Rear IRS alignment procedure (BMR, Steeda)

[z06psi]

I cannot believe Ford did not put steel alignment pins in the body for the IRS. My 14 year old Corvette is like this.

I have both BMR and Steeda products to include Steeda IRS braces.

How do we know the thing is aligned correctly? The reason I ask is I have a knock and a shifting (it feels like it at least) in the rear on turns sometimes. It is a weird sensation. The car has been aligned by a reputable shop here on island. I have no uneven wear or anything. I have been under the car 10 times for this as well.

All bolts are torqued correctly and everything was torqued with the suspension compressed at ride height. I initially thought it was the sleeves BMR provides for the IRS bushing kit but I shortened them a little and the noise/feeling is still present. Looked at my springs and they are all seated correctly.

At a loss really. I will be under the car again this weekend replacing the half shafts after my issue with DSS that was resolved. I guess I will just take out the whole IRS and put it back in again.

Anyone?

Sponsored

 

[Coaster]

That could just be caused by the Torsen diff.

 

[derieuz]

Sounds like the torsen diff + diff bushings, i'd remove those and re-evaluate.

 

[z06psi]

No its not like that.

It did not do this when it was 100% stock.

 

[jasonstang]

You can always install the rear sub-frame alignment inserts.

 

[derieuz]

No its not like that.

It did not do this when it was 100% stock.

I'm saying remove the differential bushings, so you are trying to see if the noise goes away after having it close to stock

 

[Doctor Fishtail]

I cannot believe Ford did not put steel alignment pins in the body for the IRS. My 14 year old Corvette is like this.

I have both BMR and Steeda products to include Steeda IRS braces.

How do we know the thing is aligned correctly? The reason I ask is I have a knock and a shifting (it feels like it at least) in the rear on turns sometimes. It is a weird sensation. The car has been aligned by a reputable shop here on island. I have no uneven wear or anything. I have been under the car 10 times for this as well.

All bolts are torqued correctly and everything was torqued with the suspension compressed at ride height. I initially thought it was the sleeves BMR provides for the IRS bushing kit but I shortened them a little and the noise/feeling is still present. Looked at my springs and they are all seated correctly.

At a loss really. I will be under the car again this weekend replacing the half shafts after my issue with DSS that was resolved. I guess I will just take out the whole IRS and put it back in again.

Anyone?

This car is the worst built new car I have ever owned. The more I am under the car and looking at things it makes me NOT want this POS. The suspension needs SO much work to make it perform. BMR and Steeda are going to get rich off suspension parts. :lol: Thank God that we can at least buy good parts from them.

 

[Pony15]

This car is the worst built new car I have ever owned. The more I am under the car and looking at things it makes me NOT want this POS. The suspension needs SO much work to make it perform. BMR and Steeda are going to get rich off suspension parts. :lol: Thank God that we can at least buy good parts from them.

:lol::lol::cheers: Yeap agreeed :lol:

 

[z06psi]

You can always install the rear sub-frame alignment inserts.

I cannot with the BMR IRS bushings. There is a steel sleeve inserted where those go. Maybe I am missing something.

I'm saying remove the differential bushings, so you are trying to see if the noise goes away after having it close to stock

Differential bushings. I am trying to understand what you are suggesting. I have the BMR diff bushings. The stock ones have to be destroyed to get them out. What would take their place?

This car is the worst built new car I have ever owned. The more I am under the car and looking at things it makes me NOT want this POS. The suspension needs SO much work to make it perform. BMR and Steeda are going to get rich off suspension parts. :lol: Thank God that we can at least buy good parts from them.

Yeah one would think that with an IRS you would want guide pins in the chassis to help center and place the IRS. Cost is negligible to do this.

 

[rvlyssup]

I cannot with the BMR IRS bushings. There is a steel sleeve inserted where those go. Maybe I am missing something.

You just need to trim (shorten) the front sleeves to work in unison with the CB005s. Then just install the other half of the STEEDA alignment kit for centering the rear of the cradle. IMHO, the CB005 up front is more than capable by itself. Just use half of the STEEDA kit for the rears.

