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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

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Old Nov 24, 2011 | 06:05 PM
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Default new to lt1, not to performance
just purchased my first lt1 powered 95 firebird formula a month ago and slowly learning the ins and outs. a couple questions im sure you pros can easily answer. first one is the speedometer is roughly 10mph (thats at 60mph per minnesota law, blah) the previous owner said it was due to a tranny mod but in nerwer vehicles i thought this would be a rearend item? 2nd is i noticed a "chip" mounted on the panel under the steering column which i have take a picture of attached. thanks!
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Old Nov 24, 2011 | 06:17 PM
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havent a clue as to what the chip is.



your speedo can be corrected with a tune/tuner.
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Old Nov 24, 2011 | 06:23 PM
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is it the rearend that has been swapped?
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Old Nov 24, 2011 | 06:28 PM
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Rearend gears could of been changed an then did not tune it to make it right
Last edited by Luke1996ta; Nov 24, 2011 at 06:34 PM.
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Old Nov 24, 2011 | 06:45 PM
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could he have meant a transmission swap from auto to manual or vice versa?

they use different reluctor wheels
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Old Nov 24, 2011 | 06:56 PM
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said the auto was rebuilt and a kit was put in it...
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Old Nov 24, 2011 | 07:22 PM
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a shift kit wouldnt change the speedometer calibration. A different set of gears in the rear would make more sense. unless someone messed with the pcm. who knows. Its all a guess until you can get in there a verfiy yourself.
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Old Nov 24, 2011 | 07:26 PM
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gear ratio again is drive shaft full rotation:tire full rotation correct?
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Old Nov 24, 2011 | 07:31 PM
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correcto mundo
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Old Nov 24, 2011 | 07:36 PM
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Gears or difference in tire size? (I can't imagine it being 10 MPH off from tires but who knows).
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Old Nov 25, 2011 | 10:21 PM
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what about a tq converter, could that do it?
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Old Nov 25, 2011 | 10:25 PM
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Perhaps the PCM was swapped to one with a different ratio or tire size.
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Old Nov 25, 2011 | 10:50 PM
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Originally Posted by bizerk1
what about a tq converter, could that do it?
No, it would not.
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Old Nov 25, 2011 | 10:52 PM
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got the stock size tire on the car in the back? if ur up around a 27-28 it will be that far off
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