There are two sensors if I recall correctly. The RWAL which reports the speed of the vehicle and then a sensor that reports driveshaft speed.
2WD has the trans sensor in the OD unit and the 4WD has it in the t/fer case.
Lose the trans sensor and the trans is in limpin/default. Loose the RWAL sensor and you lose the speedo.
If I recall correctly when changing the axle ratio you have to compensate by telling the PCM what the ratios is. I think that is what Ron was thinking - regarding the "pinion factor" which is normally the term we use on the FWD -
The algorithm in the PCM uses shaft speed to control shift schedule. You may not see a big difference by leaving it where it's at - but if you do you can change the factor to dial it in.
There's only 300 rpm difference at 70 but if a problem I guess to the dealer I go. Moved the van around today, went into drive ok, a little slow into reverse (2 sec.) whines while moving and fluid is black. I'm definitely pulling the trans, but any ideas before I get it out? I changed out the pressure valve? solenoid? (a gm hybrid affair) in my 06 diesel, does the 01 trans have the same thing? Any good upgrades for the trans?
Thanks
Mike
