Factory Five IRS axles?

Ant · #1 (**permalink**) 03-06-2005, 12:26 AM

I would appreciate information on the length of the half shafts used with CV joints in the Thunderbird IRS setup?

I phoned a reputable axle manufacturer he told me they were 15" long, me thinks thats is not correct, but if they were more like 11" - 12" then I could use them!

John A. Simpson · #2 (**permalink**) 03-06-2005, 10:17 AM

Did you try checking at the FFR forums, I'll bet someone there like Larry N Johnson would have the info you need.

FFCobra

Ant · #3 (**permalink**) 03-06-2005, 10:31 AM

Thanks John will do!

grumpy · #4 (**permalink**) 03-06-2005, 11:19 AM

Ant,
The Factory Five pin drive rear IRS T-Bird/Cougar 8.8" axles are 15", but are that length for the reason of the FFR rear suspension design. The pivot point of the CV joints relative to your rear arm/hub pick up suspension points and shocks are critical to the life and action of the joint.
Personal eMail to continue discussion.
grumpy

enyawix · #5 (**permalink**) 09-29-2007, 07:10 PM

If I buy the IRS axles would it hurt my 1/8th and 1/4th mile times?

carbon777 · #6 (**permalink**) 10-22-2007, 11:19 AM

The answer is .....It mostly has to do with your set-up.

Get adjustable shocks and a few set's of springs.

There are many Mustang Cobras with IRS running low 10's ..... in a 3800 lb cars too.