I am going to change out the front Differential fluid....My owners manual says to use a different fluid if I have "A.D.D" what does it mean and how do I figure out if I have it? thanks, Garth.
what does A.D.D mean? 96 4runner
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Matt60
KiSS of Death
automatic disconnecting differential
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Thanks Matt60...Now how do I know if I have that...I have never heard of that before...
you have it if youve got the 4wd button on the tcase lever. your 96 does have it.
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Thanks...But my 96 does not have it! Strange...
I thought all 4runners had ADD regardless of the 4WD button... What kind of system is present on those that don't have the 4WD button on the shifter?
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Attention Deficit Disorder - SOMEONE had to say it! 
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just talked to another dealer...he said it would say "ADD" on the outside of the wheel hub...I gave him my VIN# and said he thinks mine has it...lol...FWIW!
I dont have a button (I have a stick) and I have ADD. If you have selectable hubs then you dont have ADD if you dont then you do have ADD.
You guys crack me up It has nothing to do with the transfer case button, or lever.
Automatic Disconnecting Differential (ADD): A 4WD system found on many Tacomas and 4Runners. Whereas traditional 4WD systems utilize manual locking hubs that must be locked by hand, the ADD system utilizes live hubs that are always locked. What this means is that even in 2WD, while moving, the driver-side and passenger-side axles and the differential are always spinning (the front drive shaft does not spin in 2WD). When in 2WD, although spinning, the driver-side axle is disconnected from the differential via a vacuum-actuated or electronically-actuated sleeve. When shifting the transfer case into 4WD, the front drive shaft is engaged, and the ADD actuator forces the sleeve toward the passenger side of the vehicle, effectively locking the splines of the driver-side axle with those of the differential.
And to answer your question gogle, Yes, you have ADD!
It has nothing to do with the transfer case button, or lever. Automatic Disconnecting Differential (ADD): A 4WD system found on many Tacomas and 4Runners. Whereas traditional 4WD systems utilize manual locking hubs that must be locked by hand, the ADD system utilizes live hubs that are always locked. What this means is that even in 2WD, while moving, the driver-side and passenger-side axles and the differential are always spinning (the front drive shaft does not spin in 2WD). When in 2WD, although spinning, the driver-side axle is disconnected from the differential via a vacuum-actuated or electronically-actuated sleeve. When shifting the transfer case into 4WD, the front drive shaft is engaged, and the ADD actuator forces the sleeve toward the passenger side of the vehicle, effectively locking the splines of the driver-side axle with those of the differential.
And to answer your question gogle, Yes, you have ADD!
Duane
IH8MUD Wookie
gogle..I hope flatland meant you had A.D.D.
Bythe time I was done reading that reply I forgot what diff fluid we were talking about or why anyhow.
I think bowyer and I made it through school prior to ADD and ADHD diagnosis or else I'd still be tring to get off the ridlin with nicoret patches or at minimal 3 daily doses of cooking sherry
Bythe time I was done reading that reply I forgot what diff fluid we were talking about or why anyhow.
I think bowyer and I made it through school prior to ADD and ADHD diagnosis or else I'd still be tring to get off the ridlin with nicoret patches or at minimal 3 daily doses of cooking sherry