Speedometer Calculation - The 1947 - Present Chevrolet & GMC Truck Message Board Network

phanatic32212 · 05-03-2005, 01:12 PM

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

05-03-2005, 01:12 PM	#1
phanatic32212 It's Done When It Runs!! Join Date: Sep 2002 Location: Jacksonville, FL (Orange Park) Posts: 220	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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