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05-03-2005, 01:12 PM
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#1 |
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It's Done When It Runs!!
Join Date: Sep 2002
Location: Jacksonville, FL (Orange Park)
Posts: 220
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Speedometer Calculation
Sorry for the long post, but this don't sound right to me and I know one of you guys will know. I've looked almost everywhere on the net and I can't find what I am looking for. I need to find my true speed based on rpm and gear ratio. I have 3.07 rear with th350 tranny, and at 3200 rpm the speedometer reads 71. I am running a 26.4 tire (295/50/15) in the back and 235/60/15 in the front. I had a friend drive next to me and give me a thumbs up @ 60 mph. At 60 mph this is all of the info that I had.
Thanks in Advance JAke
__________________
 Or Give Me DEATH
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05-03-2005, 01:25 PM
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#2 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,354
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Try this one.
http://www.angelfire.com/fl/procrastination/rear.html
__________________
RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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05-03-2005, 01:31 PM
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#3 |
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It's Done When It Runs!!
Join Date: Sep 2002
Location: Jacksonville, FL (Orange Park)
Posts: 220
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That one says 81 mph and I really don't think that is right. I have a posi unit, that wouldn't have anything to do with it? The numbers stamped on the ring gear is 14:43. <-- 3.07, right?
__________________
Or Give Me DEATH
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05-04-2005, 01:19 AM
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#4 |
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Senior Member
Join Date: Apr 2004
Location: sw colorado
Posts: 2,720
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at just over 2500 you should be going 65, 2150 is 55mph, 2350 is 60, 71 is 2770
ryan |
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