I have a 91 Z28 with a 305 tpi, auto tranny. I am wanting to install a T5 from a donor car (92 RS 305 tbi). The plug for the automatic is a 4 prong and the standard has 2 prongs in the back for the speedometer and 2 on the side. What wiring modifications and/or ECM will I have to make without having to butcher the harness ?

Thanks in advance.

 

Ultimately your should have a manual tune for your ECM

You don't use the wiring from the auto plug ( is for the TCC )

You need to extend the back up switch wiring from the 6 wire switch at base of the auto shifter through the floor down to the reverse switch on the T5 ,
The P/N wiring from the shifter switch needs extending to the neutral safety switch on the clutch pedal.
The 2 remaining wires at the switch (org and blk ) get taped up and made safe

 

Thanks for the response. Sounds fairly simple.

So to be clear, I don't need or have to use the 4 prong plug. I just need to use the wiring from the neutral switch to the clutch petal?

 

I read your reply when I was half asleep. You answered everything I asked about so please disregard that last post. Thanks for the help.

 

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