Quote:
Originally Posted by Baime
Jacko,
I am a little disappointed that the highway rpms are not lower if I stay with the TH350 transmission, and change the 4:10 gears to 3:54.
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I think you may be misreading the chart - staying with TH350 and swapping rear from 4.10 to 3.54 will absolutely drop highway rpm. (2713 to 2330 at 65 mph for comparison). Drops it by almost 400 rpm.
It does so at the expense of bottom end torque multiplication though (10.33:1 final drive changes to 8.87:1 - so less accel off the line). Not "that" noticeable, unless your favorite passtime is doing burnouts. I'd say the highway rpm reduction is worth the tradeoff. Keep in mind, it's ALWAYS a tradeoff, unless you upgrade to an overdrive trans - doing that (without changing the rear gears) normally means increased acceleration and decreased highway rpm because of the additional gear allowing for a more optimal spread.