a low ratio diff such as 4.14 makes it much easier for the engine to turn the wheels. But it takes more turns of the engine to spin the wheels - Less top end speed but easier to get there ( better acceleration )
a high ratio diff such as 3.14 makes it much harder for the engine to turn the wheels. But it takes less turns of the engine to spin the wheels - more top end speed, but harder to get there ( worse acceleration , may never actually achieve to speed ).
Sierra engine bay wiring is all on a seperate loom, the wires to feed this this loom on a 1.6 carb car are almost identical to a 2.9 EFi v6. So instalation is almost the same.
Auto's can be used, but if you want to swap to manual then you may pay through the nose for a gearbox on its own.
TT
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