Rear axle gears

[Srobinson4]

I converted my 727 to a A833.  I don't nave much knowledge about rear ends.  What gear ratio would make this car quicker off of the line with out sacraficing streetability.  It is currently a 340 car with a standard rear end.  Please assume everything else works properly.

SRR

[72hemi]

With small blocks I like to run 3.91  gears or lower even with an automatic, and 3.55 for big block cars. Also streetability is a relative term, highway driving is what will really determine how low you should go.

[Chryco Psycho]

there are a # of options here , if you use the OD 833 4 spd when you convert 3.91 would be my choice , as you will have tons of low end power & still have around 2.80 for the highway , if you are going to a regular 833 3.23 or 3.55 aree good all round gears , it really depends what you want the car to do & how much time you spend cruzin , city commuting or highway driving

[Srobinson4]

there are a # of options here , if you use the OD 833 4 spd when you convert 3.91 would be my choice , as you will have tons of low end power & still have around 2.80 for the highway , if you are going to a regular 833 3.23 or 3.55 aree good all round gears , it really depends what you want the car to do & how much time you spend cruzin , city commuting or highway driving

It it your opinion that the 3.91 will allow for no problematic highway driving?  Is there a middle ground between the 3.91 and the 3.55?  If so your thoughts please.

SRR

[Chryco Psycho]

there is a 3.73 available for the 8 3/4 diff
 persoanlly I would not choose 3.91 with any significant amount of highway driving Inless I was using the 833 Od trans 

[Srobinson4]

there is a 3.73 available for the 8 3/4 diff
 persoanlly I would not choose 3.91 with any significant amount of highway driving Inless I was using the 833 Od trans 

Does the fact that I am running 17"x7 front and 17"x8" rear magnum wheels on the car create issues with rear axle gearing?  For this set up what gears would you run?

SRR

[Chryco Psycho]

 The overall diameter of the tire & wheel combination would have to be similar so no it doesn`t effect the gearing   

[72hemi]

I drive my small block with 3.91 on the freeway all the time with no problems, but I don't usually cruise down the freeway at 80 mph in that car though.

[Srobinson4]

there are a # of options here , if you use the OD 833 4 spd when you convert 3.91 would be my choice , as you will have tons of low end power & still have around 2.80 for the highway , if you are going to a regular 833 3.23 or 3.55 aree good all round gears , it really depends what you want the car to do & how much time you spend cruzin , city commuting or highway driving

I don't have the A833 OD therefore I am taking your advise and going with the 3.55.  Can you suggest any vendors?

SRR

[Chryco Psycho]

are you just looking to buy the gear set or do you want the whole center section already set up?

[Srobinson4]

are you just looking to buy the gear set or do you want the whole center section already set up?

Just the gears.

SRR

[Chryco Psycho]

Summit , Jegs , Mancini are probably as cheap as anyone , should be in the mid $200 rpice range
 Strange , Motive , Eaton ,Richmond are all good makes

[Srobinson4]

Thanks for all help.

SRR

[vinb]

3.55 would be a good choice. 28" rear tire 275/60/15. I ordered mine from Summit and are Motive Gears, on back order from 3 weeks, should have them by the 30th. Never used Motive before so I like to try something different....Vin..

[1970hemicuda]

It it your opinion that the 3.91 will allow for no problematic highway driving?  Is there a middle ground between the 3.91 and the 3.55?  If so your thoughts please.

SRR

A 3.91 with 28" tires would effectively give you something in between ~