Irs?

[Phx99Cobra]

Im new to irs and was wondering what i should have done or add to help my lauch and tire shake. Keeping in mind the cost factor

[BurnTire]

Im new to irs and was wondering what i should have done or add to help my lauch and tire shake. Keeping in mind the cost factor

Drag Radials will get rid of a bunch on the street.

At tire like ET Streets or Slicks with a flexible sidewall will eliminate hop at the track

[Phx99Cobra]

Thx. Will i have to replace the half shafts as i heard most people do. I plan on getting 4:30 gears. What gears is everybody running in their cobras

[BurnTire]

Thx. Will i have to replace the half shafts as i heard most people do. I plan on getting 4:30 gears. What gears is everybody running in their cobras

Read this before your replace the half shafts to LVL 5's.

http://www.highperformancestangs.com...ead.php?t=2514
http://www.highperformancestangs.com...ead.php?t=2713


I have the stockers back on and have a pile of low 11 and high 10 second timeslips.

Wheel hop kills the shafts.

[Phx99Cobra]

The stockers have held up with the slicks? Have you or are you going solid?

[BurnTire]

The stockers have held up with the slicks? Have you or are you going solid?

Yes they have held up. I may go Solid, but not time soon.

[Phx99Cobra]

I believe the 03 shaft are different than my stock 99 shafts. If so should i at least upgrade to those stock shaft?

[BurnTire]

I believe the 03 shaft are different than my stock 99 shafts. If so should i at least upgrade to those stock shaft?

Yea the 03/04 are stronger.
I am taking a break from mods for a while. I probably will do the solid next fall. Or I may just run the stockers until they break.

[Phx99Cobra]

Thanks for the help with my desicions. It almost sounds like it may be more cost effective to go solid

[99_venom]

Thanks for the help with my desicions. It almost sounds like it may be more cost effective to go solid

The 99 Cobra IRS has 28 spline shafts, the 01/03/04 are 31 spline. I have a set of raxles in mine to work with the 28 spline IRS.

However if you plan on doing gears then just jump up to a 31 spline carrier when you do the gears and then use the 03/04 shafts. I am also running the Detroit True-Trak in my 99 IRS and I love it. Be careful on the stock 99 shafts with slicks or ET Streets, the outer spline is where these break...then the wheel gets a little crooked, not good if you are moving fast when it breaks. However most of them break right at the line.