HI there
So today I made a start on improving the rear-end of the car. Though the car drives great as I already mentioned in my more detailed review it can get floaty and when you do power oversteer from a corner, though it is progressive and controllable, there is a floaty sensation coming from the rear.
So today I started by installing BMR Vertical Delrin/Spherical links, these are advertised as helping reduce deflection and wheel hop with no added NVH.
Removing the old ones is very easy, wheel off, undo the 18mm bolt and undo the 15mm bolt, they comes right off. To make my life easier I had a jack under neath the rear hubs to support it so once I removed the vertical links all remained in place.
Stock vertical link VS BMR vertical link
The first thing you can see is the BMR looks a far more solid and stronger item compared to stock. Yet it weighs less due to being made from billet and is vastly stronger and uses much larger bushes that fill the entire space.
I used energy suspension lube everywhere as I had heard of some people getting knocks/clunks after vertical link installations, but those were delrin/delrin version and I had gone with spherical/delrin to help eliminate any noise/NVH.
The instructions say put the supplied top bolt in first and then the original stock bottom bolt. Doing it this way round meant I could not line up the bottom bolt to go all the way through and instead of using pry bars and going wild. I removed the top bolt to give me some more wiggle room for the bottom bolt, worked and the top bolt went straight in. Top bolt tightened to 81lb/ft and bottom bolt to 129lb/ft and used blue loctite on bottom bolt for safety, no need on top bolt due it using a nylock nut.
Test Drive
First thing, no knocks, clunks and zero added NVH, to drive the car feels hardly any different. But putting power down in 1st gear, wheel hop is reduced, the wheels just spin instead with less hop/judder, but have to say grip seems improved. Power oversteer feels more direct and the car feels more planted in the rear. Were talking all minor improvements in here, but a change for the better indeed and again at £100 cost they are well worth the price.
Picture of one installed:
Set aside 1-2hr for install!
So then it was time for the Steeda differential bushing insert kit. When accelerating hard, especially if you get wheel spin the whole differential bounces around in its housing and typically give a bit of a sloppy feeling, it also no doubt contributes to the rear end bounce a little as well and wheel hop.
These are very easy to install, first just support the differential with a jack, then undo the two rear subframe bolts by about 2-3 full turns. Now undo the bolts in the rear differential, one at a time. Put the bushing insert into the void, it will only fit one way and then re-tighten, getting a socket on is hard due to lack of room, so a 22mm and 18mm spanner is very handy. Re-tighten to 129lb/ft and also re-tighten rear subframe bolts also to 129lb/ft.
The front differential bushes are a little harder, you need to support the rear subframe with a jack and remove the front differential bolt on one side at a time. Then remove the bolt and replace with a shorter bolt. Then insert the bushing insert on the opposite side using the short bolt.
As this is a fiddly job it will take you anywhere from 2-4hr in driveway.
These bushes fill the void and help prevent the differential having excess movement, keeping it under far more control. The kit comes with red and black bushes, black being firmer, I went with red ones as again they claim no added NVH.
Picture of an insert installed and one not:
You can see that the stock rubber bushing allows the differential to have a lot of movement, no doubt for comfort, but it does no favours for control and wheel hop. These kits cost around £70 so are great value for money!
Test drive with BMR Vertical Links & Steeda differential bushing insert system
Now things become more noticeable, but not in a bad way, ride comfort is practically as it was and again there is no added NVH, something I am very sensitive too.
These two combined together and really got rid of a lot of the rear-end slop and rubberized feeling the car had. To be frank the car feels bloody awesome now in the rear with just these simple modifications, it is far more direct, the car just feels a lot more sharper whilst still also being the great tourer as comfort and ride quality is un-changed. If anything for me it feels better as the car feels a lot more connected, it bounces less, wheel hop is practically all but gone and power oversteer now the rear-end no longer feels like it is floating and if anything the car is more controllable on the throttle.
These pair of modifications together are superb, if you also feel your Mustang feels a bit rubberized and sloppy/bouncy in the rear and you have wheel hop and/or traction issues. Well give these parts a try because they reduce all of those symptoms.
This car just keeps getting better and better!
Monday I am going local garage to get the springs and dampers fitted, plus an alignment.