Manual 6 SP Hard Shift - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 05-27-2014, 01:21 PM Thread Starter
 
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Manual 6 SP Hard Shift

My transmission has been rebuilt and I also replaced the clutch. I have a B&M short shifter. If I shift as you would in traffic, 1st to second is easy and smooth. 5000 RPMs and up, it gets very hard to pull it into 2nd and shove it into 3rd. Does anyone else experience much harder shifts as the torque increases or do I still have transmission problems? Any input or ideas will be greatly appreciated.

2006, M6, LS2 Bottom, L92 Heads, 236/240 590/590 112 Cam, LS3 Intake, Ported Throttle body, Kooks Long tube, Cat less Flowmaster, Vararam, B&M Short Shifter, Centerforce Clutch, 439 whp/397 trq
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post #2 of 12 (permalink) Old 05-27-2014, 04:31 PM
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Try this. Put your car on a flat surface, put it in first gear and with the clutch depressed rev the engine and see if you can feel the car move a little

2004 Blk/Rd M6
6.3 litre LS1

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post #3 of 12 (permalink) Old 06-03-2014, 12:54 PM
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I'd also re-bleed the slave. Did you install stock-replacement parts or aftermarket? Some require the slave to be shimmed.
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post #4 of 12 (permalink) Old 06-05-2014, 09:05 AM
 
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My transmission has been rebuilt and I also replaced the clutch. I have a B&M short shifter. If I shift as you would in traffic, 1st to second is easy and smooth. 5000 RPMs and up, it gets very hard to pull it into 2nd and shove it into 3rd. Does anyone else experience much harder shifts as the torque increases or do I still have transmission problems? Any input or ideas will be greatly appreciated.
I recently bought a Spec Stage 2 dual disc clutch with a B&M short shifter. It sure isn't a fast shifter, which was what I was hoping for. At high rpms (over 3000) shifting from 1st to 2nd gets me a grinding noise unless I take the time to stop at halfway, then shift all the way into 2nd. Also downshifting to 2nd from 3rd if you're anywhere above 2000 rpm takes a lot of effort. Am waiting for return call from my tuner who installed it to check it out....makes me wish for a paddle shift 6spd auto!$$$$

1-7/8" ARH LTs, 3" Magnaflow exh.,Spec twin disc clutch, 402 stroker , Fast 102 w/Nick Williams TB, 1000 hp shaft & axles, cam, fuel & suspension upgrades. 500 rwhp, 484 rwtq
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post #5 of 12 (permalink) Old 06-05-2014, 02:13 PM Thread Starter
 
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svede1212,
I tested the clutch as you suggested and i don't get any movement. It did move before the clutch replace and transmission rebuild. I am going to take the car back to the shop sometime next week. My question for you or anyone else willing to respond is - Does your transmission shift as easily at 5000 RPM as it does at 2500 RPM? I don't have anything else to compare to.

Thanks

2006, M6, LS2 Bottom, L92 Heads, 236/240 590/590 112 Cam, LS3 Intake, Ported Throttle body, Kooks Long tube, Cat less Flowmaster, Vararam, B&M Short Shifter, Centerforce Clutch, 439 whp/397 trq
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post #6 of 12 (permalink) Old 06-06-2014, 08:16 AM
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I recently bought a Spec Stage 2 dual disc clutch with a B&M short shifter. It sure isn't a fast shifter, which was what I was hoping for. At high rpms (over 3000) shifting from 1st to 2nd gets me a grinding noise unless I take the time to stop at halfway, then shift all the way into 2nd. Also downshifting to 2nd from 3rd if you're anywhere above 2000 rpm takes a lot of effort. Am waiting for return call from my tuner who installed it to check it out....makes me wish for a paddle shift 6spd auto!$$$$
johni53 - the B&M shifter has a reputation - give it a google search. I'd recommend a switch to the GMM or Billet Pro.
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post #7 of 12 (permalink) Old 06-07-2014, 09:24 AM
 
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johni53 - the B&M shifter has a reputation - give it a google search. I'd recommend a switch to the GMM or Billet Pro.
Was wanting the GMM from the start but availability is next to nonexistent. But am so unhappy with this B&M I'm gonna try again with either GMM or Billet Pro. Thanks for the advice, appreciate it.

1-7/8" ARH LTs, 3" Magnaflow exh.,Spec twin disc clutch, 402 stroker , Fast 102 w/Nick Williams TB, 1000 hp shaft & axles, cam, fuel & suspension upgrades. 500 rwhp, 484 rwtq
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post #8 of 12 (permalink) Old 06-08-2014, 01:55 AM
 
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I recently got my transmission back too. It was shifting hard for the first 100 miles but its getting smoother. Now After 500 miles and new oil its way better but still not perfect
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post #9 of 12 (permalink) Old 08-13-2014, 10:01 AM Thread Starter
 
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Manual 6 SP Hard Shift FIXED

After getting some good advice from my tuner, and a lot of researching, I purchased a Tick Performance Adjustable Clutch Master Cylinder Kit. The transmission shop that I had install it kept warning me that they didn't think this would cure my shifting problems. Boy, were they wrong! My car is now a joy to drive. Shifts at high RPM's are smooth as silk. Going into reverse is so easy. If you have shifting issues at higher RPMs like I did, save yourself a lot of pain and get a Tick Master Cylinder Kit.

2006, M6, LS2 Bottom, L92 Heads, 236/240 590/590 112 Cam, LS3 Intake, Ported Throttle body, Kooks Long tube, Cat less Flowmaster, Vararam, B&M Short Shifter, Centerforce Clutch, 439 whp/397 trq
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post #10 of 12 (permalink) Old 08-14-2014, 09:33 AM
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The high RPM causes centrifugal force to overcome the PP springs and make the clutch not completely disengage. A Tick "solves" the problem by increasing the throw of the slave. That can introduce other problems. The pressure plate can be the root cause and often a different clutch setup fixes the problem. What Centerforce do you have? You have a good amount of power and the power to clutch strength usually comes into play.

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