Gm 12 bolt 430 vs 433 gears
 

Which of these is preferred.pro gears in a heavy car.
Chris

Re: Gm 12 bolt 430 vs 433 gears
 

The one with the most teeth on the pinion would be my choice.
Pinion, That is where the failure usually starts...

Re: Gm 12 bolt 430 vs 433 gears
 

Just took my 4.30 pro gear out. Went with 4.88 pro gear as I have been running 1/8 mile. Car is 3360 lb. w/trans brake, w/sbc and with 220 runs they are perfect and quite. I would sell them cheap if interested.

Re: Gm 12 bolt 430 vs 433 gears
 

Jeff check your pm


Thanks
Nick

Re: Gm 12 bolt 430 vs 433 gears
 

x2

Re: Gm 12 bolt 430 vs 433 gears
 

Looks like 430 it is
10 vs 9
Thank you Adger for info
Now to find a set
If the sale here falls thru let me know
Otherwise if someone has a new set I'd be interested right now.
Chris

Re: Gm 12 bolt 430 vs 433 gears
 

I stand corrected. I just checked mine in box and it is 4.33 ratio. 9 pinion and 39 ring gear. Car has been 9.0s with 1.32 sixty on 10 inch tire and gears look excellent

Re: Gm 12 bolt 430 vs 433 gears
 

You know what, I didn't think deeply enough when reading that. I would go with FEWEST teeth on the pinion gear. That means the teeth that are there, are thicker/stronger.

Sorry for the confusion!

Re: Gm 12 bolt 430 vs 433 gears
 

Lenny, it's my thought that when you have more teeth on the pinion you'll have two teeth at the same time in contact with the ring gear for a longer period of time.
Maybe it's just me but I like the bigger pinion.

Re: Gm 12 bolt 430 vs 433 gears
 

As the pinion gear gets more teeth on it the diameter usually increases.
That increase in size has an effect on increasing the root width and diameter of the gear teeth. You need to check it to be sure, but it is usually the case.
Ask an old Modified or Gas racer which gear set held up better.
Dana 6.50 or Dana 6.17.
6.17 had a larger diameter pinion gear.