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Old 09-23-2017, 07:04 PM   #1
LS1ow
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Flexplate/Crank Mismatch

This is like Deja vu all over again

Today was supposed to be the day things got moving, but then when trying to install the flexplate on my motor i realized today was the day of confusion and stress.

As you can see in the pic, the flexplate i got does not match up with the bolt pattern of the crank.



Assuming the empty hole matches up with the dowel on the crank, i have flipped the flexplate both ways, and they still dont match up. Not the flipped it would change the bolt pattern but whatever.

Thinking maybe i just got a miss pick plate, i headed to a different parts store and grabbed one. Same exact issue. What really are the chances that 2 flex plates, from 2 different places, are both miss picked?

The block it self is 100% a gen 3 due to the cam sensor being located at the rear top of the block, along with the marking 12560625 on the block itself at the rear driver side should render it a 5.7.

Anyone ever run into anything like this? in my previous car i had to run a silverado SS flexplate due to the spacing, but im 98% the bolt pattern between the 6.0 and the ls1 flexplate were identical.
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Old 09-23-2017, 10:31 PM   #2
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I haven't found much but this should not be a problem. Either you had double the bad luck or you have mystery crank.....



Grab your calipers/kirk and measure the bolt circle diameter. Should be 3.11" center to center. Check the flexplate and check the crank best you can. Let me know what you come up with.
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Old 09-23-2017, 11:08 PM   #3
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Could be a bad run, and both brands use the same manufacture. I had a flywheel like this back when I built my 86.
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Old 09-24-2017, 01:21 AM   #4
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Below is what I got back from running the VIN before i purcgased in 2008/2009... No mention of crank and I didn't touch it during my tenure either

Quote:
2000 FIREBIRD TRANS AM

APPLICABLE WARRANTIES
Description Effective Date Effective Odometer End Date End Odometer
36/36000 BUMPER TO BUMPER LIMITED WARRANTY 02/05/2000 50 miles 02/05/2003 36050 miles
72/100000 SHEET METAL COVERAGE RUST THROUGH LIMITED WARRANTY 02/05/2000 50 miles 02/05/2006 100050 miles
96/80000 FEDERAL EMISSION CATALYTIC CONV. AND PCM 02/05/2000 50 miles 02/05/2008 80050 miles
36/50000 CALIFORNIA EMISSIONS 02/05/2000 50 miles 02/05/2003 50050 miles
84/70000 CALIFORNIA SELECT COMPONENT 02/05/2000 50 miles 02/05/2007 70050 miles

CLAIM HISTORY
R.O Date R.O Number Type Labor Operation Odometer Reading
05/30/2007 173233 # L2300 - CONVERTER, OXIDATION CATALYTIC - REPLACE 79700 miles
01/25/2007 169630 B F2283 - BEARING, PINION (FRONT AND/OR REAR) - REAR DIFFERENTIAL - 76234 miles
02/28/2006 159665 # L2300 - CONVERTER, OXIDATION CATALYTIC - REPLACE 67201 miles
07/25/2002 115789 # F1530 - SHAFT, AXLE - REAR AXLE - RIGHT - REPLACE 27002 miles
07/25/2002 115789 # F1650 - BEARING, AXLE SHAFT - REAR AXLE - RIGHT - REPLACE 27002 miles
07/19/2002 115548 # N3315 - FRONT SIDE DOOR WINDOW REGULATOR MOTOR REPLACEMENT - LEFT 26111 miles
03/05/2002 110886 # K6500 - PAN AND/OR GASKET, TRANSMISSION OIL- REPLACE 21201 miles
11/06/2001 106718 # R0951 - RADIO REAR SIDE DOOR SPEAKER REPLACEMENT - LEFT SIDE 17960 miles
07/18/2001 102833 # K6500 - PAN AND/OR GASKET, TRANSMISSION OIL- REPLACE 13921 miles
12/05/2000 094870 # N0363 - MODULE, DAYTIME RUNNING LIGHT - REPLACE 6853 miles
09/29/2000 092405 # K6560 - VALVE BODY, TRANSMISSION - R&R OR REPLACE 4921 miles
09/29/2000 092405 # Z7903 - 3-DAY COURTESY TRANSPORTATION 4921 miles
09/29/2000 092405 # T5999 - ADDITIONAL PART MARKUP PERCENTAGE OVER 40% NORM 4921 miles
09/25/2000 092195 # K6556 - WIRING HARNESS AND/OR SOLENOID - 2-3 SHIFT SOLENOID - REPL 4895 miles
09/25/2000 092195 # Z7903 - 3-DAY COURTESY TRANSPORTATION 4895 miles
09/25/2000 092195 # T5999 - ADDITIONAL PART MARKUP PERCENTAGE OVER 40% NORM 4895 miles
06/28/2000 088877 # C7250 - REAR SEAT CUSHION COVER REPLACEMENT 2913 miles
06/28/2000 088877 # R0420 - MAST, POWER ANTENNA- REPLACE 2913 miles
06/28/2000 088877 # C7251 - COVER AND/OR PAD, REAR OR ROW 1 SEAT CUSHION - LEFT - R&R 2913 miles
06/28/2000 088877 # Z5000 - DEALER/RETAILER TRADE(PART OBTAINED LOCALLY) 2913 miles
06/28/2000 088877 # T5999 - ADDITIONAL PART MARKUP PERCENTAGE OVER 40% NORM 2913 miles
05/31/2000 087763 # T5999 - ADDITIONAL PART MARKUP PERCENTAGE OVER 40% NORM 2563 miles
05/31/2000 087763 # C8540 - PANEL, LUGGAGE COMPARTMENT REAR - R&R OR REPLACE 2563 miles
05/31/2000 087763 # Z7901 - 1-DAY COURTESY TRANSPORTATION 2563 miles
02/04/2000 083384 # N0250 - RT COMPO HDLAMP RPL 11 miles
02/04/2000 083384 # T5999 - ADDITIONAL PART MARKUP PERCENTAGE OVER 40% NORM 11 miles
01/12/2000 238433 I Z7000 - PRE-DELIVERY INSPECTION - BASE TIME 0 miles

