IRS and wheel fitment - FFCars.com : Factory Five Racing Discussion Forum
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post #1 of 11 (permalink) Old 04-23-2019, 04:37 PM Thread Starter
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IRS and wheel fitment

Just realized that my IRS is 58"; standard is apparently 59"+. Should one adjust each rod end and extend the hub towards the fender 1/2" on each side or just add 1/2" spacer to position the wheels out further?

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post #2 of 11 (permalink) Old 04-23-2019, 04:47 PM
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Just realized that my IRS is 58"; standard is apparently 59"+. Should one adjust each rod end and extend the hub towards the fender 1/2" on each side or just add 1/2" spacer to position the wheels out further?
Unless the threads are at their limit I would avoid using spacers and adjust the rod ends, that's what they are for.

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post #3 of 11 (permalink) Old 04-23-2019, 08:14 PM
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I am just the opposite. As much trouble as it is to adjust those rod ends and maintain the alignment (I'd guess at a min 4 hours if you can align it yourself) I'd use 1/2 inch spacers in a heartbeat.
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post #4 of 11 (permalink) Old 04-24-2019, 06:41 PM Thread Starter
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either way its going to require some work. I have to install longer wheel studs if using a regular 1/2 spacer or grind pockets in the FFR wheels to accommodate a hub centric spacer. If I adjust the rod ends, will it have any affect on the axles? tnx
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post #5 of 11 (permalink) Old 04-24-2019, 06:49 PM
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either way its going to require some work. I have to install longer wheel studs if using a regular 1/2 spacer or grind pockets in the FFR wheels to accommodate a hub centric spacer. If I adjust the rod ends, will it have any affect on the axles? tnx
Which IRS are you using, old style or new?


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post #6 of 11 (permalink) Old 04-24-2019, 06:56 PM Thread Starter
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Older style from a Thunderbird. Its a Mark II. tnx
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post #7 of 11 (permalink) Old 04-24-2019, 10:36 PM
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Quote:
Originally Posted by Carlos Henriques View Post
either way its going to require some work. I have to install longer wheel studs if using a regular 1/2 spacer or grind pockets in the FFR wheels to accommodate a hub centric spacer. If I adjust the rod ends, will it have any affect on the axles? tnx
That would be a concern. Glad you reminded me of it. It was later than your MkII I think but there was a problem w/ axles that were too short so there can be a problem w/ length. The studs are not that tough to do. Bang the OE studs out w/ a small sledge. Put the new one into position w/ generous amount of bearing grease on the splines and the threads. Put 3 or more hardened washers, well greased, and a plain lug nut w/ the flat side against the washers, on the outside.
https://www.etrailer.com/Accessories...saAtVEEALw_wcB
I use an impact wrench but this can be done w/ a wrench or 1/2 drive ratchet and deep socket.

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post #8 of 11 (permalink) Old 04-25-2019, 12:23 AM Thread Starter
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i purchased a 'hub centric' spacer thinking it would be safer. it bolts on to the hub and has its own studs. but the FFR wheel do not have a pocket to accommodate the bolted studs..lol cant win. thanks for the advice guy
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post #9 of 11 (permalink) Old 04-25-2019, 12:32 AM
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Is this really an issue? Have you checked wheel/tire clearance as is? If not you can take the shocks off so you can check through the full range of motion of the wheels, mount the wheels and check clearance at full droop and compression. If there is no contact then you're good to go.
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post #10 of 11 (permalink) Old 04-25-2019, 02:47 AM
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Like Rick said check the clearance first and see if there is any contact at full compression you may find that adjustments may not be needed, if however you want to set up your IRS to be much more user friendly then consider Forte's IRS ends. You can set width, camber and toe adjustments much easier especially after the body is on.

Saul



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post #11 of 11 (permalink) Old 04-25-2019, 10:28 AM Thread Starter
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wheel clearance is not an issue. I just want the wheels flush with the fender. FFR sells their rear wheels with 5.5" backspace, they will fit nicely on a 59" rear. Somehow, I need to add 1/2" to each side hub, either adjusting the rod ends, (but not sure how it will affect the axles), or by adding 1/2" spacer to the Hub. I did found another option, ET wheels will sell me a set of rear wheels with a 5" backspace, solving this entire issue. Is anyone interested in new FFR wheels? LOL
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