unit31

Im doing a dana 30 low pinion gear change. Its a tj with factory 3.07 gears. Im replacing them with a used set of Dana 4.10 gears and carrier from another jeep. Here's my issue. When I use the pinion like it came from the other jeep im a little too shallow. The oil slinger is .060. With that my drive side is on the heel and my coast side is in the toe. If I add a .005 shim, thats the smallest shim I have it somewhat centers my pattern but leaves me with a long sharp flat edge on the bottom of the mark. My expierence tells me that my pinion is too deep when I don't get the oval mark but a sharp line. I'm not sure where to go from here, I've been screwing with it so long now that I have melted my brain. I have done quite a few gear changes but never on the front or with a dana 30. I have seen on here where guys recomend tossing the factory .060 oil slinger for a smaller one and shimming up from there. Im just not sure where to go from here. Ill try to put a pic up of what the gears look like now as soon as I figure out how.

unit31

ok I tried to upload a pic, not sure if it made it.

SeriousOffroad

You need a much thinner slinger.

A straight line across the bottom definitely indicates the pinion is too deep.

unit31

Thats what I thought too. I have a .030 slinger. I guess I will start with it and add a few shims. It just puzzles me, the 4.10 pinion came from another tj and I left the factory slinger on it thinking Dana had used the .060 slinger in their original setup. I had planned on switching slingers I just wanted to hear someone else say the same thing I was thinking. I hear of people using about .035 shim on the pinion depth with these dana 30's. I just never could figure out if they are counting the slinger or not. I had planned on starting at about .050 by using a .030 slinger and .020 shims, because right now with the thick slinger I am at .060. Thanks for the input.

SeriousOffroad

Please don't take this the wrong way, but are you 100% sure that the gears you are installing are the right rotation?

unit31

No I haven't really thought about it. I have done several rears but never a front. These gears came from another tj. Im doing these for a friend and he got them so I can't be sure. If it helps, my drive side is the sloped side that would usually be the coast. I thought that was odd but I noticed on another forum that the dana 30 low pinion drives on the sloped side with the coast side being the more straight up and down side of the tooth.
No offense taken by the way.

SeriousOffroad

STOP!
Can you please send me a pic of the ring gears side by side?

Something doesn't sound right.....

SeriousOffroad

My concern is that you have 1 set of standard (LP) and 1 set of reverse (HP). They are not interchangeable.
The gears on left are low pinion, right is high pinion.


The gears in the pic are for different axles, but the pic does show the difference in the tooth direction.

HTH

unit31

Sorry no more pics. I think I got the right gears. I know the pic I put up of the pattern is bad but you can see the direction of the teeth in it. Im pretty sure they are the right gears. I wish I had them out I would post a picture.

unit31

Like I said, its driving on the coast side. The hp dana 30 drives on the drive side so I pretty sure I have the right gear. I think I just need to decrease the pinion depth and keep adjusting backlash until I can get a decent pattern. This thing has been a pain in the rear. I also would never recomend a motive brand instal kit for this axle. It only came with five pininon shims and no slinger. I had to get a buddy to bring me a .030 slinger and shims from one of his kits.