transtalon wrote:One shop in IL showed the difference in the ring and pinion gear between the two. The Ford 9 looks to be more wider and beefier gear tooth than the Dana.
That is the reason why the 9 " is a stronger rearend. This is the reason why I am asking for the ones that had both or had an experience on both rearend. Thanks.
So you are saying the Dana 60 is the stronger rear?
It's not stronger, and once you get to aftermarket 9" the rings and pinions are cut differently then the factory version, Either way the 9" is not stronger .. .
if i show you a 5.88 ring vs a 3.08 ring all that is showing you is the thickness needed to make the pinion smaller to spin faster, increasing the car/motors ability to accel quicker....
That was stupid to compare, i'd be leery of that shop .
Im going to have to get specific..... The 9' is popular ONLY because if you road race or SS race and want to go from a 3.70 to a 3.80 guess what, you can, if you want to go from a 4.20 to 4.29 you can, it just has every imaginable gear ratio possible.... I road race and drag race and i don't need that many gear choices, of all my customers a handful have more than 1 set up for the 9" and the 8.75. Only 2 really change them out for the other ratios they have.
That is what makes it popular, every 9" i do i never see the customer back for any of that need for all that gearing. . .
Now, the 9" has a unit bearing like design on the pinion, which sucks, and it NEEDS that 3rd bearing, it is NOT there as an added extra benefit, it MUST ALWAYS be there, and when that 3rd bearing fails, you need a New Gear case, gears, Driveshaft and trans...
When, if you break a Dana, you need gears. . . .
The 9" has a extremely low pinion that when used with a stock factory gear has a huge area of contact, and that also makes even more drag, but that is where it's strength is and thats it.
Aftermarket does not cut gears the same way and that loses some of that contact area, but it still has the loss, and extreme pressure on that pinion....
The pinion is short and not as strong as the Dana 60, the Dana has a bearing spread that holds the pinion gear better and more stable.
The dana is 9.75 in diameter and the 9 is 9, the dana also has larger internals as for spiders and clutches, but for racing and a spool that doesn't matter
Here watch what happens when a 9" screws up, vs a Danahttp://www.youtube.com/watch?v=xsnxKkFK ... h_responsehttp://www.youtube.com/watch?v=k6CnpWOG ... ure=relmfuhttp://www.youtube.com/watch?v=jvZCpN7VASY
I have never ever seen a Dana 30 thru 80 send a pinion gear out of the case, i have seen the 9" do it, and send the carrier out and also just break.