I would if I was running a factory setup. 

 

But given the ims unit runs rubber bushes and channels the torque reaction from the diff into the two rear mounts I don't see the need for poly in the front. 

I know the BAs run a factory solid front side diff bush.  Will these fit BFas well. To me those voids are Inbuilt cracks just waiting to tear 

Edited October 12, 201610 yr by arronm

Im not sure you can still source the steel shell BA style bushes?

apart from the extra cost over the OEM bushes, are there any downsides to using the superpro bushes instead?

Stiffness equals vibration or noise possibly.

There was a guy on facebook the other day that still had axle tramp with this kit cause he used standard Ford front bushes.

The front needs to be as stiff as the rear to stop the diff rotating both ways under power.

I have felt a small amount of tramp a couple of times with mine, when it's wet and it's on the limit of grip.  Pretty sure it was tramp anyway...was that rapid hitting feeling coming from the rear.

 

I had brand new stock bushes put in there after the mechanic requested that to ensure precise fitment.  My kings/koni suspension is probably coming up to about 175,000km old though so not sure if that would be contributing.

20 minutes ago, gaz097 said:

Stiffness equals vibration or noise possibly.

There was a guy on facebook the other day that still had axle tramp with this kit cause he used standard Ford front bushes.

The front needs to be as stiff as the rear to stop the diff rotating both ways under power.

What shocks/spring/tyres/power level was he running? 

No idea.

I varied all them like 20 times to no effect of irs diff wind up.

Once I stiffened up that diff, all was sweet.

My very first rear end setup , fitted by Ford was standard side bushes, with a 100% solid centre bush.
I have never felt diff thud so bad in my life

I have the CAT600 front bushes in mine. Absolutely no difference in road noise over the standard bushes. Personally, I think that having the stiffer front bushes are a benefit  and provide torsional stiffness in the IRS frame. My like the aftermarket engine mounts benefit the front end.