Thnx you guys!
Okey so i keept going with the rear end this time.

You can se wich one who´s got the most "activity" right now
Iv´e planed to run on a Scorpio Cosworth rear end with a welded 7,5" diff.
The benefits are many the way i se it.
The axel is bigger and seems more steady then the stock from Sierra.
It also has bigger bolts to the hubs wich was a problem last year.
I manage to cut off many of the old ones after all driving.
It also has bigger driveshafts
The Cosworth V6 is based on the stock Ford V6 called cologne.
It has other pistons from Mahle and the block itself is reinforced by cosworth

The standard cologne 12v cylinderblock

The 12v

The Cosworth engineblock
Some other pics

Hehe "dä bara spinner, wooootschhh!!!"