Bad flexplate and or TC. About to order parts.. - Ford Powerstroke Diesel Forum
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Old 03-29-2014, 03:38 PM
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Bad flexplate and or TC. About to order parts..

My flexplate has a wobble to it and rattles. The truck has a shudder at idle but goes away in high rpms. Also my boost falls off bad between wot shifts. 1/2 throttle shifts it stays right up there. I kno my flexplate is most likely cracked and I probably need a new TC. The truck does not seem to put the power to the ground without running over 2200 rpms.

It has recently gotten worse due to the dp tuner and newish gt38r

My fluid is clean so I planned on buying the following because I can't afford a bts at the moment.

Racerx triple billet converter (I don't have 1400$ for a PI and it seem like a waste to put one on a stock tranny anyway)
JW valve body
New factory flexplate

Is there some other options I would be better off doing?

Truck already has a ford reman tranny In it but I don't know if it was installed correctly. Truck is a 2001 7.3 btw.

Thanks for any advice
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Old 03-31-2014, 06:22 AM
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id get the flexplate. Install it, then move on to the next issue. Build up a boost leak detector and go fromthere. Any signs of soot anywhere...firewall, turbo collector..etc, gotta leak. If still rock'n the stock cac boots, nows a good time to replace with riffraff boots
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Old 03-31-2014, 09:33 AM
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Anytime you have an existing problem like your flexplate, and you add more power, that problem is going to be aggravated and exaggerated. timmyboy has you headed in the right direction. Get your flexplate taken care of and go from there. Compounding issues tend to mask one another. Fix them one at a time and go from there.
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Old 03-31-2014, 09:47 AM
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I replaced the cac boots with ones from riffraff when I installed the new 38r. Don't get me wrong it will get to 27-32 depending on the tune it just falls off between wot shifts.

I am going with what you said Timmyboy I bought a flexpate today and have an appt at the shop for later this week. I wish I was home and had the time so I didn't have to pay someone to do this for me.

Hopefully this will solve my issue and they don't find and other goodies to fix.
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Old 03-31-2014, 09:51 AM
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Forgot to add that my ATF Is clean and the tranny has never seen more than 165 degrees, usually stays between 120-130 here in NC. I'm really hoping it's just the plate becUse I really can't afford anything more right now lol.

I'll kno by Thursday.
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Old 04-03-2014, 09:20 PM
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New flexplate installed and the shudder is gone. However I am still getting a rattle this has to be the torque converter right?

I replaced the starter today and that fixed my grinding issues and the truck starts super quick now.

It runs much smoother but like I said still rattles at low rpm and when cruising slow. Should I not even worry about this until something major starts happening? I'm just bummed I've put so much into this truck lately to have her still rattle as I drive around.
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Old 04-03-2014, 09:33 PM
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glad to hear the shudders'gone. With a rattle at low speed..etc, and with a 38r installed, check the DP and the rest of the exhaust. Make sure its not hitting anything. Found my buddys DP hitn the ground strap bolt thats on back of motor, in the "chamber"where DP rest.
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