I needed to match the rear of my truck to the front. So I needed a lift without cheater blocks. So a Shackle mount flip and a longer shackle will be done.
I first got my mounts from http://www.gatsbycars.com/dodge.html
The rears are exactly the same as Ram full size trucks. I can verify the bolt holes are perfect. 1/4in thick nice and strong. Easy bolt in no welding or drilling (if you want that is).
I also got 12 Grade 8 1/2in bolts. Stock brackets only used 4 of the 6 holes. I might as well and use all 6 bolts for extra strength.
So first I started by removing the bed. I didn't want to be grinding with the grinder in my face. I was so easy to remove with a few friends to help lift it.
Next came out the cut off wheel to cut off the rivet heads off. The tops very easy, lowers to some time. Gridded down the rest of the heads and knocked off the stock mount. Then cut off the rest of the rivet body, cut it close to frame without gouging into it. Got a punch and a good hammer and only took a few hits. Each side 15mins. Very easy!!!
The frame holes are slightly under 1/2. Just had to run the drill to make exactly 1/2in. Dropped in the stock 4 and drill the other 2, with the mount as the perfect template. Dropped in the last 2 and tightened them all down.
Put the bed back and reinstalled the stock shackles. For me I need more so I didn't bolt them up, just used the bolts to mock up. I got 3.25in more lift with stock shackles. I will order a Rams 2in lift shackles. The only note I need to say is the Dakota stock shackle hole is 1/2in with the thread smaller. The new mount is 5/8. The lift shackles will fix this, but if others want to use stock bolts may need to use some kind of insert to keep it centered.
Here is a before and after the rear shackle flip.
Another option is just using your stock mount and just turn it upside down. A Ram owner said 2in lift.
Or use a 2wd shackle mount or the front style of the both trucks. You can cut them off of a junkyard truck. But a new replacement bracket is easier to get a hold of.