I just picked up a clean IRS in a damn good deal yesterday....how can I tell, without tearing into it, what year it is? Any specific part numbers I can look for? I have read that the termi's had larger pinion flanges but havne't seen any dimensions to go by...

Any info is great. Thanks!

 

I'll count out a 99 possibly.

AFAIK, my stock 99 IRS has rounded subframe bolts with an allen head. It's the bolt that people typically get "low profile" ones, or grind them down due to tire rubbing.

I don't know what kind of shocks the 99/01's came with but I believe stock 03/04 cobras came with Bilstein shocks...which it looks like you have in the picture.

 

I see a partial part # on the half shaft. it is the yellow tag the Ford # starts "2R3V" it should have a few more #'s followed by a couple of Letters put that # in and google it and if it comes back as a 28 spline you have a 99 IRS

 

2r3v-138AA is the number on the tag. I have tried looking it up but I am not having any luck yet. There are other numbers below it but I haven't looked them up yet

 

Try using 2R3V-4K138-AA

 

You can call Ford parts department and have them supply you with axle part numbers for all 4 years of the cobra if you play your cards right lol

 

i am guessing that it is a 03-04 or the previous owners of it put bilstiens on

 

I tried calling FRPP's tech line today and the guy at SVT couldn't tell me anything nor could he possibly give me any dimensions of the pinion.... Acted like there was no available info and it was all a secret....yea 10 years later lol

well the 2r3z 4k138 aa is the cobra number I keep seeing pop up....IDK

I talked with the guy I got it from and he said it was a termi IRS...he doesn't know a whole lot but I haven't found anything yet to tell me different. I know it has 3.55's in it right now and an aftermarket brace..at least the red brace doesn't look factory from what I can tell lol.


I know I just need to pull an axle and count the inner spline for a closer answer. I just wish someone could tell me the pinion size or the driveshaft size, bolt spread dimentions...something lol

 

If your wondering if the pinion flange is different than a SRA the answer is yes. Just put the pinion flange from the SRA on the IRS and your DS will bolt right in. This is what I did for my swap.
And stop calling it a "Termi" it's Terminator "termi" makes the car sound gay

 

Those are 03-04 cv shafts. As to the rest of it who can say for sure. 03-04s also came with a front differential torque brace.
http://fulltiltboogieracing.com/FT%201290.htm