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#1 |
Registered User
Join Date: Jul 2010
Location: So Cal
Posts: 421
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Highway Speeds
Hey guys. I though maybe we could start a thread with our drive train combos and highway cruising speeds and RMP's.
I have a 68 and 67 and my main use for these trucks would be car show's / cruises not realy interested in going crazy fast or drag strips. I know alot of these trucks are revving to high heaving when going past 70 when idealy it would awsome to be cruising at 70-80 MPH at 23-2500 RMP ![]() Right now on the 67 67 SWB , I6 250 , Saginaw 4 speed , 3.08 rear end going 2500 @ 75 If you guys can post up the - Truck type - Engine -Tranny -Rear end gears -Height of rear tires and the RPM's when going 70-75 MPH.. Thanks! |
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#2 |
Registered User
Join Date: Nov 2011
Location: Kirkland, WA
Posts: 343
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Re: Highway Speeds
70 GMC SWB
327 ci 200-4R 3.73 posi 29" (235/75R15) 2200 RPM & 70 MPH |
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#3 |
Registered User
Join Date: Jul 2010
Location: So Cal
Posts: 421
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Re: Highway Speeds
Great crusing range. Havent really heard of that tranny though.
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#4 |
Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Highway Speeds
'72 Blazer 2wd.
454+.30 Tremec TKO500 3.08 rear 30" 295/50/18 2000 RPM @ 80mph
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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#5 |
Registered User
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
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Re: Highway Speeds
72 c-10
350 350 turbo 3:08 gears 29" 255-70-15 2200@60 mph 10 mpg |
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#6 |
Registered User
Join Date: Nov 2008
Location: Italy
Posts: 1,278
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Re: Highway Speeds
Hey PAWS, your setup has you running 2200 @ 60 mph? I would have figured a much lower RPM.
__________________
'68 C-10 SWB 383 Stroker (Sold 3/2/2013) '87 R2500 LWB 454 TBI converted to Carb ![]() |
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#7 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Highway Speeds
What do you get for mileage?
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#8 |
Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Highway Speeds
It'll give 15mpg @ 75mph. BUT, it's LOTS more fun blasting around with the secondaries open in the lower gears.
Vac. 750 Holley, performer RPM, low compression, peanut ports, mild hydraulic cam. Runs good on 87 octane.
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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#9 | |||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Highway Speeds
Quote:
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#10 |
Registered User
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
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Re: Highway Speeds
That's with pencil and paper.I can runaround 55 or56 and get about 13 to 14 thou. I'm thinking it mat be gas addidtives.I know my Nissan Quest has dropped also. I have tried different places but not enuff difference in mileage.
I ran my fuel line in the stock location and then my mileage dropped last year, do you think the heat from motor has caused the difference? And that's with a new Sun tach |
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#11 |
Senior Member
![]() Join Date: Dec 2011
Location: Laurel, Mt.
Posts: 522
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Re: Highway Speeds
'71 k10 lwb
350 sm465 3.73 w/posi 33's running at 2800 at 70 mine feels most comfortable at 60
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1972 Cheyenne Super 10 SWB,bucket seats,dealer cruise,tilt,tac,a/c,shoulder belts, 350/350 1971 K-10 Custom Deluxe 1971 K-10 Custom |
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#12 | |
Registered User
Join Date: Nov 2008
Location: Italy
Posts: 1,278
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Re: Highway Speeds
Quote:
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'68 C-10 SWB 383 Stroker (Sold 3/2/2013) '87 R2500 LWB 454 TBI converted to Carb ![]() |
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#13 |
Registered User
Join Date: Jul 2010
Location: So Cal
Posts: 421
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Re: Highway Speeds
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#14 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Highway Speeds
1972 K2500
350 TH350 4.10:1 235/85-16 12.5 mpg Pretty much as built from factory and driven as designed...drive right on down the hiway at hiway speeds,just like they did in the '70s when no one had overdrive and didn't worry about rpms going over 3,000. I think at 65 I am right about 3,000. That's the speed I drive...even in my newer truck with o/d.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 09-14-2012 at 09:49 PM. |
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#15 |
Registered User
Join Date: Nov 2007
Location: Central OK
Posts: 396
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Re: Highway Speeds
72 C10 Short/Step 2/3 drop
350/holley 600VS Saginaw 3 speed on column 3:73 gears in a 12 bolt 6" 295-50-15 3150@65 mph 14 mpg |
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#16 |
Registered User
Join Date: Nov 2008
Location: Italy
Posts: 1,278
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Re: Highway Speeds
68 C-10 SWB
383 ci 700r4 4:11 Eaton posi in 12 bolt 20" wheels 2300 RPM & 70 MPH
__________________
'68 C-10 SWB 383 Stroker (Sold 3/2/2013) '87 R2500 LWB 454 TBI converted to Carb ![]() |
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#17 |
Classic Chevy Recycler
Join Date: Dec 2007
Location: Alabama
Posts: 422
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Re: Highway Speeds
I've noticed lately the mileage in my 03 burb has dropped. I wonder how much ethanol is in our gas now? They use to post at the pump how much ethanol the gas contained but I haven't seen them posted in some time.
