I have a 2 seat 05 savage with 091 trans and 2.0 subie, 930 cv's. My problem is there is a slow knock that can be heard. You hear it best in 2nd gear about 3000 rpm's and up. At 3000 rpm's it starts off slow (does not match wheel speed much, much slower) then, the faster you go in 2nd the knock will speeded up but, still slower then wheel speed. You can also hear it in 3rd with the same results as 2nd.
This all started when I pulled the trans to fix the rear mount on the trans and replace the three broke studs they used for there mount setup. Before I fixed this there was no problem. After I fixed the mount there is the slow knock.
Not sure if it is inside the trans or the axle (when I move the axle side to side you can hear the axle knock the cv flange which all most sounds like my problem).

Did you move the tranny at all? Did you assemble the CV's correctly? Did you grease the cv's once you put them back together? CV angle? Micro Stub carrier bearing? Did you remove the bearing housing and or check it for play? Sounds to me like its a cv problem. Double check you assembly. go to: http://www.outfrontmotorsports.com/cv_assembly.htm for a how to for cv assembly.

Did not remove cv's from axle. I just unbolted the cv and put it aside. I removed the trans from the car, made a new mount and replaced the broke studs. Then, I put the trans back in. With this rail I did not have to remove the motor. This was a very easy fix.
After thinking about it a little more, it all most sounds like the clip came off the axle and the axle is slapping the cv flange. Not sure if that is it since the slow knock is steady.
Any other thoughts would help when I look into it this weekend.

Put the car on stands and turn the tires by hand and see if you can reproduce this. Since it's a slow sound it's nothing in the engine or trans, something there would be much more frequent. So it's probably something in a hub or in that general area.

Did you torque everything when you re-assembled it? I would re-check everything you touched and then check everything else. If you have stub axles, then definitely check the axle nuts. And while I'm thinking of that, check to make sure there isn't any slop here by seeing if you can rock the rear tire the same as if you're checking a front wheel bearing for slop.

When you removed the axle, did any of the ball bearings come out? Might want to disassemble and make sure it is assembled correctly. Also, did the CVs get removed from the axle? This could be an issue if the CVs were not clocked correctly...

This sounds like what I had going on. Try this: Put the car up on jacks so the wheels can turn but at ride height. Then run the car in gear so the wheels are turning. With the wheels turning grab the CV shaft and push it to the outside and listen for the knock. I grabbed it with a rag so it would slide in my grip and I could put some pressure outward on it. Be carefull. I found I could re-produce the sound this way, and I learned that if I would slide the shaft up to the inside and put a zip tie on the upper CV boot to hold it away from rubbing on the outside cup the sound would not be there. The shafts will slowly creep down and then the noise will come back, but they stay put for a while. Maybe this is what you have goin on too.

All my slow knocks with my 091 have been trans related. The last one was missing teeth on the pinion, a ruined main shaft bearing, and then some misc gear stack damage. It sounded like a CV issue. It would disappear if I drove it in a circle to the left. I even drove it to the wall and hammered the shat out of it with five full sized adults in it because I was convinced it couldn't be the trans. It finished the weekend with no problems. I even bought a new set of CV's because my old set was 8 years old....now I have a good spare set.

I have eaten bearings out of hubs and lost CV bolts and lost the main bolt in the front spindles and driven on three cylinders and blown shock seals and no nitrogen in the shocks and a burnt idler bearing and destroyed uniballs and heims.....

IMO-slow knocks = trans issues

Turn the stereo up

You sound like the old fart mechanic that used to work for us. Every time we would tell him we had a sound coming from the truck he would look at us and say "Well young'n its like this (little pose) Turn the radio up" and then walk away. Gota love that old fart.

Thanks for the input guys.
Did not work on the rail last weekend, work and honey do's Who was the dumb a** that came up with that word, because it sure does not taste sweet when you are doing the work.
Hopfully this weekend I will get into it.

Well, finally got to look into the problem. Looks like it is the trans, acts like the pinon gear. I pulled of one axle, put it into gear and held the other axle and filt the axle clicking. Not a good sign. Oh well, time to pull and fix. Does anyone know what the cost is, more or less to fix the pinon gear.

You do mean replace the pinion gear right? I've never heard of one getting fixed.

The trans needs to come apart and inspected first, then you have an idea of repair cost.