OPTION CODES
192 - TRIM, EBONY
19I - INT TRIM, EBONY
1AY - ORDER MODIFICATION STOCK
1SA - OPTION GROUP - 1SA
41U - PAINT, BLACK
6ZM - COMPONENT FRT LH COMPUT SEL SUS
7ZM - COMPONENT FRT RH COMPUT SEL SUS
8TJ - COMPONENT RR LH COMPUT SEL SUSP
9TJ - COMPONENT RR RH COMPUT SEL SUSP
A31 - POWER WINDOWS
AAA - STANDARD EQUIPMENT PROCESSING OPTION
AG1 - POWER SEAT, DRIVER 6-WAY
AK5 - DUAL FRONTAL AIR BAGS
AQ9 - CUSTOM BUCKET STS
AU0 - REMOTE KEYLESS ENTRY
AU3 - POWER DOOR LOCKS
C60 - AIR CONDITIONING, CUSTOM
CC1
DE4
DG7 - DUAL REMOTE CONTROL MIRRORS
DL5 - DECAL ROADSIDE SERVICE
FE2 - SUSPENSION SYSTEM, HANDLING
G80 - LIMITED SLIP TORSEN REAR DIFFERENTIAL
GU2 - AXLE RATIO 2.73
IL2 - TRIM INTERIOR DESIGN
J65 - BRAKES, PWR 4-WHL,DISC FRT & RR
K43 - 102 AMP GENERATOR
LS1
M30 - AUTOMATIC TRANSMISSION
MX0 - TRANSMISSION, 4-SPEED AUTOMATIC
NC1 - CALIFORNIA EMISSIONS LEV
NG1 - NORTHEAST EMISSIONS
NP5 - STEERING WHEEL, LEATHER WRAPPED WITH RADIO CONTROLS
NW9 - TRACTION CONTROL, ELECTRONIC
P05 - 16" CHROME WHEELS
QFZ - TIRES, P245/50ZR16
R6M
R7X - REMOTE KEYLESS ENTRY/CONTENT THEFT
R9P - POWER PACKAGE INCLUDES: POWER DOOR LOCKS RETAINED ACCESSORY POWER, POWER WINDOWS INCLUDING EXPRESS DOWN DRIVER'S SIDE DUAL POWER SPORT MIRRORS POWER ANTENNA
STE - ASM PLT ST. THERESE
T43 - SPOILER, REAR DECK LID
T78
U1S - REMOTE COMPACT DISC CHANGER, TRUNK MOUNTED, 12 DISC CAPACITY
U75 - POWER ANTENNA
UA6 - THEFT DETERRENT SYSTEM
UB3 - RALLY GAGES W/TACHOMETER
UK3 - STEERING WHEEL, LEATHER WRAPPED W/ RADIO CONTROLS
V12
V73 - VEHICLE CERTIFICATION U.S.
VM3 - BUMPER STD IMPACT 5 MPH FRT &RR
W54
WS9
Y82
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Old 09-24-2017, 06:59 PM   #5
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No solid info yet due to not having a caliper, going to have to borrow my techs again.

