Ideally they should be quiet from the start, but some gear brands can be noisy.

 

after this initial 30 minute cool down, could I drive about 200 miles without stopping. Or should I stop and let it cool down in 30 minute intervals.

I'm picking up my truck today with the new 4.56s.

 

It is up to you. Some people say just drive it, and some people say break it in. I broke in my 4.56's a few weeks ago properly.

 

How in the HELL are you guys crushing the crush sleeve. I tried everything. I tried putting the floor jack under the breaker bar and using it to push up to tighten the nut. I even went and got a impact gun rated at 580 ft-lbs, turned it up to 130 psi, and nada. So I reused the stock crush sleeve and it seems to be working okay.

And this writeup says to use 3 quarts of gear oil. I could only fit in 2, then another half quart after a quick test drive, so 2.5 total. This was to the bottom of the filler hole, not the 15-40mm lower like recommended. Perhaps my pinion is rotated down lower than yours. I have 6* shims on mine.

 

An impact will crush it. It goes hard at first. You really shouldn't use the old crush sleeve.

 

Well if 580 ft-lbs doesn't do it I don't know what else to do. I searched on here and lots of people resuse the crush spacer w/o issue. My gears seem to be working out, dead silent and good contact pattern.

 

I reused mine since I couldn't crush the new one.enough... Just be careful when installing the pinion nut not.to over crush it

 

My Snap on MG725 is rated at 810 FT LB of working torque. As mentioned, It takes some doing but mine did the Job were others failed. We were not able to start crushing it any other way.

Believe me, we tried putting a 4ft cheater bar on a 2 foot breaker bar and barely moved it...

 

Thanks for the write up! I used this for my truetrac/4.10 install. I had to use the shims that came with my master install kit because the trutrac posi was too large to acomodate the factory shims. Took me three hours to get backlash right ! I see why shops charge so much for this. Double the traction makes it all worth it!

 

THANXX MANN....... Been Frettin'Badd since blowin out my 14 under my half-ton 06' CC v-MAXX. Im doin mine!.....& when Im done. Im gonna put that, tuned up LQ9, on the limiter & lett gett summ! ! ! ! ! ThisBiggBlakk PikkUpp LUVZZ ITT...........