Thread: Improve gas mileage on a 427 so ?
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Old 02-24-2020, 11:58 AM
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MKS427 MKS427 is offline
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Location: Glendale, AZ
Cobra Make, Engine: FFR MkIV 427
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Eric,
I did see the idea of going to a 6 speed thrown out there.
If you are running a 4-speed TL a Tremec TKO-600 w/wide ratio OD may be a good solution. The lower gearing is different, so the ring and pinion will most likely have to be changed.
FYI: 351W based 427 Dart (tuned as far as pump gas will allow) 572/582, EFI, TKO-600 WR OD, 3.08 gears, 25.4" tall tires. 2000 rpm @ 80 mph in 5th gear, gets 15 mpg combined getting on it/cruising.
With 26.5" Billboards, TKO-600, and 3.27 rear gear would net about 50 mph/80 kph @ 6000 rpm in first.
Last edited by MKS427; 02-24-2020 at 12:00 PM..
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