454 to 700r4 flywheel/flexplate - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Jun 20th, 09, 6:25 PM
morecubes! morecubes! is offline
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Default 454 to 700r4 flywheel/flexplate

im trying to swap a 454 and 700r4 into my buddie's 71 malibu but running into some problems. it's a 70's 454 casting number 3999289 being hooked up to a rebuilt 700r4. what flywheel do i use?


i have one from kragen, pioneer part number FRA-141. this will bolt up to the crank flange but the torque converter holes do not line up

also have another from a sb that matches the converter pattern but wont fit onto the crank flange (center hole too small)

for those of you who've done this, what flywheel/flexplate do i use?

help please, im ready to light this thing on fire
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  #2  
Old Jun 20th, 09, 6:47 PM
Mike Mike is offline
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Default Re: 454 to 700r4 flywheel/flexplate

454 flexplate with dual bolt pattern.
TCI 399473 would work.
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  #3  
Old Jun 20th, 09, 7:53 PM
morecubes! morecubes! is offline
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Default Re: 454 to 700r4 flywheel/flexplate

wish i knew what the 'dual' pattern was. the bolt pattern/spacing on my converter is 9 1/4". on the BB flexplate there are two patterns, and the smaller of the two is 9 7/8" ...im tempted to elongate the holes but fear that will cause some terrible vibrations.
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  #4  
Old Jun 20th, 09, 10:37 PM
AXEMAN39 AXEMAN39 is offline
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Default Re: 454 to 700r4 flywheel/flexplate

I just ran into this same problem, I found that if I went to the local car quest auto parts and told them I needed a flex plate for a mid 80s Chevy pick up with a 454 I would get the flex plate with the large converter bolt pattern only but, if I told them I had a 1972 Chevelle with a 454 I got a different flex plate with both large and small converter patterns. Hope this helps sorry I dont have the part# I threw out the recipt so the old lady would'nt find it.
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69 elCamino 454 10.5 compression
Comp hyd roller 232@050 578 lift 106 lc
Edelbrock aluminum heads, 2.25 & 1.89 valves, BG 850 double pumper, Air gap intake, Jeep steering box, hydroboost, 4 wheel disc brakes
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Old Jun 20th, 09, 11:01 PM
morecubes! morecubes! is offline
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Default Re: 454 to 700r4 flywheel/flexplate

do you recall the distance on the 'small' pattern? 72 chevelle w/ a 454 huh? might have to give that a shot
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  #6  
Old Jun 21st, 09, 12:10 AM
Robinls5 Robinls5 is offline
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Default Re: 454 to 700r4 flywheel/flexplate

When I did my swap. I got a NHRA approved flex plate from Summit. It is a dual pattern cost around $ 69.00.
Bob
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  #7  
Old Jun 21st, 09, 1:24 PM
morecubes! morecubes! is offline
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Default Re: 454 to 700r4 flywheel/flexplate

hopefully picking up the right flywheel this afternoon, i'll report back
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  #8  
Old Jun 21st, 09, 2:46 PM
AXEMAN39 AXEMAN39 is offline
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Default Re: 454 to 700r4 flywheel/flexplate

Center of one hole to the center of the next is 9 & 1/4 inches
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69 elCamino 454 10.5 compression
Comp hyd roller 232@050 578 lift 106 lc
Edelbrock aluminum heads, 2.25 & 1.89 valves, BG 850 double pumper, Air gap intake, Jeep steering box, hydroboost, 4 wheel disc brakes
M21 4 speed, 12 bolt, Yukon Duragrip posi, 3.73 gears
http://i194.photobucket.com/albums/z...g?t=1277519962
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  #9  
Old Jun 21st, 09, 4:58 PM
Racing Racing is offline
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Default Re: 454 to 700r4 flywheel/flexplate

Quote:
Originally Posted by morecubes! View Post
wish i knew what the 'dual' pattern was. the bolt pattern/spacing on my converter is 9 1/4". on the BB flexplate there are two patterns, and the smaller of the two is 9 7/8" ...im tempted to elongate the holes but fear that will cause some terrible vibrations.
The bolts aren't what center the torque converter. The converter centers off of the crankshaft.

Look at the elongated holes on these flexplates.






You can transfer hole location from one flexplate to another by laying one over the top of the other or with the flexplate attached to the engine hold up the converter up to the flexplate and transfer the hole location from the torque converter to the flexplate.

Note: There are 6 raised mounting pads. Only three are needed. Rotate the plate 1/6th of a turn and drill on the blank pads.
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  #10  
Old Jun 21st, 09, 7:58 PM
morecubes! morecubes! is offline
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Default Re: 454 to 700r4 flywheel/flexplate

i was more concerned w/ vibrations from being out of balance if i elongated the holes. im aware the tc is centered off the crankshaft. good news, i found one that works. Pioneer part #FRA-111

bolting it up as we speak
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