But I have read after digging threw google that Napa/autozone/Orielly list the correct part number as "FRA159" for 98-02 60e LS fbodys, but that is an error and should list "FRA471" as the correct one. So hopefully that is it.
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Old 09-25-2017, 11:07 AM   #6
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Looks like i got 2 fubared flexplates
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Old 09-25-2017, 11:22 AM   #7
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Time to play the lotto
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Old 09-25-2017, 11:42 AM   #8
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Since there is 6 bolts they should be equally spaced, no?

Heres what i found.

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Old 09-25-2017, 12:30 PM   #9
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No, measure across bolt center to bolt center.
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Old 09-25-2017, 12:37 PM   #10
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No, measure across bolt center to bolt center.
While that is correct, this still gets the point across that the plate is FUBAR'ed
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Old 09-25-2017, 12:40 PM   #11
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Quote:
Originally Posted by sweetbmxrider View Post
No, measure across bolt center to bolt center.
Each hole is .466 Diameter, inside edge to inside edge of hole is 2.549.

by my most likely wrong calculation, that puts it at 3.015" center to center.

Even still being pretty close to what you posted, if the holes are spaced out correctly, but are "warped" or twisted out of skew like i think i mine are, i will have the problem im having.
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Old 09-25-2017, 01:01 PM   #12
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Here is the second flexplate



Hole Diameter: .466
Inside Edge to Inside Edge: 2.538
center to center: 3.004
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Old 09-25-2017, 02:28 PM   #13
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Who makes the flexplate? For reference, when ordering end links for my parents yukon denali, rockauto sent me outer tie rods for an entirely different car despite the acdelco box stating the correct part number and pic on rockauto showing exactly what I needed. When I sent it back, they sent the same thing again. Turns out acdelco misboxe that part number. I bought stuff at AAP so I could verify the right part. It's possible you could have the same issue and both rockauto and NAPA got misboxed parts.
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Old 09-25-2017, 03:17 PM   #14
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Didnt snag a real pic, but stopped home at lunch and measured the space between the bolts on the crank.

An equal 1.200" between each. Perfectly symetrical.

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Old 09-25-2017, 03:19 PM   #15
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Who makes the flexplate? For reference, when ordering end links for my parents yukon denali, rockauto sent me outer tie rods for an entirely different car despite the acdelco box stating the correct part number and pic on rockauto showing exactly what I needed. When I sent it back, they sent the same thing again. Turns out acdelco misboxe that part number. I bought stuff at AAP so I could verify the right part. It's possible you could have the same issue and both rockauto and NAPA got misboxed parts.
Pioneer is the manufacture of the plate, and i think they supply to both napa and autozone, which is were i got the plates
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Old 09-25-2017, 04:20 PM   #16
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I guess its time to get one from TCI
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and once i get PHB, what do i ajust it too?
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Old 09-25-2017, 04:27 PM   #17
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I guess its time to get one from TCI
Currently waiting on a replacement one from napa. I deal with the local napa a lot since we buy a lot of parts for the used cars we get traded in threw them, so i like to give em a chance to fix it. If the one i get is wrong again, a TCI one will be ordered
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Old 09-25-2017, 04:56 PM   #18
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so no fancy SFI-rated part?
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Old 09-25-2017, 05:00 PM   #19
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so no fancy SFI-rated part?
not yet, hopefully.


Hoping the Napa one shows up and is good to go. Save me some money and down time. Im itching to get this thing in.
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Old 09-25-2017, 09:48 PM   #20
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hi there, i just joined this forum and i must admit that i like it
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I know it's good to eat salads, but this is ridiculous.
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Old 09-25-2017, 10:03 PM   #21
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What!
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Old 09-25-2017, 11:08 PM   #22
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No solid info yet due to not having a caliper, going to have to borrow my techs again.

But I have read after digging threw google that Napa/autozone/Orielly list the correct part number as "FRA159" for 98-02 60e LS fbodys, but that is an error and should list "FRA471" as the correct one. So hopefully that is it.
Rockauto lists both numbers for the flexplate.
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Old 09-26-2017, 08:52 AM   #23
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For some reason, I thought the holes were supposed to have random offsets like you are seeing. That thing is fuuuuuuucked
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I know it's good to eat salads, but this is ridiculous.
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Old 09-26-2017, 09:53 AM   #24
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Nah son, random holes would make that thing less balanced than kohlers body after his juice cycles.
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Old 09-26-2017, 11:19 AM   #25
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and once i get PHB, what do i ajust it too?
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Seven.
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