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01-28-2016, 10:56 PM
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#1 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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MPH = RPM's
Here are a few shots while running down the interstate in the truck today.
I had to make a trip down to Atlanta to pick up some parts. I ran pretty much around 80 the whole way. Stock 6.0 with 4l80e and 4:10 gears. 29" tall tires 
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-29-2016, 12:44 AM
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#2 |
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Registered User
Join Date: Apr 2013
Location: Nor-Cal
Posts: 632
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Re: MPH = RPM's
Very Nice!
I need to check my rear end gear ratio. Now i have an idea of what to expect. thanks!
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WHO_DCTC - Wifes 05 Z-71 Build - Now defunct as she decided she wants an Escalade too Cream Puff - LS'd Square - Slow going on the back burner Tripple Threat - 3 Wrecks for the price of one build thread Project Delongdium - Step-Sons Plastic Clad 2003 Avalanche - DONE and Delivered. |
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01-29-2016, 02:50 AM
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#3 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: MPH = RPM's
This always throws me....I swear mine turns a slightly higher RPM than everyone else. I have a 4l80e also, 3:73's but a slightly smaller tire, and turns like 300-400rpm higher than you with the 4;10's.
Then again, my lockup converter might be smoked, so it might be the slip during lock.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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01-29-2016, 09:22 AM
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#4 | |
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*************
 
Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,858
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Re: MPH = RPM's
Quote:
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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01-29-2016, 11:18 AM
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#5 |
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Registered User
Join Date: Nov 2014
Location: Alameda, CA
Posts: 877
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Re: MPH = RPM's
I have 350/350/4.10 and 30" tires and don't enjoy high speed. I have a 3.73 rear end I have to throw in and sometime it'll get an LS and overdrive tranny. Then again, I don't have a tach so I'm going by ear.
Is your speedometer accurate?
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1973 C20, 350/350 |
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01-29-2016, 12:19 PM
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#6 |
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Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,051
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Re: MPH = RPM's
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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01-29-2016, 12:30 PM
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#7 |
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Registered User
Join Date: Mar 2015
Location: Morada, CA --- (Near Lodi)
Posts: 1,443
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Re: MPH = RPM's
Did you verify that speedo with GPS? its always good to check that.
there are apps on iPhone and Android that you can use right on your phone.
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My Build: 57 Chevy Pro-Street |
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01-29-2016, 12:41 PM
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#8 |
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Registered User
Join Date: Apr 2013
Location: Nor-Cal
Posts: 632
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Re: MPH = RPM's
The speedo in the first photo is a GPS speedo.
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WHO_DCTC - Wifes 05 Z-71 Build - Now defunct as she decided she wants an Escalade too Cream Puff - LS'd Square - Slow going on the back burner Tripple Threat - 3 Wrecks for the price of one build thread Project Delongdium - Step-Sons Plastic Clad 2003 Avalanche - DONE and Delivered. |
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01-29-2016, 12:56 PM
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#9 | |
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Registered User
Join Date: Mar 2015
Location: Morada, CA --- (Near Lodi)
Posts: 1,443
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Re: MPH = RPM's
Quote:
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My Build: 57 Chevy Pro-Street |
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01-29-2016, 06:57 PM
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#10 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: MPH = RPM's
My 02 Silverado, with 29 " tires will run 65 mph @ 2200, with a 3.73 gear...(speedo reads 70mph, but the thing was not recalibrated, after the gear swap). original gears were 3.42. My old longhorn, same tire size/taller gear, is a tick over the legal limit @ 2200....will cruise all day long @ 100 mph (3100 on the tach? specs in the signature...longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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