No LSD unfortunately. An aftermaket Quaife unit will cost up to $2,000. The original diffs are OK but you can put the rear of a Capri in if you want a stronger diff and bigger rear brakes. The front brakes on the Capri and RS use the same size pads so no real benefit there. The Capri GT 3000 diff has a 3.22 ratio so is better for economy once you do the motor up. Also you can bolt the Sierra 5-speed box straight in to get overdrive - all the other ratios are unchanged. With mine I chose to use a Supra alloy case as they are lighter and have a lower 2nd gear. Takes away the big gap in the Ford box between 1st and 2nd.
Fuel injection is possible but will cost a motza. If you are plannig to turbo it I would go for straight LPG. Much cheaper for initial setup and also ongoing fuel costs.
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