I am building a Marlin Cabrio which uses a standard 7" Sierra diff (mine is the 3.38 ratio), and makes use of the original rear rubber D bracket. Having just got the engine fired up (BMW M50 2.5), I can now see how much this will allow the diff to contra rotate - the prop flange must move 2" just letting the clutch out to spin jacked up wheels. So when they are firmly planted it will be much worse.
I have looked at ways of reducing this rotation, and see two options. One is to use a polybush version of the D bracket, but guess this will be very stiff, and probably noisey, and suffer lots of vibration.
The other is to swap from my Sierra 7" to a late Scorpio 7.5" diff with Koala back plate and the double rubber enclosed bushes: I believe the 2.5 diesel had a 3.36 ratio). This looks like it would greatly reduce the possibility of roataion, yet should help dampen the vibration/noise down.
All good in theory - has anyone any experience of the Scorpio diff with the koala rear mount?
regards
Mike
17 Jan 2012, 9:54pm