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theoryman 01-07-2013 09:16 PM

Flex plates
Does anyone know what the difference between the 1994-1995 Flex Plate and the 1996-2001 flex plate for the 5.2l is?

I think that I may have the 1996-2001 plate on my 1994 truck.

Any definitive way to tell without pulling the engine?

Truck runs, but seems like the ignition timing is very retarded when in open loop mode...

Seems like the split is at the change over from OBD-I to OBD-II.



Gen1dak 01-08-2013 10:40 PM

The only difference (for the 5.2) is the bolt pattern for attaching to the torque converter changed from the asymmetrical pattern to a 90-degree symmetrical pattern. If you have a '96-'01 flexplate, you would also have a matching vintage torque converter as they were used by Chrysler in warranty work. The only other way to use an OBD II-era flexplate on an OBD I-era torque converter is to oval-out the one bolt hole in the converter that doesn't match up. All OBD II flexplates and converters can be identified by the "90" stamp in the castings, indicating they are of the symmetrical 90-degree bolt pattern variety. For the 5.9, there is one additional difference in that the balance weight is on the torque converter for OBD I, but was moved to the flexplate for OBD II.

theoryman 01-09-2013 11:05 AM

So, changing the flex plate will not change the timing slots position relative to the crank sensor or to TDC of #1...

Thank you very much.


Gen1dak 01-14-2013 09:09 PM

Yeah. Looks like the issue you're having is somewhere else.

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