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how fast you going?

mudbug660

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mudbug660 Enthusiast

mudbug660

Posted
Posted

At around what speed are ya'll hitting 2,000 rpm's. My friend has a 99 1500 Z71 nbs that I think has 4.10 and he hits 2 grand at around 65. His dad has an '02 z71 and I think he has 3.73 and he hits 2 grand a little after 65. Well on my truck I hit 2 grand a little after the speed that he does So I was thinking that I had 3.42's. But my boss just got an 05 z71 cc and he hits 2 grand at a later mph than I do. To say the least I'm a little confused. (Me too buddy :cheers: ) Could somebody shed some light on this.

Nick99Chevy Enthusiast

Nick99Chevy

Posted
Posted
At around what speed are ya'll hitting 2,000 rpm's. My friend has a 99 1500 Z71 nbs that I think has 4.10 and he hits 2 grand at around 65.  His dad has an '02 z71 and I think he has 3.73 and he hits 2 grand a little after 65.  Well on my truck I hit 2 grand a little after the speed that he does So I was thinking that I had 3.42's.  But my boss just got an 05 z71 cc and he hits 2 grand at a later mph than I do. To say the least I'm a little confused.  (Me too buddy  :cheers: ) Could somebody shed some light on this.

 

 

 

Why don't you just check your glovebox codes?

 

GT4: 3.73:1 Rear Axle Ratio

GT5: 4.10:1 Rear Axle Ratio

GU4: 3.08:1 Rear Axle Ratio

GU6: 3.42:1 Rear Axle Ratio

vhato Enthusiast

vhato

Posted
Posted
i gots 3.73 and 0.8 overdrive(i think) and 2k is about 68mph

 

 

 

 

 

You have a 0.696:1 Overdrive.

 

 

MudBug,

There is a 90% chance your boss has 3.23's since he has an '05 model. You probably have 3.42's.

OUMike Senior Enthusiast

OUMike

Posted
Posted

or..if you wanna check your gear ratio and don't have means to check the RPO codes plug in this simple forumla.

 

Gear Ratio = RPM x Tire Diameter\MPH x 336

 

:cheers:

Wingnut Senior Enthusiast

Wingnut

Posted
Posted
or..if you wanna check your gear ratio and don't have means to check the RPO codes plug in this simple forumla.

 

Gear Ratio = RPM x Tire Diameter\MPH x 336

 

:crackup:

 

 

 

 

 

:cheers: My gear ratio is 45,360,000 :crackup:

 

 

 

 

 

 

 

 

 

Yeah...I failed Match.

99-2door Senior Enthusiast

99-2door

Posted
Posted
or..if you wanna check your gear ratio and don't have means to check the RPO codes plug in this simple forumla.

 

Gear Ratio = RPM x Tire Diameter\MPH x 336

 

:crackup:

 

 

 

 

 

:cheers: My gear ratio is 45,360,000 :crackup:

 

Yeah...I failed Match.

 

 

 

 

 

No you did it right... the formula is wrong.

Should be:

Ratio = (RPM x Tire Diameter)/MPH x 336

 

Order of operations is important :crackup:

 

and that's assuming a 1:1 ratio in the transmission, which isn't true with an overdrive trans in 4th.

Wingnut Senior Enthusiast

Wingnut

Posted
Posted

Yeah...Um...I failed Math.

 

Come to think of it...I'm 33 and I've never been married, so I guess I'm failing at "Match" as well.

OUMike Senior Enthusiast

OUMike

Posted
Posted
or..if you wanna check your gear ratio and don't have means to check the RPO codes plug in this simple forumla.

 

Gear Ratio = RPM x Tire Diameter\MPH x 336

 

:crackup:

 

 

 

 

 

:cheers: My gear ratio is 45,360,000 :crackup:

 

Yeah...I failed Match.

 

 

 

 

 

No you did it right... the formula is wrong.

Should be:

Ratio = (RPM x Tire Diameter)/MPH x 336

 

Order of operations is important :crackup:

 

and that's assuming a 1:1 ratio in the transmission, which isn't true with an overdrive trans in 4th.

 

 

 

 

 

haha sorry about the order of operations. I actually got the formula from a book "Auto Math" by John Lawlor, its pretty cool.

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