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![]() 2004 Chevrolet Trailblazer EXT 1970 Chevrolet C50 1979 Chevrolet C30 Need another 67 or 68 soon... |
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#18 |
Registered User
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
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Re: Highway Speeds
ja that's the reason I got rid of my 08 burb.It was getting about the same as the 72 at 65.Plus after this last back surgery it was a pain to get in. But I loved it. Long and solid black.paws bus. ha
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#19 |
Registered User
Join Date: Nov 2011
Location: Kirkland, WA
Posts: 343
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Re: Highway Speeds
This is the table I used when determining RPM/MPH with a 200-4r and a 29" tire. It didn't paste verywell from Excel it is is based on the overdrive of .67:1 so all figures in the table assume the Torque converter to be locked up in 4th gear. I run a Goodyear Wrangler P235/75r15 whuch is about the same height as the original "H" on the SPID.
Tach GR = gear ratio (3.73 x .67 = 2.499) TFT = Total Feet Travelled at Tach RPM * FT MPH 1000 2.50 3,025.96 34.4 2000 2.50 6,051.91 68.8 2500 2.50 7,564.89 86.0 2800 2.50 8,472.68 96.3 3000 2.50 9,077.87 103.2 3200 2.50 9,683.06 110.0 |
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#20 |
Registered User
Join Date: Aug 2012
Location: error 404 location not found
Posts: 816
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Re: Highway Speeds
67 c10 swb
350 turbo 350 3.73 P235/75 R.15 70-75 mph @ 3000-3300 rpm
__________________
1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll |
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#21 |
Registered User
Join Date: Aug 2011
Location: Atlanta, GA
Posts: 1,523
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Re: Highway Speeds
Subscribed. I will capture this and get back to you. I want to be dead on.
I am pondering my next move with my drivetrain (whether it be a 4L80E or a built T56) and something nice in front of it...5.3/6.0 or just a 383 stroker until I get my beloved 572
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Best Regards, Leon M. Instagram: @TheDirtyDianah
Bagged | 6.0L LS | T-56 (6-Speed Manual) | Turbo Burnout/Rolling Video: Chevy C10 Stepside 6.0L LSx & 6-Speed Manual |
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#22 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: Highway Speeds
Truck type 71 swb
- Engine small block 400 -Tranny th350 -Rear end gears 373 auburn posi -Height of rear tires 295.40.20 and the RPM's when going 70-75 MPH.. 2900rpm-3000rpm
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#23 |
Registered User
Join Date: Mar 2012
Location: Leanna, TN
Posts: 2,061
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Re: Highway Speeds
69 swb stepper
250 I6 TH350 3.42 or 3.08 gear (maybe somebody can tell from this info) 70ish (speedo a little off from gear change) @ 25-2700 rpm 255/70r15 tires 15+ mpg
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=MATTHEW 69 Stepper...Stroked & Bagged ![]() 2003 Chevrolet Z71 Ext. Cab 1995 Cavalier gas saver! |
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#24 | |
Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Highway Speeds
Quote:
I've got an app. on my phone, SPEED BOX, it's free and it's like havin' a speedometer in your pocket. I wanted to know how fast my golf cart would go.
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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#25 |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: Highway Speeds
71 swb
355 heads/cam 700R4 w/ 2200rpm converter 3.73 255/60/15 (28"-ish) 22-2300 RPM at 70mph locked. 2500-2600 unlocked. This is pretty much the ideal gearing in my opinion, although I prefer to cruise at 65mph. Every truck has an ideal cruising speed, mine is governed by road and wind noise, vibrations, etc.
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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