BMW Suspension/Transmission Transplant Kit
Complete BMW 3-Series Rear-End Transplant. Utilises a modified 3-series cross-member and bolts straight up to the Stag bodyshell. Price includes new GKN propshaft and new rear springs. Will require new wheels to compensate for wider track. nb. signed disclaimer required for this item. Diff rear mounting plate required in exchange (Rimmers part no. 311268).
Monarch has developed a bolt-on rear suspension and transmission kit for the Stag, using robust and reliable BMW components, which allows the use of much more powerful engines and modern wide low-profile tyres and wheels with suitably wide rims. This is made possible by virtue of the vastly reduced camber change geometry of the BMW rear suspension. You simply buy a complete rear end secondhand then send us the beam , trailing arms & stag diff backplate which we then modify and bolts straight up to the Stag bodyshell using the standard mounting points. There are several other advantages of fitting this kit as you get the whole BMW transmission train, (ie. the indestructible BMW diff & driveshafts with the wonderful BMW constant velocity U/Js), hubs and disc brakes as well as the chance to have those 225/50R16 tyres you always wanted on the back. With this kit you also get a brand new GKN propshaft and new rear springs. So in buying this kit you save the cost of having to buy my "standard" BMW Diff Conversion (which uses the Stag rear subframe) new driveshafts AND a rear disc brake kit conversion as these are all included with the new set-up. You will of course need new bigger wheels with much more offset to accommodate the wider track which I can also supply from Image, with BMW wheel stud PCD to fit the new hubs and different rear shocks. These are not included in the price. But the whole point of fitting this new rear end would be lost anyway if you kept your standard Stag wheels. I can modify the stud PCD of your front hubs to match so that all your wheels have the same stud PCD, or you could go the whole hog (and why not?) and fit my aluminium hubs which use bigger bearings and spindles and weigh HALF as much as the standard steel hubs. Less unsprung weight improves traction and handling. Also now available is my more powerful aluminium 4-pot caliper/ventilated disc/aluminium hub kit which uses bigger calipers (too big to fit inside standard Stag wheels).