6 Speed Two Piece Gear Repair
Greetings, a couple of older threads/posts/pics helped me get 4th gear spinning freely again in my 6 speed trans:
https://www.miataturbo.net/suspensio...7/#post1541632 https://www.miataturbo.net/suspensio...4/#post1459470 In my case it seems that 3rd gear separated enough to keep 4th from spinning freely. Pressed back together to close the gap and all is well. There is a suggestion to tack the two pieces together, though some questions remain for me: Where to tack? See pictures, my thought -- see red asterisk Do you tack a second time, 180* opposite, to "balance" the slight amount of added weight? Do you do both 3rd and 4th because they're of the same two-piece press together nature? This is going in my "rods only" VVT/6258 build. Thanks in advance. https://cimg2.ibsrv.net/gimg/www.mia...037e70d6e5.png https://cimg4.ibsrv.net/gimg/www.mia...ee474bf032.png |
Anyone done this before or was it just in concept?
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Give it a shot and lets us know how it turns out.
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Got dangit bobby
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The asterisk in your picture is on a split shim, you don't want to weld that. The part that can separate in 4th gear is the synchro cone / dog teeth and the helical gear (red line in the picture below)
https://cimg7.ibsrv.net/gimg/www.mia...8c27d739f8.png The newer miata 6 speed comes with welded gear from factory. The top gear in the picture if from an older 6 speed and you can see the the cone / dog teeth is simply pressed on the helical gear. The lower one come from a newer 6 speed and you can see that it has been welded all around https://cimg7.ibsrv.net/gimg/www.mia...ae8d8a0c34.png |
Excellent info, thanks. I didn't know the later trans had the gears welded already -- any idea if the cutoff of the gear revision is the same as when they modified the shifter?
For now, I do have a "late" 6 speed transmission in the car. We haven't done the welding on the "early" transmission yet, but thanks for confirming my picture is wrong. The innards are new to me. |
No idea. I didn't know either until I opened my 6 speed from a 2003 and found that they were welded.
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