Tranny problem, Help please!! - Ford Powerstroke Diesel Forum
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Old 01-30-2014, 08:07 PM
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Tranny problem, Help please!!

I have a 1996 F250 powerstroke OBS extended cab 5 speed manual, when i start it up to let it warm up or when it is just idling whenever even when warm, the tranny makes a grinding sound. The guy that i bought it from said he had put in south bend dual disc clutches. When i push in the clutch the sound stops, when i let the clutch out it starts back up. Also it grinds going into 3rd gear. And its kind of tough to put it into all other gears, they are suppost to almost just slide into gear arent they?
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Old 01-31-2014, 06:49 AM
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I also have to have the clutch pedal to the floor. if that has anything to do with it too.
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Old 01-31-2014, 09:34 AM
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You have to have the clutch pedal to the floor for what?
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Old 01-31-2014, 10:20 AM
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the grinding is probably the gear roll over noise associated with the single mass flywheel, but with a dual disc i have no idea because i have no experience.

the clutch should disengage about halfway from the floor. you can bleed your clutch if you slave has a bleeder. you can also inspect the lever on the end of the pedals and the rod for the master cylinder for excessive wear.
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Old 02-06-2014, 03:37 AM
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for my clutch to finally engage it has to be to the floor. and ill see if i can bleed my clutch and that might help the pedal problem. but im still not sure what the grinding could be. im sure my synchro for my 3rd gear is bad and thats why it grinds into third. but could that be the grinding noise that i hear?
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Old 02-06-2014, 04:59 AM
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The grinding might well be from the clutch not fully DISengaging. Work on the clutch issue, and the grinding might very well go away.

Bleeding the hydraulics is a PITA. Before opening up the hydraulics, TEST. Measure the movement of the tip of the fork while an assistant works the pedal all the way up and down. If it's at least 1/2"-9/16", the hydraulics and all upstream are good, and the problem is downstream - bent fork, weak pressure plate fingers. If it's less, the problem is upstream, but the hydraulics are only one candidate. Also check the pedal box bushings and the bushing where the pin engages the pushrod eyelet.

Do you find you also have to mash the pedal down hard to the floor in order for the starter to engage to start the motor?
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Old 02-06-2014, 06:34 AM
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I agree with bleeding the system and seeing if that fixes it. I've had that fix alot of random problems with tranny's.
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Old 02-06-2014, 07:29 AM
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Sounds like your throw out bearing is bad if it is grinding while idling. If your clutch does not fully disengage it will make for hard shifts. I would try to adjust the clutch if possible. I'm not to familiar with your set up. I'm just talking from past experience with other vehicles. Does it have a external or internal slave? If it's internal it's possible that they did not bench bleed it before installing it causing air to be caught in the slave.


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