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Discussion Starter #1
Hi

I read most of the threads on this topic
and tried some methods

So Tires from 31 to 35
gears from 3.54 to 4.10


I drove 20K in 12.5 minutes at 100K per hour
my trip marker was right on at every K marker and at 20

100/60x12.50=20.83

It looks like everything is OK

the only question
why is everyone passing me when I go 100K

thanks
Lou
 

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Discussion Starter #3
Hi

I did a 6" skyjacker lift on a 91 FSB
I became concerned about my speedometer reading when I am going 100 k about 60mph and everyone is passing me


so after reading some of the posts here I did my test listed abouve

I went from 31 to 35 tires and from 3.54 gears to 4.1
from my test it seems to be fine

tomorrow I am going to have someone drive beside me in a car just to doublecheck

regards
Lou
 

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Discussion Starter #5
Well after another test; I can almost conclude

Stock 91 FSB 5L
change tire from stock to 35"
gear from 3.54 to 4.10

no need to change speedo gear

truck has plenty of power
 
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