i did a t56 swap in my 91 firebird (originally had an auto) and it drives great, love it. i finally got around to hooking up some of the wiring and all went well except for the speedo. i got new plugs from hawks third gen and i just hooked up the plug to the wires that were on the original plug (yellow and purple). iknew it was going to be off but went ahead with it anyway. first off it read i was doin 100 when i was crawlin out of the drive way and when i got on the road to try and drive it the car didnt want to go anywhere. the engine was sputtering and dieing and stalling and it didnt want to move. i unplugged the wire and it was back to normal. so whats the problem and how do i fix it?

 

Dakota Digital SGI-5 converter box.

T56 VSS isnt calibrated for your speedo. That converter box will fix it though.

 

where can i get one and for how much?

 

is it a 2000ppm or 4000? i did this on mine when i went LSx, i had to jump some wires on the buffer box....

 

i dont know, how can you tell?

 

maybe pocket will chime in......?

 

The stock VSS puts out a LOT fewer pulses than the T56 VSS setup. Here, in the T56 sticky thread is the how-to-fix: https://www.thirdgen.org/forums/post...1-post147.html

Neither. My explanation of the differences:
https://www.thirdgen.org/forums/post...417-post4.html

 

ok well i guess im gonna have to find one of those decoder boxes. thanks for the help guys

 

its available at Summitracing... not too expensive:

http://www.summitracing.com/parts/DAK-SGI-5/

 

thanks, i'll order it now