Speed and MPH
My 407 at 5,000 revs would be about 125 mph
At Le Mans I did red line it on the Mulsanne Straight and the 137 recorded seemed about right.
At 5000 revs in 2nd gear, I have not tried it! I suspect would be about 70mph.
Tyres should be 6.00 x 16.
Trans ratios on the 407 Low 8.1, 2nd 4.8, Top 3.31,
According to the Motor Road Test of the 407 they gave a max speed of 129.00 mph.
The recommended engine speed limit of 5,100 revs in top gave 122 mph.
Max speed in 2nd gear 70mph, max speed in 1st gear 36mph.
I strongly suggest that if it is reving at 5,000 revs giving an indicated 70mph that it must be stuck in 2nd gear!
Hope this helps, though I doubt it!!
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