Pro Gears vs Street Gears?

Posted By: Cuda_Mike

Pro Gears vs Street Gears? - 05/30/14 04:31 PM

Recently busted the pinion gear in my Dana 60, never used pro gears in several years of racing, but I don't want another failure. Pros and cons? How long will pro gears last? Had 4.56 but had been planning to switch to 4.10's. 1.32 60' @ 3,200 lbs. Thanks for all input.

Posted By: 440lebaron

Re: Pro Gears vs Street Gears? - 05/30/14 06:13 PM

dana 60 4.10 progears 60ft 1.22 trans brake 540 ci only weight 2550lbs 5 years about 300 runs.

gary

Posted By: Tig

Re: Pro Gears vs Street Gears? - 05/30/14 09:21 PM

Be careful to get the correct carrier

Posted By: MR_P_BODY

Re: Pro Gears vs Street Gears? - 05/30/14 10:20 PM

Quote:

Recently busted the pinion gear in my Dana 60, never used pro gears in several years of racing, but I don't want another failure. Pros and cons? How long will pro gears last? Had 4.56 but had been planning to switch to 4.10's. 1.32 60' @ 3,200 lbs. Thanks for all input.

Are you running too many rpms at the traps to cause
you to go with the 4.10s... I myself have never run
a pro gear.. mainly due to it wasnt in my ratio.. so
I cant help there

Posted By: MRMOPAR622

Re: Pro Gears vs Street Gears? - 05/30/14 10:45 PM

Pro gears are softer,they don't break like a hard street gear,they are jut enough softer to cushion the shook at the hit making them better in a race-Car with slicks.But Pro gears being soft are not as good for the street because they will wear faster.

PS I know no one wants to hear this but that is one of the advantages of running a 9" ford rear end you can get just about any gear ratio you want.

Posted By: 64dodge572

Re: Pro Gears vs Street Gears? - 05/30/14 11:02 PM

I had about 650 runs on an all new Dana 60/4.56 pro gears, twisted an axle at that point, replaced both axles, about 20 passes later broke the ring/pinion. 2800# car running 5.50's 1/8" mile.

Posted By: mr_340

Re: Pro Gears vs Street Gears? - 05/31/14 01:37 AM

Can you just have the gears tempered to get them a little less hard? Has anyone measured the hardness on each type?

Posted By: markz528

Re: Pro Gears vs Street Gears? - 05/31/14 01:51 AM

Quote:

Can you just have the gears tempered to get them a little less hard? Has anyone measured the hardness on each type?

Yes you can but it can be expensive to do correctly. It was a trick stock racers did years ago.

I had a set done probably late 80's or early 90's. I may have the original and after hardness somewhere, but I will have to look for it.

The trick is that you need to harden the surfaces after tempering or else you have excessive wear.

The outfit I had do mine did some sort of spray to surface harden the teeth. It was not very effective. After 75 runs, I inspected the gears had almost 100% tooth contact and the gears deformed to the point that the edges of the gears rolled over.

I was cheap and cleaned the edges up and ran it for many years and many runs that way. Never got worse. Sold the rear end about 12 years ago - it never failed on me.

My metallurgist says that what should of been done after the gears were softened is the root of the gears should of been masked and then the teeth hardened by carburizing.

Posted By: Plymouth340

Re: Pro Gears vs Street Gears? - 05/31/14 03:43 AM

I have Richmond 4.88 pro gears in my dana 60. put them in in 1990 made about 1500 passes so far..no issues.. car weights 2830 lbs