I've never driven a 4 speed b210, but compared to auto, there is a night and day difference. That OD definitely is nice. Even with the 3.889 auto rear instead of the 3.70 the 5 speed originally would have, I cruise at like 3600 on the interstate. Far cry better than the 1:1 in the auto, being well over 4000 IIRC. And closer ratios with the 5 speed is nice too when you have so little torque to work with.