like the subject says, well I got my 3.42 gear and I just need to know how much is my speedo off by, I going to get the new gears this weekend to fix it, but I need to know so I can avoid a ticket, I have a auto 89 L98 it had the 2.77 but now I got a 3.42 alright thanks guys.

 

Depends on how fast you are going. If you are going 5mph, your speedo is probably accurate. But at 100 mph it's way off.
http://www.f-body.org/gears/
use your tach and the above formula


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

82
hey thanks, I don't really get the chart, but I think that its alright up to 55 I won't know for sure till I get my new cord from auto x-ray. Alright thanks