Street gear set in dragsters

December 26, 2018, 10:43 AM

SCDIV1

It is getting a Pro Gear set.....along with the other items needed to make that happen....

Dragracing is Latin and it means....HATEYURMONEY....LOL

January 01, 2019, 05:51 PM

Ron C.

quote:
Originally posted by SCDIV1:
My 9” Ford gears are cracked at the base of the pinion gear and at least one is cracked across a tooth. Ring gear looks fine. Gearset has been in the car 10 years! Gears are not Pro gears. Pinion is 28 spline and as far as I know all pro gear sets are 35 spline. My old dragster also had street gears in it and never hurt them. I can upgrade it easily to a pro set with some added parts and cost but since what I had lasted so long I’m wondering why bother spend $ for nothing.....

. Geeeze, you got 10 years out of them,.....what was you question. Running Street Gears in drag racing and them giving reasonable service life depends on the power level, vehicle weight and pinion size( ratio). I ran them in my light weight dragster to around the 6.70's before switching to Pro Gears,....never broke one.

Fellow racer and servant of the Lord of Lords
John 14:6
"Creekside Racing Ministry"
MFI system, ProCharger Non-intercooled [6.02 @ 229 or 3.91/660' soft tune and killing power above 6K rpm]
Ron Clevenger

January 02, 2019, 03:24 PM

RPROGAS

We broke a 4.30 street gear set in the Roadster about four years ago so I upgraded to the Pro series set. The overall cost of getting to and racing at an event these days in my mind justified the additional expense of the Pro gear set. I should have upgraded the 35 spline axles at that time, didn't, broke one and nearly wrecked the car. so I changed to the MW 40 spline axles and lightweight spool.

The carnage never seems to end, ain't racing' fun!!

Happy New Year Rich!

Bob

January 02, 2019, 05:54 PM

SCDIV1

I can’t really complain about breakage much. I’m glad I usually find things before it becomes an at track event. The cost is what it is and we all gotta pay to play...Happy New Year Bob

January 07, 2019, 08:37 AM

Goob

Running street gears in anything race only with an automatic trans works best if you set the gear up with as close to zero backlash as you can get it.

I've got a little runout on my spool, so I'm at about .0015"

I set up Pro gears at about .004"

January 23, 2019, 10:21 AM

Arron1320

quote:
Originally posted by Goob:
Running street gears in anything race only with an automatic trans works best if you set the gear up with as close to zero backlash as you can get it.

I've got a little runout on my spool, so I'm at about .0015"

I set up Pro gears at about .004"

I would have to disagree with this method as you are not allowing enough clearance for lubrication to happen. But just my .002

January 23, 2019, 02:44 PM

Goob

quote:
Originally posted by Arron1320:
quote:
Originally posted by Goob:
Running street gears in anything race only with an automatic trans works best if you set the gear up with as close to zero backlash as you can get it.

I've got a little runout on my spool, so I'm at about .0015"

I set up Pro gears at about .004"

I would have to disagree with this method as you are not allowing enough clearance for lubrication to happen. But just my .002

Believe me, I had SERIOUS misgivings about it when it was presented to me in 1995, but I've set up every race set that way since, and have had the easiest rolling, quietest rear gears, and never seen anything but perfect wear.

I have a fella with a 3000# + door car going 5.40's that gets 350-500 runs from his gear sets, in 3500# + runs in my car, (3250# @ high 1.3 short times) I have broken one gear set, from a violent wheel hop incident.

January 24, 2019, 11:51 AM

David Covey

quote:
Originally posted by Arron1320:
quote:
Originally posted by Goob:
Running street gears in anything race only with an automatic trans works best if you set the gear up with as close to zero backlash as you can get it.

I've got a little runout on my spool, so I'm at about .0015"

I set up Pro gears at about .004"

I would have to disagree with this method as you are not allowing enough clearance for lubrication to happen. But just my .002

Sorry Goob but I gotta agree with Aaron.
I have a friend who believes as you do and it's a constant disagreement between us. lol

As a side note. Get a good gear oil in it. Pay attention to the GL rating as that is what indicates the shock load abilities. The oil provides a wedge between the two parts. If it cannot get in there it can't protect them.
A very good read can be found HERE.

Use a synthetic too.. Amsoil,Lucas, or Torco.

Dave

January 24, 2019, 11:58 AM

David Covey

SCDIV1,

I know this isn't the answer to the original question, but figure it could help you or other out..

More info. One other thing I learned years ago from Richmond Gear.
Just like when building an engine. De-burr the ring and pinion. Take the sharp edges off of the parts. I've found gear sets that had tight spots and after deburring them they turned smooth.

I know you put a solid crush sleeve in there as well, right? lol

Dave

DC: Pro Gears

January 24, 2019, 12:04 PM

SCDIV1

New US Gear PRO gears, 35 spine pinion, new pinion carrier, new yolk.....solid spacer....new pinion bearings...

New axles, bearings, M-W brakes....dual caliper....foot and hand lever....

I got an education on 9" differentials.....

Its all back together....

January 24, 2019, 12:12 PM

David Covey

quote:
Originally posted by SCDIV1:
New US Gear PRO gears, 35 spine pinion, new pinion carrier, new yolk.....solid spacer....new pinion bearings...

New axles, bearings, M-W brakes....dual caliper....foot and hand lever....

I got an education on 9" differentials.....

Its all back together....

LOL... I bet you did...

Dave

March 19, 2019, 03:00 PM

Camaro80z

Bringing up this old thread as I have a question about the street vs Pro gears.

Is the reason to upgrade because of the metal used, or for the bigger pinion ?

I am trying to see if there is any advantage of the small pinion pro gears except for using the same yoke as I have now. Thanks.

March 19, 2019, 05:33 PM

BD104X

quote:
Originally posted by Camaro80z:
Bringing up this old thread as I have a question about the street vs Pro gears.

Is the reason to upgrade because of the metal used, or for the bigger pinion ?

I am trying to see if there is any advantage of the small pinion pro gears except for using the same yoke as I have now. Thanks.

Street gears are a harder material so they last. Pro gears are a softer material, so they can absorb the impact of hard launches better but they will wear out much sooner.

March 19, 2019, 05:51 PM

SCDIV1

The big pinion pro gears have a larger shaft diameter between the pinion bearings. 28 spline is small pinion and 35 spline is the big pinion. There are some small pinion Pro sets but a wider choice of gear ratios in the bigger pinion sets.

I changed pinion carrier, yoke, bearings, gear set and axles and all new brakes.

Car has not moved one inch yet!