4000 rpm @ 55 mph - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wolfewerx · 02-23-2008, 06:37 PM

Lots of guessin' goin' on. Jack the diff up and turn a wheel and DETERMINE the gear ratio. Measure your tire diameter. Get or borrow a handheld tach and compare rpms. Get or borrow a GPS and check your speedo for error. Have a look and identify your transmission. All this is stuff you really need to know about your truck. And if you are 4x4 you should check the front gears also. BTW- when you're under there check your diff levels.

At 4000 RPMs on a commuter - the wind noise should be fighting the exhaust burble and the hiway patrol should be droppin out of sight!!!

02-23-2008, 06:37 PM	#26
wolfewerx Registered User Join Date: Dec 2005 Location: waterloo ontario Posts: 19	Re: 4000 rpm @ 55 mph Lots of guessin' goin' on. Jack the diff up and turn a wheel and DETERMINE the gear ratio. Measure your tire diameter. Get or borrow a handheld tach and compare rpms. Get or borrow a GPS and check your speedo for error. Have a look and identify your transmission. All this is stuff you really need to know about your truck. And if you are 4x4 you should check the front gears also. BTW- when you're under there check your diff levels. At 4000 RPMs on a commuter - the wind noise should be fighting the exhaust burble and the hiway patrol should be droppin out of sight!!!



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