I have been searching all over and have read the tech articles concerning defeating ADD. My 4-wheel drive has failed to engage for what is now the 4th or 5th time and this has become a major reliability issue. I want to do things right and cost is not the utmost consideration.

ErikB previously posted:
"If you permanently engage the ADD mechanism(and if the hubs are locked if you have manual hubs), or if you do the same by swapping in an axle that doesn't have ADD, the front and rear driveshafts will always be spinning the same speeds so you can easily shift in or out of 4wd at any speed. Its actually easier since you don't have to put pressure on the shifter to engage the synchro (clutch/brake)."

I was under the impression that all T-100 came with ADD so how does one swap in an axle without it?
Assuming this would be everything but the third-member, can anyone recommend the best components to use for such an upgrade? I already have Aisins.

I don't drive my truck much annually (~4K) but when I do it has to be rock-solid. I also intend to keep it many, many years and don't want to have to continually source vacuum lines, solenoids, etc. another 10-15 years from now. Thanks in advance. Thanks in advance. Brew <img src="/forums/images/graemlins/cheers.gif" alt="" />