Installing gears:please help!

[blazerpro79]

well i blew out my 4.10s last week, and i decided 4.56s would suit me better anyways. we are installing them right now, and i just wanted to know what you guys ended up using to shim it.
1979 k5 - 12 bolt rear - had 4.10s and now is going to use 4.56s.

i was told 30 thousanths of an inch would be good but its not lining up right.. i dont have a press here, so we had to run to a shop yesterday and have them press the pinion bearing on, and .0030" was too much. so i ask, what did you guys end up shimming yours with? thanks in advance

 

[74 chev]

in my front dana 44 i just used the same thickness of shims that were on the old 4.10's and i got lucky it came out to 11 thousandths backlash but i just left it and its doing fine. just my experience with em.

 

[Hogback Fabrication]

Its different for every rear end. It sounds like you don't really know how to set up gears, so I would recommend looking up how to do it right (there is a writeup in the tech section of pirate4x4.com) or getting someone to help you that knows how to do it. Also, the backlash is not what determines if a gearset is setup right. You need to run a pattern as well to determine if the pinion depth is right.

 

[6.2puller]

I agree with above. The reason we shim the gears is to make up for the machining differences between carriers and gear sets. Thus every setup is different. You don't need to go to Pirate 4x4 though becuase their is one right here in CK5s tech section. http://coloradok5.com/forums/showthread.php?p=1416510#post1416510