Ive always been curious as to why neither one of these co. are mentioned as a possible alternative to the other popular gear sets here.
Does any one want to explain why or whats wrong with them ?
AAM = http://www.drivetrainamerica.com/p-8...px?cagpspn=pla

G2 = http://www.carid.com/1982-pontiac-tr...FZCDQgodIB0A3w

 

Don't know about G2, bu AAM is OEM. Probably some of the best gears that you can get. I don't know for sure, but they may be 2 cut gears.

 

How do the stock gears used in our cars differ from the AAM gear sets. They make a pretty strong statement in the add =

(This "Two-Cut" design also allows for easier set up in the aftermarket replacement business. The combination of materials, heat treating and cut geometry allows for a gear set that has ten-times the life of a non-OEM Ring & Pinion gear set.)

Are they talking about just street use or would that statement include some 1/4 mile track time as well ?

 

I found this at Richmond Gear and I guess it answers my last question =

8620 Standard Gears are primarily used in oval track and street applications. The material and heat treating provide excellent wear service life, but doesn't handle shock loads "as well" as Pro Gears.

"Pro" gears are designed specifically for drag racing. The 9310 alloy and heat treat are ideally suited to absorb high impact shock loads.

 

Pro gears are not for street use. They wear much quicker and will not last in every day driving.

The 2 step gears have not been around very long. I don't know exactly when they started using this process, but it's probably been within the last 10 years. AAM makes gears, axles, yokes and other rear end parts for GM. If you went to GM and ordered a new gear set for your car this is what you would get. These gears are very high quality, but can be a little more difficult to set up for older guys like me who have been setting up the old 5 step gears for more than 31 years. It's hard to learn new ways when you brain is getting older. The new gears run a much tighter backlash and the contact pattern is not centered like the old 5 step gears. In the 15 years that I ran my rear end business I can only remember setting up one set of these gears. They are just now starting to catch on in the after market.

The one set of 2 step gears that I remember installing were for a Dana 44 in a twin turbocharged 1200 HP 6 speed C5 Corvette that was drag raced regularly. We went to a lot of trouble to make that rear end hold up. There were no pro gears, spool or any other drag race parts for that rear end. I worked with Tom at Tom's Differentials and another shop in CA that specialized in high HP Vipers to get the gears criogenically treated, along with a custom set of 4130 axle stubs and some other special parts. Tom built a Dana Power Lock differential for it. As far as I know it never did break. I kept in touch for a few years and then didn't hear anything else from them. I think he had more trouble out of the clutch than anything else.

 

Are the older gear sets in our cars made of the 8620 alloy steel ?
If not what steel are they made from ?

 

They are made of a 8000 series steel. Not sure if it is exactly that one or not. The 8000 series steels are harder than the 9000 series that the pro gears are made from.

 

Thanks , there are some question Ive been wanting to ask for a long time here. I have done a extensive search on line but its nice to get answers from someone you know has the knowledge.

 

AAM is way overpriced. Yukon is just as good for less cost.