 

[z06psi]

All four of my BMR IRS bushings have the steel inserts.

 

[rvlyssup]

You can always install the rear sub-frame alignment inserts.

All four of my BMR IRS bushings have the steel inserts.

Roger that...but what I was clarifying was what jasonstang had meant by using subframe inserts to align the cradle & not the cradle bushings.

http://www.steeda.com/steeda-s550-mustang-irs-subframe-alignment-kit-2015-all-555-4438/

 

[z06psi]

Roger that...but what I was clarifying was what jasonstang had meant by using subframe inserts to align the cradle & not the cradle bushings.

http://www.steeda.com/steeda-s550-mustang-irs-subframe-alignment-kit-2015-all-555-4438/

So for the BMR bushings I have the bushings that go in the mounts and then there is a steel sleeve that inserts around the bolt like the Steeda kit. Basically centering the bolt in the bushing.

I thought initially the steel sleeve was making contact with the frame of the car and was slipping off the bolt hole and causing my noise as well as my "shift". After shortening the sleeve it was not the culprit.

This is why I am at a loss. I will try and get a video of it but it honestly sounds as if there is something slipping against the body of the car and shifting the entire body as the wheels and tires stay in one place. If that makes any sense at all.

And then again it could be the Torsen. Cause it does not do it higher speeds. Only slow speeds. Let say 30 MPH or less. Car feels solid in the corners.

Maybe I didn't hear it or feel it when stock cause of all the slop in the stock bushings.

 

[rvlyssup]

So for the BMR bushings I have the bushings that go in the mounts and then there is a steel sleeve that inserts around the bolt like the Steeda kit. Basically centering the bolt in the bushing.

I thought initially the steel sleeve was making contact with the frame of the car and was slipping off the bolt hole and causing my noise as well as my "shift". After shortening the sleeve it was not the culprit.

This is why I am at a loss. I will try and get a video of it but it honestly sounds as if there is something slipping against the body of the car and shifting the entire body as the wheels and tires stay in one place. If that makes any sense at all.

And then again it could be the Torsen. Cause it does not do it higher speeds. Only slow speeds. Let say 30 MPH or less. Car feels solid in the corners.

Maybe I didn't hear it or feel it when stock cause of all the slop in the stock bushings.

Mine was the opposite, zero noises up until about 700 miles then getting progressively more frequent & loud. Stopped for about 40 miles after the dealership tightened up some suspension hardware. They then swapped out the DS & the drivers side axle and all got quiet again for about 80 miles. I don't DD the car so noticed the noises coming back after the car sat for about 3 weeks. Decided at that point that the noise was probably normal Torsen click/pop/thunk coupled with sh!tty FORD components. Swapped a lot of stuff out and now it is pretty much quiet back there.

I have plans to couple the CB005 & STEEDA insert kit just in case my cradle is still off, even ever so slightly. You are welcome to the other part of the STEEDA kit if you wish just to try it out.

 

[Guard5.0]

So for the BMR bushings I have the bushings that go in the mounts and then there is a steel sleeve that inserts around the bolt like the Steeda kit. Basically centering the bolt in the bushing.

I thought initially the steel sleeve was making contact with the frame of the car and was slipping off the bolt hole and causing my noise as well as my "shift". After shortening the sleeve it was not the culprit.

This is why I am at a loss. I will try and get a video of it but it honestly sounds as if there is something slipping against the body of the car and shifting the entire body as the wheels and tires stay in one place. If that makes any sense at all.

And then again it could be the Torsen. Cause it does not do it higher speeds. Only slow speeds. Let say 30 MPH or less. Car feels solid in the corners.

Maybe I didn't hear it or feel it when stock cause of all the slop in the stock bushings.

Mine does it also. It has gotten worse or simply more noticeable with increases in power. It honestly feels like the car is planted but the body is still floating around. Mine also seemed to get worse with the lowering springs. Coilovers going on at Ridetech so I'm hoping they help a little along with the BMR stuff. I have decided that the car is a fat pig that's going to force me to replace the entire IRS before all is said and done.

Sponsored