Clutch Not Fully Disengaging

Wissam Hatim

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Hey there,

I drive a 2012 Mustang GT with a Magnum XL and a McLeod RXT Twin Plate Clutch. I have been having transmission issues for a while, had some bad synchros so finally pulled the trigger and completely rebuilt the transmission from the ground up. Yesterday I reinstalled the transmission with you a new slave cylinder and also a new master cylinder. Upon driving it on my first WOT pull I felt a little nibble on the shift. Started to feel my clutch is not fully disengaging. I pulled over to the side of the road, put in in first gear and with the clutch in I revved the car. At about 6000 RPM the car starts to very slowly creep forward, so it seems that yes, the clutch is not fully disengaging at high RPMs. What do you think could be the problem? When I removed the transmission I also removed and inspected the clutch, clutch plates looked good and had good material on them. Good the problem be caused by a worn out pressure plate or just a hydraulic system that needs more time to bleed? I'm worried it is the fact the clutch doesn't correctly disengage that I ruined my synchros before the rebuild.
 

Mojo88

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I have same tranny and clutch in 2010 GT. It is a 'notchy' bitch until warm. Plus, when I do WOT pull I always let off the throttle for a microsecond between shifts.

I don't like that method you used of 6000 rpm test. I think the best way to tell if clutch is releasing is by where it grabs when you push the pedal in and out. If it grabs right at floor then perhaps not releasing. If it grabs about an inch off the floor, then all is good.

Anyway, that's just my opinion.
 

Wissam Hatim

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Thanks for your input, all the notchiness is alright, had the transmission for a couple years. The test of the car rolling forward at 6000rpm, I believe, is good way of showing that my clutch is not disengaging. The more I read online the more it seems that I may need to work on better bleeding the system.
 

Mojo88

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I haven't had to bleed mine (yet). This guy is bleeding 2012 and says you need to do it multiple times with vacuum style pump.
 

03Sssnake

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I haven't had to bleed mine (yet). This guy is bleeding 2012 and says you need to do it multiple times with vacuum style pump.

did this on my GM stuff till I put the bleeder line on my slave cylinders and did a Tick MC...too bad we don't have that option on Ford slaves, or a better MC etc...
 

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