What should my RPM's be at? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72gmcshorty · 07-21-2003, 10:34 AM

When I'm on the highway cruising at about 60 - 65 mph, what should rpm be at? I have a 454, turbo 400 and 3:08 gears. My tach reads about 2500.

Tx Firefighter · 07-21-2003, 10:37 AM

Will need to know tire size too...

miket · 07-21-2003, 10:38 AM

I have 275/60's with a T400 and 502...mine is about 2500 at 60-65.

72gmcshorty · 07-21-2003, 10:50 AM

275/60 and 245/60

miket · 07-21-2003, 10:51 AM

I believe thats right....I have 3.08's too.

*MJF* · 07-21-2003, 10:57 AM

There is a calculator tool here:
http://www.ring-pinion.com/calculators.shtml

*racedvl* · 07-21-2003, 11:18 AM

My 69 with 235/75R15's and 3.73 gears runs 60 MPH about 2800 RPM's.

Longhorn Man · 07-21-2003, 07:10 PM

350/TH350 non lock up (not that the engine size matters) with 275/60 15s in the back spun by the stock 3.07 gears. (3.08 is car gears, trucks had 3.07...not that .o1 is gonna chainge anything)

07-21-2003, 10:34 AM	#1
72gmcshorty Registered User Join Date: Jul 2001 Location: North Delta, British Columbia Posts: 1,344	What should my RPM's be at? When I'm on the highway cruising at about 60 - 65 mph, what should rpm be at? I have a 454, turbo 400 and 3:08 gears. My tach reads about 2500. __________________ 1992 Gmc 2wd 1972 Chevy Blazer 2wd

07-21-2003, 10:38 AM	#3
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	I have 275/60's with a T400 and 502...mine is about 2500 at 60-65. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

07-21-2003, 10:50 AM	#4
72gmcshorty Registered User Join Date: Jul 2001 Location: North Delta, British Columbia Posts: 1,344	275/60 and 245/60 __________________ 1992 Gmc 2wd 1972 Chevy Blazer 2wd

07-21-2003, 10:51 AM	#5
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	I believe thats right....I have 3.08's too. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

07-21-2003, 07:10 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	350/TH350 non lock up (not that the engine size matters) with 275/60 15s in the back spun by the stock 3.07 gears. (3.08 is car gears, trucks had 3.07...not that .o1 is gonna chainge anything) Attached Images

07-21-2003, 10:37 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Will need to know tire size too...

07-21-2003, 10:57 AM	#6
MJF No longer truckless Join Date: Mar 2002 Location: Campbell, CA Posts: 299	There is a calculator tool here: http://www.ring-pinion.com/calculators.shtml

07-21-2003, 11:18 AM	#7
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	My 69 with 235/75R15's and 3.73 gears runs 60 MPH about 2800 RPM's.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.