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11-23-2019, 12:37 PM
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,698
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Re: 78 K20 towing with 454
With your current setup (4.10ratio,,31.6tall tire,,1:1trans,,75mph)..your turning around 3270rpm at 75mph
Gear swap sounds like it's in order....or get a 4l80 trans and have the best of both worlds...low ratios and od....the od would get you down to 2289rpm at 75mph Bad part of gear swap is cost x2 for a k series.. Heres a rpm calculator thatll help you....http://www.csgnetwork.com/multirpmcalc.html
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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