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10-25-2015, 07:49 PM
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#1 |
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Registered User
Join Date: Apr 2014
Location: Birmingham, AL
Posts: 560
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Cruising speed?
So mine is a 1972 C20 converted to dually (flatbed).
4.10 rear end 1997 nv4500 225/70/19.5 all around 5.3L fully rebuilt (stock internals) Pontiac GTO intake and maf My cruising speed is around 75mph and it got as high as 83 mph. What is yours? I am not looking for 140 mph responses, lol, but just kinda what speed ya'll comfortable in your LS powered truck. |
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10-25-2015, 09:20 PM
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#2 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,601
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Re: Cruising speed?
Aruba I've got about the same setup you have except with a stock 6.0 , I've got the nv4500, 4.10, 235/85s and my cruise is same as yours..75-80
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10-25-2015, 09:29 PM
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#3 | |
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Registered User
Join Date: Apr 2014
Location: Birmingham, AL
Posts: 560
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Re: Cruising speed?
Quote:
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10-26-2015, 07:04 PM
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#4 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Cruising speed?
6.0 with 4l80E and 4:10 gears 29" tall tires.
60MPH @ 1800RPM's 70MPH @ 2200RPM's 80MPH @ 2600RPM's Give are take a few depending on road conditions. 
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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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10-26-2015, 07:46 PM
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#5 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,352
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Re: Cruising speed?
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'67 Panel Truck, Camaro LS1 5.7L/4l60e/3.73 posi/30" tires. I cruise the speed limit which in Iowa is 55mph on secondary roads, 65mph on most 4 lanes, and 70mph on Interstates LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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10-27-2015, 01:16 AM
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#6 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Cruising speed?
My truck likes 32, and 50 around local roads the best. With the somewhat aggressive way my shifts are setup, those are the sweet-spots. It doesn't like 25 or 45.
On the highway, it'll be fairly happy anywhere from 60-80, with 68 being its favorite spot.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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10-29-2015, 01:07 AM
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#7 | |
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My Spoon Is Too Big
Join Date: Mar 2010
Location: Magnolia Tx
Posts: 457
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Re: Cruising speed?
Quote:
and 4:56 with 265 75r16 ? Also what would I be looking at with that setup Acceleration 1/4 mile top speed Give real #s or a 1- 10 rating (1 worst 10 best)
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1972 C20, 03-14-10 Build Thread 2000 Silverado 4.8L, 11-04-13 (Currently Parting) 1999 Silverado 5.3L, 07-07-14. (Engine Donor) 2015 Ram 05-20-15 (Daily Driver) |
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10-29-2015, 09:08 AM
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#8 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Cruising speed?
Quote:
My 6.0 motor is all stock with headers and a dyno tune in it. The guy said it had 80,000 miles on it when I installed it. I haven't touched it except for plugs and wires and a water pump. I travel a lot and the truck runs the interstate a lot. I did the power tour the first year I had the motor in it and put 3800 miles on it in 7 days. I drove back from Dells Wisconsin to home in less than 16 hrs which is about 900 miles and we ran 80 MPH are more all day long! That including stopping for gas and eating lunch.
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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. Last edited by Andy4639; 10-29-2015 at 09:15 AM. |
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10-29-2015, 09:44 AM
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#9 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,928
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Re: Cruising speed?
Dukkie, I ran an excel program I have (I will try to attach but don't know that I can so e-mail me if you want).
The numbers for your setup would be in 3rd (1:1) at 70 it would be 3390 rpm, in 4th (.70:1) it drops to 2370 As far as acceleration the first gear in the 4l60s are low so according to my chart if you shift at 6000 rpm you would be running 40 in first and about 80 when you shift from 2nd to 3rd. Your top speed will be limited to the aerodynamics (and your @alls) and of course how much power to overcome that big front end (still aerodynamics) Good luck David
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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10-29-2015, 09:48 AM
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#10 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,928
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Re: Cruising speed?
So I cant take credit for this file I just found it so use it for what it is worth.
I cheated the upload and changed it to a .pdf just remove that and it is an excel file so after you save it and rename it you should be able to run it.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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10-29-2015, 06:50 PM
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#11 |
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My Spoon Is Too Big
Join Date: Mar 2010
Location: Magnolia Tx
Posts: 457
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Re: Cruising speed?
got it saved, converted, and opened. ill check it out thanks,
I also hacked the protection and unlocked the sheets as well
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1972 C20, 03-14-10 Build Thread 2000 Silverado 4.8L, 11-04-13 (Currently Parting) 1999 Silverado 5.3L, 07-07-14. (Engine Donor) 2015 Ram 05-20-15 (Daily Driver) |
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