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| | | | Joined: Mar 2006 Posts: 89 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 89 | Hello, I'm sure this has been asked a hundered times. I tried a search but didn't find what I was looking for. What can I safly and reliably cruise my 1960 C-60 at? Or better yet what rpm would be the target at cruise? Thanks for any reply on a subject i'm sure has been beaten into the ground.
240,000 worker bees!
1960 Two ton Chevy
| | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | 58-62mph should be safe. . .the best 3,000rpm is Max on the GMC V-6 or big block V-8's inline 6's should hold 3250rpm and the small block v-8's can handle 3500rpm. . .
As a rule of thumb I use 3,000rpm as my max speed across the board. . .
Mike
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: Dec 2006 Posts: 720 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 720 | What engine, do you have an overdrive or is 1:1 your top gear, what rear end ratio, and how tall are your tires. engine will tell us the RPM range and the rest I can plug in and give you approximate top speed.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber" 2007 Chevy Avalanche 2020 Jeep Cherokee Trailhawk, 2005 Harley Davidson FLHTCUI I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P
| | | | | Joined: Jan 2005 Posts: 1,602 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 1,602 | I've had the firetruck up to 55 but I wouldn't push it. As for a C60, I'd guess you would be in a simular size motor and truck as mine.
| | | | | Joined: Jul 2006 Posts: 149 Shop Shark | | Shop Shark Joined: Jul 2006 Posts: 149 | Flat out on level ground..... my '49 runs happily at 50mph...of course that gets slower (or faster) depending on hills and/or other terrain..........
Michael
speed is relative..... just not one of mine....lol
\'48 chev 2-ton boom truck (Boomer) '49 Chev 2-ton flat bed '65 Chev 35ft school bus '88 GMC 6500 '72 Superior 26ft class "A" coach '50 Farmall "M" '71 MGB GT '68 Austin-Healey Sprite '65 Austin-Healey Sprite and various other odd British cars and lots of old radios..... Although we know what the speed of light is..... What I want to know is... How fast is the speed of DARK??
| | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | my K-3000 run's 62.5mph@3,000rpm the 379M-V6 seem's happy at 3,000 rpm.
the B61T run's 72mph@2,000rpm I changed the mack triplex for my own version of the triplex. I combined a later model mack 5spd OD tran's with 3spd auxy now i got 2 OD's then i added a turbo to the 711END to create a 711END-T,stock 58mph@2250rpm now 72mph@2,000rpm. . .I gained 14mph and 2mpg. . .
mike. . .
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: Mar 2006 Posts: 89 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 89 | Freq2002, I'm running a 261, my top gear is 1:1, I am running 20 inch tires. As far as my rear end is I do not know the ratio. It's a two speed vac operated out of a 59'. I had a chipped gear set when I got the truck and I just replaced the third member. Apparently I had a 59 diff in it. I suppose the result of a early truck manufacture during a model change. Thanks!
240,000 worker bees!
1960 Two ton Chevy
| | | | | Joined: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | My '62 GMC 6500 with a 478 V-6 would go 62. But the truck was in real good mechanical shape and I would only run it that fast for short spurts.
50 to 55 seemed much more of a favorable cruising speed.
Bill
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
| | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | sound's about right. . . i had 1980's C-60 with a 350 that would run 65mph@3250rpm. . . with some over sized tire's. . .I put 11.00R20 T-831 Firestone tire's under a 8.25-20 Truck. . .
what will that 478 Hold for R's about 2500 ? 2750 top's ?
mike
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | Mike,
The truck didn't have a tach. It had a place for it, but it was blank. It had all the other gauges, air, oil, water, ammeter, but no tach.
But it was probably maxed out to what a 478 goes to at 62 MPH. I'd have to look it up to be sure.
Bill
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
| | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | If the 478 would cruze 3,00RPM I would swap out my 379M-V6 or a 478M-V6 in a heart beat. . .
Mike. . .
1962 GMC K3000, GMC-379 V6.
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