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08-25-2006, 01:22 PM
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#1 |
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Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,131
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Speed vs RPM and gears
Ok, my wife's '68 SWB shows 2500 RPM while running 55ish with a TH350. Does this sound like 3:08 gears? I jacked up the truck and did the tire/driveshaft thing. This is the closest I could come up with. I'm trying to make the speedo read right.
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08-25-2006, 02:50 PM
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#2 |
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Account Suspended
Join Date: Aug 2006
Location: vacaville ca, because it as far from indy as i can be
Posts: 777
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Re: Speed vs RPM and gears
tire size in inches is a critical measurement in fiugring this out.
try this calculator http://sore4x4.com/home/gearcalc Last edited by trkklr77; 08-25-2006 at 02:56 PM. |
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08-25-2006, 03:27 PM
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#3 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: Speed vs RPM and gears
55mph at 2500rpm sounds a bit slow for 3.08 gears IMHO, my 4.56's turn that, but I have 31" tires.
__________________
1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's  1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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08-25-2006, 04:25 PM
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#4 |
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Registered User
Join Date: May 2005
Location: Texarkana, AR 71854
Posts: 397
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Re: Speed vs RPM and gears
prob 3.73
__________________
2006 Titan SE Crew Cab Daily Driver 2005 Mazda Tribute (Wifes car) 1969 C10 SWB 350/3 Fleet "Max" 1969 Chevelle 2 door 350/3 |
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08-25-2006, 05:39 PM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Speed vs RPM and gears
28 inch tall tires with a 3.07 gear and a non lock up Th350 spins about 2500 at 65 IIRC.
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