Quote:
Originally Posted by talkingcars
It would be easier to drop engine and box in one go and unless you want a car that runs high revs at cruising speed, uses more fuel and has a misreading speedo you'd be better off with the box and engine matched.
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No that's wrong advice.
Final drive is 3.9 on the 120 box and 4.2 on the vvc box. Cruising speed revs would be lower. Also speedo will read the exact same as you aren't changing the speedos gear ratio. The plastic gear is the same on both boxes.
Also most economical way of swapping those engines is leaving gearbox and shafts in car.