Gm 12 bolt 430 vs 433 gears

chris ok · 06-04-2017, 11:03 PM

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

Adger Smith · 06-05-2017, 03:44 AM

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

Jeff Stout · 06-05-2017, 10:19 AM

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.

nickh · 06-05-2017, 11:06 AM

Jeff check your pm

Thanks
Nick

Lenny5160 · 06-05-2017, 12:47 PM

Quote:

Originally Posted by Adger Smith

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

x2

chris ok · 06-05-2017, 02:01 PM

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

Jeff Stout · 06-05-2017, 03:06 PM

Quote:

Originally Posted by Jeff Stout

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.

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

Lenny5160 · 06-05-2017, 03:35 PM

Quote:

Originally Posted by Lenny5160

x2

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!

Chevy55 · 06-05-2017, 07:40 PM

Quote:

Originally Posted by Lenny5160

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!

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.

Adger Smith · 06-10-2017, 02:12 AM

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.

06-04-2017, 11:03 PM	#1
chris ok Senior Member Join Date: Jul 2002 Location: Long Island, New york Posts: 592 Likes: 131 Liked 46 Times in 29 Posts	Gm 12 bolt 430 vs 433 gears Which of these is preferred.pro gears in a heavy car. Chris

06-05-2017, 03:44 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	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... __________________ Adger Smith (Former SS)

06-05-2017, 10:19 AM	#3
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,484 Likes: 65 Liked 704 Times in 281 Posts	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.

06-05-2017, 11:06 AM	#4
nickh Senior Member Join Date: Sep 2010 Location: Houston,Texas Posts: 816 Likes: 3,381 Liked 637 Times in 190 Posts	Re: Gm 12 bolt 430 vs 433 gears Jeff check your pm Thanks Nick

06-05-2017, 02:01 PM	#6
chris ok Senior Member Join Date: Jul 2002 Location: Long Island, New york Posts: 592 Likes: 131 Liked 46 Times in 29 Posts	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

06-10-2017, 02:12 AM	#10
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	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. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 06-10-2017 at 02:13 AM. Reason: sp