[piecesparts]

If you had a 700R4 with a 3.42 rear end, like my 91 Silverado has, you would end up with RPMs depending on your tire size. I just played this game with tire sizes and the calculation numbers below came out real close to my actual RPMs. The output trans ratio on my engine calculated out to be at 0.7426, due t o the overdrive, where a 350 would be at a ration of 1.0.

60 MPH 28" tire= 1824 RPM 27" tire= 1896 RPM

65 MPH 28" tire= 1977 RPM 27" tire= 2054 RPM

70 MPH 28" tire= 2128 RPM 27" tire= 2212 RPM

75 MPH 28" tire= 2281 RPM 27" tire= 2370 RPM

I run a 700 R4 tranny in my 84 GMC Sport truck with a 3.73 gearing and 27" tires ---I get 2500 RPMs at 70 MPH and 2700 RPMs around 75 MPH. This works well for my truck because it allows me to drive comfortably and accelerate strong. This also allows my cruise control to operate and not have to overwork itself in any hilss or grades. My Son's truck has the same setup and it works well in his truck also. He had a 3.08 gearing with the 700R4 conversion and it sucked gas hard, because the motor was always working to catch up to the load.