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speedometer reading slower than actual speed
i swapped a '95 GMT gauge cluster into my squarebody. Everything is working great minus the speedo. i have the VSSB I yanked from the same truck and wired it without an ECM. My 33 inch tires (295/75/16) and 3.21's out back equal an input ratio of 0.605xxx. I calibrated the VSSB to that nearest jumper settings (0.604492) found on the chart at http://tbichips.com/?page_id=504. BUT the speedo reads 5 mph slower than actual speed.
i.e. If im going 40 on the GPS, the cluster speedo reads 35.
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*UNDER CONSTRUCTION*
'80 Suburban C20 (C6P) (Silverado)
- '68 472 (Edelbrock 1813, PH8026 LT's, H pipe) / '91 4L80 (manual shift,vac modulator, 350 converter) / 14B FF 3.21 G80 34' s/ '96 GMT400 interior
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