right - 'highway speed' of another era. my '60's' cj5 had 5.10s with a saturn od and it was still a screamer at highway speed. i'm not driving it yet, but i have a '50 216 3100, and guessing that it has a 4.10. closed of course. but the 4.10? is coming out, and the open '55 3.90 is going in. i got the '55 and the straight front for $100. the 216 is also coming out and the 235 is going in