Why is that?
If I remember right, the auto s197 mustangs came with 3.15’s and used the same rear end as the f150.
The 10r80 starts to slip around 750-800hp in 7th (1:1).
As dusten mentioned there are 10r upgrades starting to come available now.
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Beats me.
Ford f150 is 3.31,3.55 and 3.73.