ok this is all copied from nasioc.....
but it describes the problem im having, and noone seems to be able to help with this... even tranny shops dont know how to fix this
But im in great need of the CLUBDUB Family so any ideas are helpful
have a problem putting power down in my wrx.. we think it may be the differential snap ring or whatever.. when i got on the gas this morning on the way to work, if i jumped off it quick.. i would hear a clunk in the rear end. after it did this a few times, i would experience a hard time putting power down... it would spike rpm wise, but no forwards motion would result. i would have a hard time going away from stop lights, hills were a problem.. and i would hear a funny noise from my clutch.. the same noise i got when it let go at nccar. funny grumbling noise..
but it is intermittent... it worked fine for a few days. then it acted up again.the clutch is new.
Check that your one of your axles hasn't popped out. This sounds almost identical to the issue I was having. Turned out that the driver side axle would pop out on occasion, and Id get a weird vibration, grumbling noise. I drove mine for a week or so with it doing this and ended up replacing the viscus clutch in the transmission, rear drivers side axle, and swapped the rear end out with another as the end of the drive shaft was all chewed up and figured the differential was also damaged inside. I now know there is a TSB about the axles popping out.
I hope you caught it soon enough and didn't do what I did.
Third Post(This is quoted directly from a paper i recieved with my new clutch)
SOURCE: Subaru Tech Tips
TITLE: Clutch Appears to Be Slipping
APPLIES TO: Impreza WRX
If you encounter an Impreza WRX with a customer concern that the vehicle's clutch slips under hard acceleration but drives normally under light acceleration, it might not be the clutch that's the problem. Before you yank the transmission to get to the clutch, put the car on the lift. Start the engine and put it in gear. Release the clutch and see if all four wheels are turning. If they are not, inspect the one that is not turning. The Technical Support Line has received a couple of calls with the above concern and in both cases the retaining clip on the inner end of the rear axle shaft has come off. This allows the axle shaft to move outward slightly to disengage from the side gear of the rear differential but, the wheel bearing retainer assembly will not allow the axle to come out completely. Since these vehicles have a limited slip rear differential, there is enough drag on the axle to move the car under light acceleration but not under heavy acceleration.
The repair is simple. Just push the axle inward and it should reengage the retaining clip. If this procedure does not work, then you will need to remove the rear differential cover to re-install the clip and/or examine the axle. If the vehicle is an Impreza WRX STi, you might find that the vehicle won't move unless the DCCD is in the 'Manual' mode. In this case the cause may be a failed rear axle shaft or joint assembly
im having the same problem right now, i spent 400 on a clutch and 200 on a flywheel, and 800 to get it put in the problem was still occuring, we put it on a lift 3 tires spun just fine, except the front drivers side it would spin then stop slowly spin then stop, so i know its not connected i got the same tech tip paper with the clutch i bought but that on refers to the rear differential, how do i reengage the front retaining clip?
i need help guys really bad, thgis is my families only means of transport, and im spent on cash right now, any ideas? ive done as much research as i can, cant find anything on the front differential retaining clip