3.73 Gears?

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Apr 17, 2008 | 12:42 PM

#16

EnFuegoZ28

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Joined: Apr 2008

Posts: 464

From: Yuma, AZ

Quote:

Originally Posted by JakeRobb

Your tach might be inaccurate. It's a common issue with F-bodies for the tach to read high.

You can check this with any ODBII scan tool. The digital RPM readout you get from the tool is always accurate -- it's just the gauge on the dash that's the problem.

If it is accurate, you have 3.73s. If not, just do the math again based on your real RPM.

Will the tach only be off at higher RPM's? At Idle it reads around 750.

Quote:

Originally Posted by 30AnniversaryZ28

Or just do 70mph and put it in 3rd and if you're doing ~3700 rpms, you have 3.73, ~3200 and you have 3.23s

Will putting it in D keep it in 3rd? Is the OD the 4th gear? Well I will put it in D and test it out today after work.

Apr 17, 2008 | 04:51 PM

#17

MTBeni

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Joined: Jun 2005

Posts: 293

From: Goldsboro, NC

OD will let it shift into 4th. Put it in 3

Apr 18, 2008 | 03:19 PM

#18

TitoPR221

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Joined: Feb 2008

Posts: 292

From: Robinson Township, PA

Alternate way, count the number of driveshaft turns it takes to turn the tire one full circle. 3.23 is close to 3-1/4 turns, 3.42 is close to 3-1/2 turns, 3.73 is close to 3-3/4 turns.

Apr 18, 2008 | 03:38 PM

#19

EnFuegoZ28

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Posts: 464

From: Yuma, AZ

Quote:

Originally Posted by TitoPR221

Alternate way, count the number of driveshaft turns it takes to turn the tire one full circle. 3.23 is close to 3-1/4 turns, 3.42 is close to 3-1/2 turns, 3.73 is close to 3-3/4 turns.

I am getting some adjustments done on my exhaust next weekend, so when she is in the air I will find out what gears are in there.

Apr 19, 2008 | 12:50 PM

#20

SS44Camaro

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Joined: Jun 2003

Posts: 314

From: Amarillo, TX

3.73s are great for a DD in my opinion. thats what i run. give you a few tenths on the track and i have not had any problems with drivability. i can still go 140 if the road allows. i actually pinned out my 150mph speedo a few months ago. i would say i was going 155 red lined.

Apr 21, 2008 | 12:32 PM

#21

EnFuegoZ28

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Joined: Apr 2008

Posts: 464

From: Yuma, AZ

Quote:

Originally Posted by SS44Camaro

I haven't had a chance to open her up like that yet. I am eagerly awaiting the opportunity.

Apr 21, 2008 | 08:14 PM

#22

slowride94z

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Joined: Aug 2007

Posts: 746

From: Bennett N.C.

Quote:

Originally Posted by 30AnniversaryZ28

Or just do 70mph and put it in 3rd and if you're doing ~3700 rpms, you have 3.73, ~3200 and you have 3.23s

what effect does tire size have on this?

Apr 21, 2008 | 08:18 PM

#23

30AnniversaryZ28

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Joined: Feb 2008

Posts: 284

From: Charleston, SC

Quote:

Originally Posted by slowride94z

what effect does tire size have on this?

If its stock tire size, then none. If it's not stock, it'll be off. I dunno by how much or which way though.

Apr 24, 2008 | 08:05 PM

#24

showstoppers-96-Z/28

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Joined: Apr 2007

Posts: 151

From: virginia

I have richmond 3.73's and i run about 2600-2800 RPMs in OD down the highway. IMHO 3.73's are wicked for a DD. I love mine, with my trans hooked up right and a 2400/2600 stall im doing great. When i get the chance i plan to up the stall a bit with a reputable name and higher rate, a vigilante will really make her move!