| Following are painfully detailed
instructions on installing a Factory Short Shift into a 1978 911SC. They should be
applicable for model years 1974 to 87. This particular car had a "lesser"
(crappy, not the Weltmeister) short shift kit already installed. If yours doesnt,
just disregard all references to the "aluminum spacer block".
Things the Factory SS kit includes:
Things you WILL also need:
Things you MAY also need:
Note: Shift coupler can be easily inspected before you order anything. You may want to order the other bushings in case you find out the old bushings are bad once you have the shift tower apart.
Beer comes in handy too, particularly in the adjustment phase.
1. Remove center console if you have one. 4 screws around the perimeter of the back cover piece (where it joins the main console piece), pull off cover piece, then 2 screws holding down the back of the console and one (under the carpet) holding down the front. The front screw can be tricky because the parking brake handle will be in the way.
2. Remove old shift knob. If this looks to be difficult you might be wise to order a new one to keep handy & return if you dont need it. Mine was loose, so no problem removing it, but I broke the end of the sleeve part when reinstalling it on the (slightly larger diameter, apparently) new lever. You will need a new "crush sleeve" (interference fit sleeve) either way since youll probably mangle the old one getting the knob off.
You can probably avoid the breaking of the shift knob by waiting until after step 13, given that you have a vice in which to hold the old lever whilst you tap the knob gently off. You could also use a gear puller with a bit of wood or something under the center "push" part to prevent damage to the knob, but likely a soft faced hammer or a bit of wood used as a buffer will do the trick.
3. Remove shifter boot.
4. The "late-style" (dont know exactly how late) shift tower has a locknut and allen bolt that position the forward end of the longitudinal pivot axis. If you have this type of tower, use a 22mm socket to loosen the locknut BEFORE you remove the tower from the car. I had to reinstall my (empty) shift tower just to get enough leverage to crack the nut loose.
5. Apply the parking brake and shift into neutral. This will allow you to pivot the shift rod side-to-side as needed to reinstall the shifter later.
6. Remove the 3 big Allen-head screws (6mm wrench) that hold the shift tower to the car - two on the front side of the plate, one on the back. At this point the tower should be loose, though it wont come off yet since its still attached to the bracket that holds the front bushing for the shift rod.
7. Remove the 2 smaller Allen-head screws (5mm wrench) that hold this bracket to the shift tower. On my car, these screws went through a 1cm-thick aluminum spacer block (part of the old SS kit) and then into the bracket, so the bracket was "hanging" from the shift tower base plate.
8. At this point you should be able to lift the tower and shifter free of the shift rod. The end of the shift lever is press-fit inside a rubber bushing that fits inside a cup on the shift rod. You may need to tug a bit, but the bushing should pop out eventually.
9. Take the shift tower to a workbench (or a newspaper-covered kitchen counter for the workbench-challenged among us) to work on it, since its got some small pieces you dont want to lose.
10. Remove and save the two 10mm nuts and lock washers that hold the plate to the top of the shift tower. There are 2 strong springs inside this plate, on the left (1st/2nd gear) side. If you have a vise or large C-clamps, you might want to clamp the plate before you remove the nuts. If not, loosen the nuts first and then maintain pressure on the plate as you remove them by hand. This keeps the assembly from "exploding" - which looks unprofessional, although you wont need to keep the springs anyway so its no great loss if they wander off.
11. Remove the top plate, springs, the rubber buffer pad (shaped the same as the plate & directly beneath it), and the piece the springs run on, and set them aside. The new kit has replacements for all of these.
12. Looking down inside whats left of the shift tower, youll see the pivot cage that attaches the shift lever to the tower. This cage has a pin running laterally (side-to-side) on which the shift lever pivots for fore-and-aft movement (i.e. 1 to 2, 3 to 4), while the cage itself can tilt relative to the tower to give side-to-side lever movement. Remove AND SAVE the two lockrings (C-rings) that hold the lateral axis (side-to-side-running) pivot pin in place, one on either side of the cage. Remove this pivot pin and set it aside. They are quite cheap from Porsche (like maybe a buck) if you do break them, however, there is usually a delay of a couple of weeks as the need is not all that common.
13. Pull the shift lever free of the pivot cage.
14. Remove the pivot cage from the shift tower. On the late-style tower, you unthread the allen bolt that forms the front longitudinal (fore-and-aft running) pivot, then press out the interference-fit piece for the rear pivot. I suspect an early tower would just have the interference-fit pieces on both ends. To press out the pivot, I slid a breaker bar through the pivot cage, placed its flat edge against the pivot, then grabbed both ends and squeezed against the top and bottom ends of the shift tower. This just pushes the pivot back enough that you can get the cage out. On my tower, the interference piece had a spacer washer on it. Save this washer too.
15. Set aside the pivot cage. Keep the allen bolt and/or pivot piece(s) and the washer(s).
16. Clean up the bits youll be reusing: lock rings, cage pivot piece(s), cage pivot washer(s), shift tower, 10mm nuts and lock washers.
17. Cut the bottom end off the bag that the shift levers in. Try to leave this bag over the top end of the shift lever until you have installed it in the tower; this reduces the chances of scratching the paint.
