hey guys i'm mark from ky i have a 90 irocz wit factory 5.7 l tpi and i ripped the auto out racing i have put a t56 in and everything is in great . all but my slave is leakin on my carpet . but any ways i need help with getting my speedo right i just sliced into the factory harness and hooked it to the one in da t56 and i dont think that is right i have read i will need to buy an adapter box to fix it but i was wonderin if i could just change the drive gear in the speedo ? any help would be greatly appreciated !!

 

If you have a stock T56 like out of a 93-97 car, then (1) there's no speedo gears to change, and (2) the only way to adjust the speedo without machine work to the extension housing is by way of an electronic "adapter box" because the T56 puts out something in the neighborhood of 40,000 pulses per mile (exact number depends on your rear gear) whereas your TPI computer is looking for 4,000 pulses per mile.
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Attachment?

 

Use the Dakota digital SGI-5 signal conversion box. I have been using one now for awhile and its working well.

 

I depends. What year is you car and is it a Camaro or Firebird. If you have a electronic speedometer which it shoulds like you do then you need the dakota box. If you have a mechanical speedometer then you need the Abbott box. I have the Abbott box for mechanical speedometer for sale in the parts for sale section.

 

ok what do i have to do to get this dakota sgi5 to work correctly ?

 

Buy it.

Hook it up.

Program it.

Not necessarily in that order... although the buying does have to come first.

 

What about modifying the DRAC?

 

There is no DRAC in a thirdgen, and even if there was, it wouldnt know what to do with a 40,000 pulse signal.

New member, please use the

 

thanx guys for all the help !! the sgi5 is on the why although programming it my be difficult since i am not very knowledgeable in that area. next thin is to get rid of the 9 bolt in place of a 10 or 12 bolt with 4.11's

 

For mine, I just changed the parameters on the PROM so it reads the T56 vss. No need for the Dakota box.