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.

Save

1 - 2 of 13 Posts

PBader

· #10 · 7 mo ago

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

So, I have an 03' Dakota 4.7 that we tried to tune yesterday. No go. I'm assuming that I have the JTEC (early 03') and not the NGC (later 03'). What could I swap this out with to make it tunable without issues? Does it need to be from a Dakota or will one from an 03 Durango work too? Looking to pick one up from the junkyard, or aftermarket, if someone has the correct part number. We will be eliminating all O2 sensors and all emissions, so that won't be an issue. Anything else that I should know? Thanks in advance!

Save

PBader

· #12 · 6 mo ago

Primus said:
You have the NGC controller because JTEC was only on the 2000 to 2002 Dakota's, I doubt there were many JTEC Dakota's in 2003 and that would be right at the changeover to NGC from the 2002 to 2003 model year.
What tuner were you trying to use on your truck? There are certain brands that were only available to these trucks.

We were using HP Tuners but when we plugged it in, it came up as "No Buss" and no details came up on the screen.

Primus said:
You have the NGC controller because JTEC was only on the 2000 to 2002 Dakota's, I doubt there were many JTEC Dakota's in 2003 and that would be right at the changeover to NGC from the 2002 to 2003 model year.
What tuner were you trying to use on your truck? There are certain brands that were only available to these trucks.

We were using the HP Tuner software. When we plugged it in, it came up on the screen saying "No Buss" and showed no details.

Save

1 - 2 of 13 Posts

Top Contributors this Month