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Independent Rear Suspension Forum » S550 Mustang IRS » 8/30/2019 1:45 pm

PaulProe
Replies: 6

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I built my cobra rear end very similarly. Used half shafts from The DriveShaft Shop. They use Porsche 930 style halfshafts with adapter ends to match the Ford components.

Paul

Independent Rear Suspension Forum » S550 Mustang IRS » 7/25/2017 6:17 am

PaulProe
Replies: 6

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Has anyone done any analysis or dimensional data on the 2015 Mustang IRS. Unless my searching was incorrect, I am not seeing any data on it in this forum

? ? ?

Paul

Independent Rear Suspension Forum » '95 T-Bird Rear Uprights / Bearing Problems » 7/11/2014 9:04 pm

PaulProe
Replies: 4

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Get out your big wrench, ChopChop.  The nut has to be torqued to 250 ft/lb

You can "borrow" the correct size socket from most autoparts stores as part of their tool loaner program

Paul

Independent Rear Suspension Forum » Axle Spline vendor » 7/08/2013 8:07 pm

PaulProe
Replies: 3

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I was only making a comment about the price, the real reason for my post was to locate a shop that will cut the inner axle splines and harden the shaft - one that others have found to be reasonably priced and quality work

Thanks

Paul

Independent Rear Suspension Forum » Axle Spline vendor » 7/05/2013 5:00 pm

PaulProe
Replies: 3

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Does anyone have a good source of a shop that will cut splines for narrowing a Ford 8.8 IRS.  DriveShaft Shop wants $600 for a complete set and that seems a little high.

Cutting splines into a 1.25" diameter bar and heat treating can't be that expensive.

?
Paul

Independent Rear Suspension Forum » DisAssemble outer joint » 11/06/2012 12:29 pm

PaulProe
Replies: 0

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Can anyone tell me how to get the outer joint apart on a Ford SuperCoupe halfshaft?

Inner Tri-Lobe was easy but I can't find the key to get the outer joint apart. It is the one that uses the large balls in it to form the joint. 

I can feel the retainer rings on the shaft but can't get to the one on the end to remove the shaft.  I've studied the balls and the cage looking for a particular angle that will allow it to come apart but can't find that either.

Surely there is a way to get the shaft out to change it to a shorter one

Thanks

Paul

Independent Rear Suspension Forum » T-Bird Half Shaft mods » 7/30/2012 4:01 pm

PaulProe
Replies: 8

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Spoke to Lee at the DriveShaft Shop and he said they don't use the Ford method of assembly, but use the spline to serve as the outboard stop then use a standard snap ring to hold the trilobe on - same as what I am doing.

Also pulled the halfshafts this weekend to take a look at them. 500 miles and everything is fine. NO issues, no wear marks or snap ring issues.

Keep your fingers crossed

Paul

Independent Rear Suspension Forum » T-Bird Half Shaft mods » 6/27/2012 2:53 pm

PaulProe
Replies: 8

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In another thread, I listed my problems of a Hurricane IRS based on a T-Bird IRS. I was having issues of the half shaft shuddering on tight turns or axle articulation. More research returned more info.

1) The inner tulip allows for 2" of movement - total. To check this, I was told to remove the axle nut, then press the stub axle in to the limits on the differential. I had .470 on the drivers side and .620 on the passenger side. Both were less than should be.

2) just by coincidence, I saw a thread on the FFCars forum of a member whose halfshafts were too short. He posted a picture showing the end clip damage. It was pointed out the halfshaft was assembled incorrectly.

3) further research I learned the Ford method of install was to put the trilobe on the shaft, install a .060 diameter wire in the end groove, then push the trilobe over the wire clip, trapping it in place, then adding a square constant section ring outside the trilobe to lock it in place. That put the trilobe almost flush with the end of the shaft.  Some aftermarket manufacturers modified this by cutting their splines to a given depth, then putting the trilobe on and then installing a snapring to keep it in place. Depending on the design parameters, this could make your halfshaft an incorrect length if you designed for one style and installed the other style

but it presented a novel fix for my problem -  if I removed the square ring and snapwire, Push the trilobe onto the shaft so it bottoms out on the splines, then install a snap ring to hold it on, it would be moving the trilobe away from the differential about .250 - enough to relieve the bottoming issue I was having.

I put this into place and my bottoming issues dis-appeared. but the nagging question, is am I setting myself up for future problems? How does one know the amount of load placed on the retainer rings and spline ends when the vehicle is moving. Granted, all pieces are free to travel and

Independent Rear Suspension Forum » T-Bird Half Shaft Articulation » 5/28/2012 6:05 pm

PaulProe
Replies: 7

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Ralphy,
My IRS was produced by Hurricane Motorsports. It is based on the Ford TurboCoupe independent rear. Uses 8.8 center w/ Ford uprights. Halfshafts are shortened Fords. The control arms are by Hurricane. All the joints on the IRS have been converted to Spherical Bearing - no rubber in the system so it will stay pointed in the direction you want. Vast improvement in handling - except for this weird vibration.

It is very similar to the one supplied by Factory Five for their cars. The shortened halfshafts are the same and from the same supplier.

I have about 5000 miles on them. Travel is approx. 4" - 2 up, 2 down. I recently install bumpstops on the frame/upper arm so their is solid contact against a bumper rather than relying on the shock. Prior to this, the shock served as the stop and was constantly destroying the bearing joints. 

I initially thought my problem was tire rub - but after having been all over the car (and under) the tires aren't contacting anything. Plenty of clearance. The link you listed is the manual I got from Hurricane on it. If you are familiar with the Ford & FF5 IRS, it will look familiar.

When I go to the bump stops, I still have 1 - 11/2" clearance between body/frame to tire. If there was any contact, it would show on the glass or liner and nothing. Pretty confident it isn't the tires. Running Goodyear Eagle P295-50x15

Independent Rear Suspension Forum » T-Bird Half Shaft Articulation » 5/28/2012 3:31 pm

PaulProe
Replies: 7

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Does anyone know the range (degrees) of movement the Ford SuperCoupe IRS will accomodate?

I have a Cobra replica that uses a 8.8 centersection and SuperCoupe uprights. The halfshafts are shortened to accommodate the desired track.  Sitting at my prefered ride height, the center shaft of the halfshaft is angled up 2-3degrees, rather than sitting horizontal.

Going down the road, everything is fine, but when I get into some aggressive cornering, I get a shudder in the backend that feels as if the halfshaft is going into a bind. Kind of feels like a tire is rubbing but I've determined that isn't the case. No signs of contact or scuffing anywhere.

I tried a bottle of friction modifier, thinking it was the TrackLoc plates but that really didn't change anything.  If I raise the ride height a little higher, it does improve slightly. I haven't sat the height so high so as t have the halfshaft horizontal. Were I to do that, the car would look like it belonged with the mud-racers.

Does anyone have any ideas or similar situation on how this can be resolved

Thanks

Paul Proefrock
www.3x2CSX.com

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