I have an 07 classic Sierra going from a 370 to a 408 stroker. How can I tell which reluctor I have without pulling the pan? I've heard I can look at the crank sensor plug and the color (either black or gray) should be a good indication of which one I have. Any input would be greatly appreciated.

 

One is grey one is black. Pull the sensor and look in there with a light. The 58tooth looks like a bicycle sprocket.

 

Is it a stock crank? If so doesn't the classics have the 24 tooth?

 

07 Classic have 24 tooth, no need to even look.

 

Mangled it's a stock crank now going to a stroker

Txavalanche thanks

 

The Crank Sensor on the side of the block Should be Black for 24X and Grey for 58x

You should have a factory 24x set up on an 07 classic truck.

HTH

 

I meant crank sensor. Don't know why I typed cam.

 

Its the DSM in you everything revolves around the cams in the 4g63's

I miss my GSX Guess i will have to get an AWD SS to fill that AWD void

 

You're probably right. I miss my 2G like hell

 

LOL mine was Red got it from the originall owner. She blew the motor. I rebuilt it with some nice goodies and enjoyed it for just long enough before I had to sell it. It was either sell it or start fixing every little thing and make it faster!!! It was cheaper to sell it!!! but it sure was fun to dump the clutch at 5k and take off like a rocket. or make a right hand turns at 50 mph...