Muncie popping out of 3rd gear at 6100 rpm...650 wtq
I have an M23 I bought new a few years back. I don't have many miles on it and it never did this before in another setup so its something I have setup wrong I suspect.
Details on setup
3400 lb race weight car
LS3 turbo about 650 wtq 12psi
M23W 1.48 3rd gear
Center force DFX 6 puck ceramic single disk clutch
3.08 rear gear and 28" MT Pros
New Hurst shifter
When I first got the trans new, I had 3rd gear limiter on the shifter way too far out and ground 3rd gear a few times pretty bad, not sure how I was that inept looking back at it. Maybe I tore up 3rd gear a little doing that, I cant imagine though, it was only a few times. I adjusted the limiter out a turn and a half, it doesn't grind, but still pops out, I'll try adjusting it further but I have to be close to making it grind again.
My other theories are I need offset dowels in the block, I never measured concentricity...would that do this? It doesn't pop out in 1st or 2nd, but its never hooking in those gears at all under load so not a good comparison.
The pucks on the clutch look a little crappy, slightly pitted, the ceramic disk does not like 3.08 gears and 28" tires, I have to slip it more than a ceramic disk should be slipped just driving around. Could the clutch make it pop out? It is holding the power fine, I can do a pull in 4th gear to 145mph and it never slips, but thats only to 5200 rpm or so.
So my theories, what do you think:
1. Third gear limiter on the shifter still too limiting
2. Tore up a gear or synchro by grinding 3rd gear a few times
3. Concentricity is off <--- I feel like this might be it but then again I keep reading that will tear up trans bearings more than anything
4. Clutch somehow
Thanks for any insight! I have a dyno appt on Friday so I am desperately trying to figure it out, I want to dyno in 3rd to 7200 rpm, 4th would put me over 200mph so thats not great.
64 Chevy II, L92 6.0, 57mm S200s, AWD with Syclone/Astro transfer case
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63 Impala, 454ho short block, 265 afr heads, 60mm S300s
62 Biscayne LS3 turbo, M23