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Free!!!! - http://www.sram.com/_media/pdf/rockshox/dealers/TM_MY09_E.pdf

That is the 2009 RS tech manual. Gives a breakdown on all their forks and is very thorough. Go to the spring service section for your particular fork. Going from 80 to 100mm will require you to remove the 20mm(or two 10mm) spacers from the air shaft.

There is a way to make the change without removing the lowers. You'd have to do a search to find some info on that. Good luck.
 

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Here you go. This is from my reply to another thread on this subject.

Is this for the new 32mm SID? If it is, those are '09 models. The '08 model was still the old 2nd generation noodle.

If it is the '09, then changing the travel on it is pretty easy. To do it the ghetto way, you'll need a deep 10mm socket, a large adjustable wrench, measuring cup or syringe, a rubber mallet, and 15w fork oil.

Ghettotastic:
1. Using the deep 10mm socket, loosen the long nut as the bottom of the negative air stem, and unscrew it all the way to the top of the stem.
2. Release all air from the negative and positive air chambers.
3. Using the large adjustable wrench, remove the left side top cap, and drain the oil inside.
4. Put the 10mm socket back on the nut you loosened, and then hit it with the rubber mallet to break the rod free from the bottom of the leg. Oil will come out.
5. Push the rod and piston up and out of the fork. You might need to use a long punch or rod to gently push the piston and rod up through the leg.
6. Remove the black elastomer bottom out bumper, and remove the black plastic travel spacer under it.
7. Reinstall the black elastomer bottom out bumper.
8. Wipe any dirt off the rod and piston, and lubricate the o-rings with 15w fork oil.
9. Reinsert the piston and rod into the fork leg.
10. Invert the fork and pour/inject 5ml of 15w fork oil through the hole where the negative air stem comes out. You might need to push the air stem into the fork to make enough room. I use a piece of tube and a syringe.
11. Install the negative air stem nut and snug it down.
12. Pour 5ml of 15w fork oil on top of the piston.
13. Reinstall the top cap and tighten it down. Lube the o-ring on it with 15w fork oil.
14. Inflate the positive air chamber to about 90 psi.
15. Torque the negative air stem nut to the proper tightness.
16. Inflate the negative air chamber and set sag.


To do it the SRAM sanctioned way you'll need a deep 10mm socket, a 24mm socket, a rubber mallet, a long 5mm allen wrench, a measuring cup or syringe, a rubber mallet, an in/lbs torque wrench, inside snap ring pliers, and 15w fork oil.

Non-Ghettotastic:
1. Using the deep 10mm socket, loosen the long nut as the bottom of the negative air stem, and unscrew it all the way to the top of the stem.
2. Pull rebound adjuster off fork, and use 5mm allen to loose nut.
3. Release all air from the negative and positive air chambers.
4. Using the large adjustable wrench, remove the left side top cap, and drain the oil inside.
5. Put the 10mm socket back on the nut you loosened, and then hit it with the rubber mallet to break the rod free from the bottom of the leg. Oil will come out.
6. Do the same thing on the damper side using the 5mm allen instead of a socket.
7. Pull the lowers off the fork and allow them to drain completely.
8. On the bottom of the stanchion, while pushing up on the black plastic cap, use the snap ring pliers to remove the snap ring. Pull the air piston and rod assembly out through the bottom of the stanchion.
9. Remove the black elastomer bottom out bumper, and remove the black plastic travel spacer under it.
10. Reinstall the black elastomer bottom out bumper.
11. Wipe any dirt off the rod and piston, and lubricate the o-rings with 15w fork oil.
12. Reinsert the piston and rod in through the bottom of the stanchion.
13. Reinstall the black cap, washer, and spring washer, and then reinstall the snap ring, making sure the rounded edge is facing up toward the black cap. Rotate the cap if necessary to seat snap ring is recess on the black cap.
14. Lubricate the foam rings under the wipers of the lowers with 15w fork oil, and reinstall the lowers.
15. Invert the fork and pour/inject 5ml of 15w fork oil through each hole in the bottom of the fork. You might need to push the air stem into the fork to make enough room. I use a piece of tube and a syringe.
16. Install the negative air stem nut and damper side nut and snug them down.
17. Pour 5ml of 15w fork oil on top of the air piston.
18. Reinstall the top cap and tighten it down to 65 in/lbs. Lube the o-ring on it with 15w fork oil.
19. Inflate the positive air chamber to about 90 psi.
20. Torque the negative air stem nut to 45 in/lbs.
21. Torque the damper side nut to 60 in/lbs.
22. Push the rebound adjuster back into place.
23. Inflate the negative air chamber and set sag.
 
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