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Flexplate- is this a problem??

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Old Aug 4, 2001 | 11:48 AM
  #1  
Damon's Avatar
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From: Philly, PA
Flexplate- is this a problem??

Just bolted a 1975-vintage 400 in my brother's 87 GTA originally equipped with the L-98 350 and 700R4 auto-box.

Car still has the original torque converter in the trans. My original 1975 400 flexplate bolts right up since it's drilled for both the large and small pattern torque converter (the 700R4 converter usues the small bolt pattern). All is going well UNTIL.......

I go to tighten down the flexplate-to-torque converter bolts. They go in just fine but the torque converter and the flexplate have about 1/4" of space between them. naturally, as I tighten them down the torque converter pops forward that 1/4 inch. YES, I have the flexplate on the right way around.

Is this going to be a problem? How far forward can the converter go before it disengages from the front pump and/or loses it's seal to the rest of the trans?

All other swaps I have done the convter and the flexplate are just about touching eachother even before the bolts go in. The L-98's once piece-style rear seal crank must put the flexplate just a smidge further back than an older style Small Block is my guess.

Problem???


[This message has been edited by Damon (edited August 04, 2001).]

[This message has been edited by Damon (edited August 04, 2001).]
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Old Aug 5, 2001 | 11:21 AM
  #2  
james_fearn's Avatar
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From: SoCal
wrong post

[This message has been edited by james_fearn (edited August 05, 2001).]
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Old Aug 9, 2001 | 11:50 AM
  #3  
82suped-up-coupe's Avatar
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From: langley, bc, canada
new to me
I'd definately find out for sure before I buttoned it up though
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Old Aug 9, 2001 | 06:23 PM
  #4  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I'd suggest giving Dana at Probuilt a call.
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Old Aug 10, 2001 | 02:18 AM
  #5  
JoelOl75's Avatar
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Joined: Jan 2001
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
I usually see 3/16" of gap to close. I'm not sure what the max is.
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Old Aug 13, 2001 | 07:58 PM
  #6  
406TPI's Avatar
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From: Grand Rapids, MI
Car: 1985 IROC-Z
Engine: Magnacharged LS1
Transmission: T56
Axle/Gears: Ford 9" 4:11's
.250 is fine for a gap...not a problem!
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