Still on the fence between a 3.73 and 3.54 in a new S60. Currently have a BBC/400th in my 69 Camaro but hope to eventually go LS with overdrive (auto), about 450hp. Thinking the 3.54 may make the big block a little more driveable in the meantime but will it be enough after the swap and work well with the OD? Street driving only with some highway time, 26.5" rear tires on this car. Any opinions??

 

This falls into an area of personal opinion. I would go with the 3.73 and never look back. Once again that is what I would do not necessarily what would suit You.

Hope this is what You wanted for a response?

Carl

 

I have 3.54 in mine, and at 65 MPH it cruises around 2000 RPM in OD with an auto trans. The 3.73 won't be much higher than that.