Tone rings

11657 Views 12 Replies 8 Participants Last post by Primus, 6 mo ago

dbilik

Discussion Starter · Jun 17, 2009

I understand it to be that the 4.7L Powertechs from 2002 on have a 32 tooth tone ring and prior to that they are using a 16 tooth tone ring. I also understand that it is possible to swap the tone rings. Aside from swapping, can you get your PCM flashed or get a new PCM to use a 32 tooth tone ring engine in a truck that originally came with a 16 tooth tone ring powertech? Thanks.

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DodgeDak

· #7 · Jan 23, 2021

AIR_RAM said:
I hope this helps...

1999-2002 4.7L - Jtec PCMs (3-plug PCM) use a 16 tooth tone ring
2003-2007 4.7L - NGC PCM (4-Plug PCM) use a 32 tooth tone ring
2008-up 4.7L - Im not sure, they may still use the NGC 32 tooth tone ring.

Also the CAM tone ring goes hand in hand with the PCM as well...so you need to make sure your camshaft tone ring goes with the correct crankshaft tone ring with the correct PCM.

The transition was done in the 2003 year and you may find a Jtec in a 2003 year 4.7L... So double check the PCM to make sure what you have.

SPEED SAFE, AIR RAM

I need more specific if you can, I have a 2003 Dodge Dakota 4.7l I’m doing head gaskets just have not removed the valve covers yet to look but my pcm has 4 ports in it but only three plugs the one port is empty. Is it a JTEC or ngc?

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DodgeDak

· #8 · Jan 23, 2021

DodgeDak said:
I need more specific if you can, I have a 2003 Dodge Dakota 4.7l I’m doing head gaskets just have not removed the valve covers yet to look but my pcm has 4 ports in it but only three plugs the one port is empty. Is it a JTEC or ngc?

Reason why is I want to replace timing too but what kit? Any suggestions on that too?

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