What RPM

[Brillo1974]

Just curious who is running a 4 speed with 323 gears and what you are running for RPM at 70 mph? I changed over to a 391 with my auto before I put my 4 speed in and am thinking of changing back to the 323. If you have this setup how is the performance with the 323 and 4 speed? I have the close ratio 4 speed that was put in the TA and AAR's. Also if you have this setup what tooth speedo gear are you running, I have 15 inch wheels and basically 27 inch tires.

[brads70]

Try this.....     http://vexer.com/automotive-tools/speed-rpm-calculator

[HP_Cuda]

Should be close to 2600rpm but I am running a 28" tall tire.

[Brillo1974]

Try this.....     http://vexer.com/automotive-tools/speed-rpm-calculator

That's pretty cool I guess my tires are 28" so it would put me at right around 2700 rpm with the 323. 

[Fern]

I have a 4 speed and 355 gears. I think about 26" tall tire.
At 70 I at 3200 rpm

[bc3j]

2859 @ 70mph with 26.5" tire. It's an auto but still 1:1 final with 3.23 gears.

[74BlueFish]

At 70 I'm at 1700.    With 3.55 and a viper 6 speed
 

[GoodysGotaCuda]

At 70 I'm at 1700.    With 3.55 and a viper 6 speed
 

Tire height?

I should be a tad higher with 3.91s and a 0.63 t56 magnum.


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[74BlueFish]

Nitro 555  285/40-17.   I think they are 25.9. Tall

[GoodysGotaCuda]

Nitro 555  285/40-17.   I think they are 25.9. Tall

Gotcha, I may be pretty close then. I'm at ~28.5" on the rear.