OK..SO I'VE GOT A 2:59 RING GEAR

[bucket]

THIS IS THE WORST POSSIBLE REVELATION..
WHAT ARE THE RESTRICTIONS ABOUT WHEN CHANGING GEARS???
THE SPEEDO
THE COMPUTE?R CONTROLS?.
AUTO TRANS SHIFTS?
LIMITS AS TO WHAT GEAR WILL PHYSICALLY FIT IN MY CURRENT CARRIER?

 

[vetteoz]

They make "thick " gearsets to fit 2 series carriers; for 3.73 and taller at least
All you have to change is the speedo gears in the trans to suit new rear ratio.
All the ECM needs is to see the correct road speed. for it's calcs

 

[bucket]

ALL THE GEAR SETS I'VE SEEN ARE FOR2:73 OR LOWER ONLY....
WHY???

 

[vetteoz]

ALL THE GEAR SETS I'VE SEEN ARE FOR 2:73 OR LOWER ONLY....WHY???

Dana 36 : JTs Parts & Accessories, Justdifferentials.com
From the factory 2 series gears go on 2 series carrier
3 series gears go on 3 series carrier
The thick gears let you put aftermarket 3 series gears on your 2 series carrier without having to do a carrier swap