the 620ti box has the same ratios and final as the zs-v6, so 5th gear will be the same
The 220 tomcat had long ratios with a 3.6 final drive, much like diesel ratios but that would be revving much lower at 70mph
215/45/17 tyres with the standard ZS ratios does 69mph at 2800rpm in 5th, with speedo inaccuracy it could read 75mph or 70mph with a 215/40/17, as tyre dimensions vary wildly from the numbers they claim, you can include many 205's in the equation also.
Sounds like a 620ti box which is the same as the V6 box but with a diff and new uprated bearings which is a nice touch.
Did they also replace the upper bearings too?
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