicle speed. So, in that sense, the ABS sensor is directly related to the shift schedule.
#8
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#12
Originally Posted by rngprerunner
That is a good point there about the transfercase...
I was always under the impression that the 98-00's took the speed from the transfercase already, and that was the reason why you couldn't reprogram the speedo on them with a programmer like you can newer trucks.... hmmm...
I was always under the impression that the 98-00's took the speed from the transfercase already, and that was the reason why you couldn't reprogram the speedo on them with a programmer like you can newer trucks.... hmmm...
95~97 use a gear driven signal generator on the trans or transfer case, so the speedometer correction is done by interchanging the drive and driven gears, similar to a cable-driven speedometer correction.
98~2000 do the correction in one of two modules. RABS trucks do it in the GEM; 4WABS trucks do it in the 4WABS Module. A savvy dealer service department should be able to access those modules to do the correction but an aftermarket flash tuner (such as the SCT) cannot because it only changes the PCM program.
#14
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