I registered on here today thru suggestions from guys over on 67-72chevytrucks.com and Dieselplace.com, so here's my 1st list of questions...

I'll be putting stronger axles in my '72 K20 and it still has the factory D44/Eaton combo. The only hard core action it will see is hooking to a sled.

I understand that any GM D60 will bolt up, but is there anything I need to be cautious about? If I can only come up with a Dodge 60, will I only have to relocate the spring perches and shock mounts?

As far as replacing the Eaton...I will only do that if I get a good deal on a set of axles, or no one can give me a list of everything that will interchange between an Eaton/14B. I have also heard there are certain 14B's I need to stay away from. Which ones?

Thanks in advance for any help, and good to meet ya'll!

Here she is...http://www.dieselplace.com/forum/garageimage.php?do=full&p=29899&d=1176671090

14 bolt for sure it is easier to get parts for and simple to work on. Many more resources around if you have problems. Read THE BIBLE. Only draw back to a 14 bolt is the center of the third member hangs awfully low but you can shave it if desired. But none of that will affect you pulling a sled.

I don't know much about sled pulling, is weight a big thing? If so the Eaton weighs less than the 14 bolt. I prefer the Eaton myself...not to mention you can get a 5.14 chunk at the junkyard for cheap, probably should snag some spare shafts too (never know).

Come to think of it, I've heard of 14 bolt shafts breaking, but never heard of or seen an Eaton shaft break.

I don't know much about sled pulling, is weight a big thing? If so the Eaton weighs less than the 14 bolt. I prefer the Eaton myself...not to mention you can get a 5.14 chunk at the junkyard for cheap, probably should snag some spare shafts too (never know).

Come to think of it, I've heard of 14 bolt shafts breaking, but never heard of or seen an Eaton shaft break.
You want as much weight in the front as possible because the weight box gets to the top of the sled, the sled will take weight off the front and really load down the rear. the more your truck weighs, the more momentum you carry down the track and it's harder for the sled to stop you...but you better have the power to move the extra weight. Pulling and crawling are different, but the same. It's all about finding the right "happy medium" of weight /power/traction. Thanks for the replies guys.

As far as replacing the Eaton...I will only do that if I get a good deal on a set of axles, or no one can give me a list of everything that will interchange between an Eaton/14B. Here she is...http://www.dieselplace.com/forum/garageimage.php?do=full&p=29899&d=1176671090

Anything inside the carrier interchanges. And once you've got 14b side gears (or detriot), you can run 14b shafts- you just need to find ones that are the right length or shave down a set. You can also run any 14b disc brake conversion kit.