Custom Jag IRS strength? (Pics inside)

[Jdata]

I called MW about the upgrade for the Jag. He gave me the information and two paths to take; use existing spline count or increase to 30 and convert to CV. The latter sounded the way to go however, the price shot up to near $5k...I did ask What he thought the power level it could hold. He said he wouldn't guess since it's a Jag rear but perhaps 300-400.. I am assuming per axle. Who knows..


So...

Then I started thinking about the other IRS systems out there because if you really think about it, a balls out straight axle is near $10K. The other IRS systems typically just need the CV axle upgrades.

[eschaider]

Originally Posted by Jdata

I called MW about the upgrade for the Jag. He gave me the information and two paths to take; use existing spline count or increase to 30 and convert to CV. The latter sounded the way to go however, the price shot up to near $5k...I did ask What he thought the power level it could hold. He said he wouldn't guess since it's a Jag rear but perhaps 300-400.. I am assuming per axle. Who knows..


So...

Then I started thinking about the other IRS systems out there because if you really think about it, a balls out straight axle is near $10K. The other IRS systems typically just need the CV axle upgrades.

The stuff I laid out in post #36 easily handles 750 WHP in 3,600 / 3,800 lb 03/04 Cobras. Less horsepower in a lighter car is a walk in the park for this type of IRS build and significantly, the price comes in well below your $5K target above.

The one item I left out of the list was the billet steel differential caps from Mark Williams. They are about $170 per pair => MW 8.8 Main Caps You will also need the outer knuckle kit which you can fabricate or buy from Ford's FRPP unit.


Ed


p.s. I have never heard an axle's rated power level represented in a per axle fashion. I believe the 300/400 power level representation was for the assembly and not per axle. The power level most likely has to do with the use of OEM quality parts throughout the Dana 44 build.

[joyridin']

Originally Posted by Jdata

I called MW about the upgrade for the Jag. He gave me the information and two paths to take; use existing spline count or increase to 30 and convert to CV. The latter sounded the way to go however, the price shot up to near $5k...I did ask What he thought the power level it could hold. He said he wouldn't guess since it's a Jag rear but perhaps 300-400.. I am assuming per axle. Who knows..


So...

Then I started thinking about the other IRS systems out there because if you really think about it, a balls out straight axle is near $10K. The other IRS systems typically just need the CV axle upgrades.

I put took mine and put int a Torsen style differential, 3.70 gears, and 30 spline axles. The brakes were upgraded to 11.5" and the axles are now 2.5" diameter. I have about 600 hp with no problems. My only concern is the outside quarter shafts, so I am looking into those.

Depending on the width of your rearend, there may be a lot of options. If you really want something bulletproof, you can buy a 9" IRS center section and build from there.