need advice fast help please
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Senior User
Joined: Dec 2003
Posts: 109
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From: Farm
need advice fast help please
Ok I just bought a 66 f150 with 390 gears and a 352 would this be too steep of a setup to drive 1200 miles on the interstate would that make the engine crank to much help me out guys!!
Posting Guru
Joined: Jan 2002
Posts: 1,836
Likes: 3
From: Elizabethtown, PA
I'll be the dissenting vote and say it will be cranking some RPMs on the highway, which will not help your mileage any.
Getting a lower ratio rear shouldn't be hard. Most V8 F100's came with a 2.73 to 3.08 or thereabouts ratio. Certainly easy enough to swap around. Cruising speed in mine thus equipped is 65-70 mph and gets 12-15 mpg.
Getting a lower ratio rear shouldn't be hard. Most V8 F100's came with a 2.73 to 3.08 or thereabouts ratio. Certainly easy enough to swap around. Cruising speed in mine thus equipped is 65-70 mph and gets 12-15 mpg.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Neil, It'll handle 60-65 no problem, thing it you might want to talk to your personal banker before you start out . I suspect about about $200.00 just in gas for the trip. The old F350 duallys used to run those rpms so you'll not have any problems.
I never heard of 390 gears though. The 352 sd mostly had 3.25 and the 352 autos 3.00.
Hope you have a safe trip.
John
I never heard of 390 gears though. The 352 sd mostly had 3.25 and the 352 autos 3.00.
Hope you have a safe trip.
John
