Changing gears in a D44/12 bolt K5

[rjpastor]

OK, before someone gets his panties in a bunch, I did search for this but didn't find what I am looking for. I am about to put 35s on my 76 Jimmy w/stock axles. I'm guessing the ratios in the D44 and 12 bolt axles are probably 3.08s. I'd like to go to 4.11s. From some of the things I've read, it seems I might need different carriers than what I have (something to do with "the break"). Can someone verify/dispute this?? I'd like to know what I'm getting into.

 

[bigblock72]

You'll need new carriers front and rear if they are currently geared 3.08s.

Carrier split on a dana 44 is at 3.92 and on a truck 12 bolt is 3.42 I believe.

 

[Hogback Fabrication]

You don't NEED new carriers front and rear, they make "thick" gears (or ring gear spacers) for just about every diff out there.

There are carrier splits for both the 12 bolt and D44 but anyone that sells ring and pinions should be able to give you the info you need.

 

[chalet2506]

just my .02, but you need to pull the covers and verify what you currently have before you start putting any effort or money into regearing.

 

[rjpastor]

I had planned on it. My rig is registered as a 76, but has some 77 parts on it. I've learned to check parts and/or take the old one with me to get replacements. I'm just trying to figure approximate costs so I can save up.

Thanks for the info.

 

[pauly383]

you WILL want more than 4.10's with 35's

 

[rjpastor]

I was going with 4.11s because I use it alot on the street and will have to drive freeway to wheel. Suggestions are welcome (I'm not proud - tell if I'm wrong).

 

[BlazerBud]

I was going with 4.11s because I use it alot on the street and will have to drive freeway to wheel. Suggestions are welcome (I'm not proud - tell if I'm wrong).

If you plan to change gears yourself, and you've never done it, get some help from someone who has. Make sure they have had good service out of gears they installed. This is the "acid test". It has to be correct. Get it right and it can last 500,000 miles. If it is done wrong, they will wear out in a thousand miles.

 

[rjpastor]

My kid's a mechanic and has a buddy who does them all the time, so I think we're ok. Again, all suggestions/info are appreciated, particularly info/opinions about ratios.