flexpalte cracked
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flexpalte cracked
heres one for ya, i went to start my car a week ago and it started vibrating really bad, and then it practically stalled when i gave it gas. then i went to restart it and it wouldnt start. it was making a horrible grinding noise. i looked under the car and realized that the flexplate was spinning but then engine wasnt turning. i brought it too a tranny shop and they had to take down the tranny i ordered a b+m flexplate and it arrived overnight and they put the part and tranny up the next day i kept the old flexplate so i could hang it on my wall to remind of the real torque monsters these cars are. it cracked in a perfect circle around the bolt holes in the center. hey maybe ill make a clock out of it some day!
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iTrader: (1)
Joined: Apr 2000
Posts: 5,321
Likes: 4
From: Northern CA.
Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
Hope you didn't have an alignment problem which could have caused the flexplate to break like that. The new one would be trash in no time. Post pics if you do make it into a clock
Senior Member
Joined: Jun 2000
Posts: 998
Likes: 0
From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
Had a 3.4 4th gen come into the shop about 2 months ago with the same problem. I also broke one not long after I built the 355 (5 years ago) but I figured that was just from too much power. 
I blew my torque converter about 6 months after that and figured it was a good time to go 6-speed.

I blew my torque converter about 6 months after that and figured it was a good time to go 6-speed.
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Joined: Jan 2001
Posts: 530
Likes: 0
From: Canada
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
flexpplate..
Mine did this as well, a few years back, it is a 92 L98 car , it cracked perfectly around the bolt holes...... The garage said it looked like the trans was misalined or the bolts were over/undertightened i can't recall now as it happened back in 97...later GTA.......
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Joined: Apr 2004
Posts: 584
Likes: 0
From: TEXAS
Car: 88GTAnotchbac/91 -Z/66 Chevelle
Engine: All strokers
Transmission: Pro built 700r4's
flex plate cracked
3 things put your flex plate in danger.
Increased power
higher stall converter
spinning your motor to 6000 grand +
and the stock ones are just thin pieces of junk.
Good thing I can count
If you replace it make sure its an SFI approved they are twice as thick and substantially stronger.
Once it gets cracked from one whole to the next, its just a chain reaction due to the fact under a load the plate is (flexed )and it only gets worse. nice little 3 or 4 hour job.
Increased power
higher stall converter
spinning your motor to 6000 grand +
and the stock ones are just thin pieces of junk.
Good thing I can count
If you replace it make sure its an SFI approved they are twice as thick and substantially stronger.
Once it gets cracked from one whole to the next, its just a chain reaction due to the fact under a load the plate is (flexed )and it only gets worse. nice little 3 or 4 hour job.
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
"Torque monsters" and "too much power" 
The most famous of all "torque monsters" in my experience for doing that are Chrysler K-cars.... my TV station had 2 news cars that broke them out of about 7 or 8 that we had, I guess it was all that awesome K-car power.

The most famous of all "torque monsters" in my experience for doing that are Chrysler K-cars.... my TV station had 2 news cars that broke them out of about 7 or 8 that we had, I guess it was all that awesome K-car power.
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