Cheers, I searched but cannot locate a thread (if I missed it and this has been posted over & over please drop me a link.) I was a GM master Tech specalizing in driveability until 1997 when I took a goverment job which kept me out of the auto repair industry (I still had buddies working on stuff that I would advise from time to time.)
I built a 95 C1500 Chevy Suburban for towing a race car with a roller cam 5.7 / retaining the TBI and had the 4L60e professionally built to withstand the load. It worked perfectly until someone totaled it parked in front of my house. I then pulled the entire drivetrain with the PCM and original harness and installed them in a 1978 Cutlass body. The TBI wiring was simple but not being a "transmission guy" I would like to verify the trans wiring. All the plugs and the harness to the transmission were retained unmolested and I wired a relay for the starter as I found online. I retained the original VSS buffer and the Cutlass has a 3:73 axle out of a Monte SS which other than truck tire size it should be close. I am planning on using a Dakota Digital speedo cable driver motor instead of messing with the trans output shaft. Today I will wire in a N/C brake switch to signal the PCM "brake input" and allow proper TCC operation. I used the Monte collumn so I still need to locate the back-up light output from the 4L60e switch (easy enough with a test light.)
Any advice about the above or the questions below would be appreciated. (There is lots of info out there about LS conversions but the OBD-I 1995 TBI is harder to locate.)
Now the questions......
(1) Do I need to use a relay on the back-up light circuit or will the transmission switch handle the load of the bulbs?
(2) I wired the two pink wires feeding the transmission into ign switched fuses in the underhood fuse block I created. Is this correct .... all the rest of the EFI / TBI use these light gauge pink as switched ign so is this correct?
(3) There are a group of wires coming out of the trans harness that went to the truck's main harness. I suspect they are outputs from the neutral switch to the digital PRNDL which I will not be using.
Is this correct and can I just leave them open?
Thanks, Doc
I built a 95 C1500 Chevy Suburban for towing a race car with a roller cam 5.7 / retaining the TBI and had the 4L60e professionally built to withstand the load. It worked perfectly until someone totaled it parked in front of my house. I then pulled the entire drivetrain with the PCM and original harness and installed them in a 1978 Cutlass body. The TBI wiring was simple but not being a "transmission guy" I would like to verify the trans wiring. All the plugs and the harness to the transmission were retained unmolested and I wired a relay for the starter as I found online. I retained the original VSS buffer and the Cutlass has a 3:73 axle out of a Monte SS which other than truck tire size it should be close. I am planning on using a Dakota Digital speedo cable driver motor instead of messing with the trans output shaft. Today I will wire in a N/C brake switch to signal the PCM "brake input" and allow proper TCC operation. I used the Monte collumn so I still need to locate the back-up light output from the 4L60e switch (easy enough with a test light.)
Any advice about the above or the questions below would be appreciated. (There is lots of info out there about LS conversions but the OBD-I 1995 TBI is harder to locate.)
Now the questions......
(1) Do I need to use a relay on the back-up light circuit or will the transmission switch handle the load of the bulbs?
(2) I wired the two pink wires feeding the transmission into ign switched fuses in the underhood fuse block I created. Is this correct .... all the rest of the EFI / TBI use these light gauge pink as switched ign so is this correct?
(3) There are a group of wires coming out of the trans harness that went to the truck's main harness. I suspect they are outputs from the neutral switch to the digital PRNDL which I will not be using.
Is this correct and can I just leave them open?
Thanks, Doc