18. Check the fit of the new shift lever in the new pivot cage. I had to bend the cage walls out a bit and file the edges a little to get it to fit. I suspect some drag is OK but you dont want it to bind.
19. Grease the pivot end of the shift lever and the pivot pin, then assemble the lever to the pivot cage and replace the lock rings. With the shift lever positioned so it bends toward you, the pivot pin should extend out of the left side of the cage so it can engage the spring guide plate once the pivot is installed in the tower. A good grease for this is Dow 111 silicone, non staining and wont drip off in hot weather, plus it doesnt smell.
20. Grease the cages fore and aft pivot points (holes) and install the cage and lever into the tower. If you have the late-style tower, replace the allen bolt and lock ring and adjust so the pivot cage has no fore-and-aft play. I didnt tighten my locknut nearly as tight as it was originally; I didnt see the point. Use your best judgement.
For those who do not have the adjustable pivot, it is well worth getting an old housing or even a new one if you can justify the expense. The housing was changed in 1977 so all SCs have it. On adjustment, one trick is to not tighten the lock nut too tightly, but rather leave it snug until you find the right tension for you. BTW, it never has to be too tight, as it doesnt get much stress.
21. Grease and install: new spring plate, new springs, rubber buffer plate, metal top plate, 10mm lock washers and nuts. A vise or an extra set of hands would be helpful in mounting the metal top plate, since you need to compress the springs while lining the plate up to (a) the studs for the 10mm nuts and (b) the two tabs of the metal plate on which the springs run. It can be done solo, but its not particularly fun and youll need to curse a bit.
22. Clean and grease the inside of the shift lever bushing (if youre reusing it; mine was fine) and press it onto the ball end of the shift lever. This is a hard fit. I held the lever vertical and pressed the entire tower assembly down against the table to pop it in.
23. Return the tower to the car. Locate the bracket that holds the bushing in which the front end of the shift rod pivots. Clean and re-grease the shift rod where it runs in this bushing. Position the bracket so its tab (with the threaded holes) sits ABOVE the tunnel. The big, non-threaded hole should line up with the threaded hole in the tunnel (where the big Allen bolt goes). Note that if you are replacing a previous SS kit that used a spacer, this is a new location for this bracket - before it would have been hanging below the level of the tunnel. If not, youre putting it back right where it came from originally.
24. Clean and re-grease the cup at the front of the shift rod that the shifter bushing fits into.
25. Lower the tower into place and fit the shift rod bushing into the cup. This takes some finesse and luck. It seems to work best with the shift rod held vertical. If you have small, long fingers, you can reach in through the access hole in the side of the tower to help fit the bushing into the cup. It should slide easily to the bottom.
26. Line up the holes that mount the shift rod bracket to the plate and reinstall these bolts.
27. Line up the holes that mount the plate to the tunnel and reinstall these bolts. Make sure that you have the shift lever in the cup at this point, I have seen it shift a bit on its own.
28. Reinstall the shift boot and knob, using a new "crush ring" for the knob. I think you want to put the ring all the way inside the knob, then press it onto the lever. I tried putting the ring on the lever and forcing the knob over it, and managed to break the sleeve off of the knob. Good luck on this bit. You can put the shift knob on when this is all on the bench , where you can get at it nicely and not have to worry about damaging your interior.
29. See if you can get into any gears. If you can't, don't despair, we still have to adjust the shift linkage. But, it's helpful to figure out how "close" you are. Return to neutral.
30. The cover for the shift linkage is on the tunnel just forward of the rear "seats." Pull up the carpet, remove 4 screws and take off the cover.
31. There should be a rubber boot covering the shift linkage. On my car, this boot was missing, so I don't know exactly how you pull it back, but I expect it's obvious.
32. Loosen the clamp holding the shift rod to the coupling. I believe these are 13mm nuts. I was able to put a box-end wrench on one and my crappy 3/8" drive socket wrench on the other, and just left the wrenches on while I did the adjustment. One is 12 mm, the other is 13mm.
33. The Haynes manual recommends the following procedure for adjusting the linkage:
34. You may need to fine-tune this adjustment a bit to easily get into all the gears. I had to move the clamp one spline over from this starting point so I could get to 5th and R. Once you can see the coupler move as you move the lever, it should be obvious what you need to do.
35. As a final check, shift into 5th gear and make sure there is some fore-and-aft play in the coupler and linkage. There won't be any play in 1st or 3rd; this is normal.
You must be able to get into reverse without grinding, and when you have selected 5th, you should be able to move the coupler between the rear seats slightly, otherwise things are too tight. Not much, but just a bit of rotational "wiggle" is necessary.
34. Button it up and go for a test drive.
Be prepared to adjust a few times if you are a fussy sort.
Pelican Technical Article:
Installing the 911 Factory Short Shift Kit
5mm & 6mm Allen wrenches, 10mm wrench, 22mm socket, two 13mm wrenches, 12mm wrench, needle-nose pliers, grease (Dow 111 silicone), flathead screwdriver, Phillips head screwdriver, vise, soft faced hammer, piece of wood, workbench
Porsche 911 (1965-89)
Porsche 911 "factory" short shift kit, crush sleeve, bushings (possibly needed), shift knob (possibly)
Faster and more precise shifting
Replace the gear oil in your transmission