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  • speedo problem when swapping transmissions

    hey i got a 93 firebird with a GN drivetrain in it. We got pretty much everything worked out electrical, except for the speedo. The old transmission sent the gauge the speed, but the GN tranny does not. Any idea how to get the speedo to work. I know someone has done a carbed 350 swap into a 4th gen fbody, and they probably used the TH350, th400, or the 700r4. I have the 200r4 and none of thes trannys are electrical. Let me know any ideas you might have.
    1987 Buick Grand National drivetrain in my 1993 Pontiac Firebird. PT53 turbo, 212/212 comp cam, 3400 lockup converter, stock heads, Precision bar & plate FMIC with 3\" piping, 1994 z28 rearend, hotwired walbro 255 fuel pump, Nitto drag radials

  • #2
    do you have the correct gear in it?

    im not very good at internals of trans, but i'd start looking into the speedo gear and making sure you had the right color in there.

    i must've heard of that happening 20 times in the past 2 years, although i've never heard of it giving NO reading at all... usually its an incorrect one.

    sorry I couldn't be more help.

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