Why doesn't my flex plate fit?
+2
bigredlaguna
1973 454 MONTE
6 posters
G3GM :: G3 Tech :: Engine & Driveline
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Why doesn't my flex plate fit?
Ok,day was going well,started at 3:00 am,and was installing my 2002 5.7 motor and trans.
I thought I was pretty much done,but no.
The flex plate from the 2002 motor doesn't line up with my earlier turbo 350 torque converter.
I have another available,external balance from a 91 5.7.
When did they change the bolt pattern on the flex plate?
I was under the impression all external balance flex plates had the same bolt pattern.
I've never read or heard of anyone not being able to bolt on their torque converter.
Any help appreciated.
Thanks.
I thought I was pretty much done,but no.
The flex plate from the 2002 motor doesn't line up with my earlier turbo 350 torque converter.
I have another available,external balance from a 91 5.7.
When did they change the bolt pattern on the flex plate?
I was under the impression all external balance flex plates had the same bolt pattern.
I've never read or heard of anyone not being able to bolt on their torque converter.
Any help appreciated.
Thanks.
Sinister- G3GM Member
- Street Cred : 0
Re: Why doesn't my flex plate fit?
i always thought they had 2 different patterns. as if to say the F-P has 6 T-C holes
1973 454 MONTE- Donating Member
- Street Cred : 36
Re: Why doesn't my flex plate fit?
Found this info on a retrofit site.
"Transmission Retrofits
Installing a LS1 engine with another transmission such as a early 200/700R4, THM350/400 will require the installation of flywheel GM part number 12551367.
If using the F-body and C/K trucks with the 300 mm bolt pattern will require the flexplate with PN 12563136.
The 4L80E or 6 lug converters will require PN 12551367. This flexplate is flat and will require the use of a spacer (PN 12563532) and bolts (PN 125635330 which is included with flexplate assembly.
If using a early manual transmission will require, which will use a 11.7" (298mm) clutches:
PN 12562765: 6 speed flywheel assembly
PN 12561680 Early style 4 speed flywheel
The LS1 crankshaft is also shorter relative to the bell housing than the earlier small-blocks. Special pilot bearing PN 12557583 is needed to compensate for this difference."
"Transmission Retrofits
Installing a LS1 engine with another transmission such as a early 200/700R4, THM350/400 will require the installation of flywheel GM part number 12551367.
If using the F-body and C/K trucks with the 300 mm bolt pattern will require the flexplate with PN 12563136.
The 4L80E or 6 lug converters will require PN 12551367. This flexplate is flat and will require the use of a spacer (PN 12563532) and bolts (PN 125635330 which is included with flexplate assembly.
If using a early manual transmission will require, which will use a 11.7" (298mm) clutches:
PN 12562765: 6 speed flywheel assembly
PN 12561680 Early style 4 speed flywheel
The LS1 crankshaft is also shorter relative to the bell housing than the earlier small-blocks. Special pilot bearing PN 12557583 is needed to compensate for this difference."
bigredlaguna- G3GM Senior Member
- Street Cred : 53
Re: Why doesn't my flex plate fit?
Unless you have the last year of the gen I vortech engine, then my previous post doesn't apply.
My 1992 305 matches with the TH350 torque converter. Just had to use the 1992 starter because of the small diameter of the flexplate.
My 1992 305 matches with the TH350 torque converter. Just had to use the 1992 starter because of the small diameter of the flexplate.
bigredlaguna- G3GM Senior Member
- Street Cred : 53
Re: Why doesn't my flex plate fit?
If the motor is an '02, that's an LS style engine, no?
77mali- Donating Member
- Street Cred : 62
Re: Why doesn't my flex plate fit?
Came out of a 2002 Workhorse...L31 motor.
I have another flex plate from a 91 that matches the original turbo 350 torque converter bolt pattern.
I've just never heard of anyone running into this problem.
I thought I read just about everything on engine swaps.
Thanks for the numbers.
I have another flex plate from a 91 that matches the original turbo 350 torque converter bolt pattern.
I've just never heard of anyone running into this problem.
I thought I read just about everything on engine swaps.
Thanks for the numbers.
Sinister- G3GM Member
- Street Cred : 0
Re: Why doesn't my flex plate fit?
Usually torque converters have captive nut.
The one I'm working on has very short nuts and bolts.
Besides using thread locker,what are the safest nuts to use.
Thanks.
The one I'm working on has very short nuts and bolts.
Besides using thread locker,what are the safest nuts to use.
Thanks.
Sinister- G3GM Member
- Street Cred : 0
Re: Why doesn't my flex plate fit?
77mali wrote:If the motor is an '02, that's an LS style engine, no?
No.
jerry46765- Donating Member
- Street Cred : 20
Re: Why doesn't my flex plate fit?
Odd, I just dropped in a 97 vortec motor and had no issue with the TC bolting to the flexplate. My issue is happening with trying to get the mini starter to line up right! Cant the damn gear to engage.
Biomedtech- G3GM Member
- Street Cred : 5
Re: Why doesn't my flex plate fit?
Which transmission are you using?
The flex plate that didn't fit was from a motor home chassis and had a mini starter...with the 4l80E
Might want to try a regular production starter.
I plan on using the original full size starter,although I will be using a remote solenoid.
Try some starter shims.
The flex plate that didn't fit was from a motor home chassis and had a mini starter...with the 4l80E
Might want to try a regular production starter.
I plan on using the original full size starter,although I will be using a remote solenoid.
Try some starter shims.
Sinister- G3GM Member
- Street Cred : 0
Re: Why doesn't my flex plate fit?
Thats the plan. I'm going to put on the Tahoe starter and put a heat shield on it to attempt to prevent heat soak from the hookers.
Biomedtech- G3GM Member
- Street Cred : 5
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