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Old 05-16-2011, 01:26 PM
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Need Flexplate Help Please

Hey guys ive got a problem that I cant figure out.
Heres the car info:
59 chevy 1/2 ton truck
1980 chevy 454 motor
80s 700r4 trans (non computer controlled)

When I put the trans in I drove it for about 7 or 8 months and then the flexplate started to very lightly tap on the starter housing area making some noise, while the motor was running I looked under there and it appeared to be warped. I took that flexplate back to the store and bought the heavy duty version. Put that one on and its been perfect for the last 6 months. Now same thing, appears to be wobbling just a tiny bit (probably not anything abnormal though) but it still taps on that starter area making noise, the noise is almost like what a worn out water pump bearing makes but its from the flexplate tapping.

My question is should this be something that can be corrected by somehow moving the starter a couple millimeters or tweaking the flexplate with a prybar or what should be done?

Thanks everyone!

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Old 05-16-2011, 01:52 PM
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I've never heard of this happening, can't think of a reason why the flywheel is warping like that. I do know that you do not want to take a pry bar to it. The flywheel being bolted to the crankshaft, prying just does not sound like a good idea. Another thing I know is that you can shim your starter to gain the clearance you need.
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Old 05-16-2011, 02:21 PM
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I dont think shimming the starter would fix my problem. From me experience you need to shim the starter to make the teeth engage properly between the starter and the flexplate. they are engaging properly when starting the truck but the wobble back and forth on the flexplate is making it tap the housing. Not scrape constantly just the warped part goes tap tap tap tap tap while the engine is running.
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Old 05-16-2011, 02:27 PM
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flexplate

Are you sure it is seated correctly on crankshaft? Is it cracked around center hole. Are correct bolts torqued down good?
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Old 05-16-2011, 02:33 PM
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I torqued them to spec on the motor side with GM bolts and torqued the converter to the flexplate to spec with GM bolts. No cracks seen.
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Old 05-16-2011, 04:29 PM
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alright upon further inspection the flexplate isint hitting anything. I thought it was hitting the side of the starter but that wasnt the case...sorry for the wrong info....when I start the truck while underneath it I hear it coming mostly from the torque converter....when I shut off the motor I hear something settling around the inside of the torque converter I think. To me is sounds as if there is a piece of metal or something inside the torque converter rattling around. Any ideas?
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Old 05-16-2011, 04:35 PM
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Sounds like the converter is coming apart if so don't drive it JMO. That thing will lock up tighter then dicks old hat band.


Cole
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Old 05-16-2011, 04:54 PM
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I should add that at higher RPM's its more of a chatter noise...just to be safe theres a trans shop directly across the street from me that said they would throw it on the lift and check it out. Ill let you guys know what they say.
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Old 05-22-2011, 01:01 PM
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ok guys the trans shop is completely useless and said "if it sounds like the torque converter its going to have to be pulled out anyway to find out and told me just for them to find out the problem it would be $500+....so forget that Im going to replace the converter but I need some help on which one.

Please remember I have a 454 engine and the 700r4 trans. Which stall speed should I get?
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Old 05-22-2011, 03:21 PM
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What is the Truck used for?
What size Cam? Duration @.050" lift?
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Old 05-22-2011, 04:31 PM
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The truck is a daily driver but at the same time if i floor it once or twice a year I don't want to destroy the torque converter. I don't know internal motor specs. All the builder told me was forged intervals and was considered high output approximately 450hp but nothing insane done inside. Please advise which stall I should use. Thanks
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Old 05-22-2011, 09:46 PM
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Difficult to recommend a stall rating with no Info.
Does the Engine sound pretty much stock, Cam wise?
Where/what rpm does it start making power?

You could install a HD towing type converter or mild performance 2000-2500rpm stall.
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Old 05-22-2011, 10:00 PM
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It does sound pretty much stock to me, do any cars come stock with an HD converter that I can use?
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Old 05-22-2011, 10:15 PM
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Quote:
Originally Posted by chevyrestore
It does sound pretty much stock to me, do any cars come stock with an HD converter that I can use?
Nope is the official answer on this question, i know converters are expensi e but sometimes you have to bite the bullet. It is not safe nore is it recommended to reuse a torque converter from another vehicle without having it rebuilt which is just as costly as a new one, from the sounds of things a 2500-3000 stall would suit you well get a HD. If you will be doing any sort of towing. Not trying to be a ball buster just hate hearing about a fellow gear head breaking down over a cheap fix instead of doing the job rite, my motto is spend the cash once and spend it right, good luck bud
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Old 05-22-2011, 10:18 PM
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the truck will not be doing any towing. It is mainly a daily driver with the occasional lead foot put to it for 5 or 10 seconds just a few times a year. That being said should I really go 2500-3000? I did find a 2500 stall on craigslist new/rebuilt that I can pick up but we dont know if its HD or not
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