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What is install parts & Cryo Treated ?
What difference 02-03 housing and 04-07 ???SHOULD I ORDER "Upgrade" ?

THANKS !!!!

 

Install parts are the parts you need to install the final drive gear into your differential.

And the 04-07 housing is supposed to be stronger than the 02-03.

I think cryo treated is a procedure they do to make the gears stronger and make them last longer, lots of people here say its worth it.

 

cryo treating is using nitrogen (i believe) to cycle the parts through subartic temperatures which in turn makes the metal molecules bond better thus creating a stronger part

 

Make it as strong as you can so you have no worries. So do the comptech or puddy mod along with the better housing ap2 and cryo. I did the 4.77's and my car is much more fun to drive. The 4.56 are a good option as well, they may make a small amount of noise but they are a stronger gear.