Optimal RPM's
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Joined: Feb 2004
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From: md
Optimal RPM's
Pardon the question if it sounds stupid, but I am wondering what the "optimal" rpms should be for my truck when idling warm and at 65 mph on the highway in 4th?
I have an 86' f-250 4x4 with a 351w, 4 spd manual n/odrv, 4x4 with 4.10 rear
Thanks for your info!
I have an 86' f-250 4x4 with a 351w, 4 spd manual n/odrv, 4x4 with 4.10 rear
Thanks for your info!
Senior User
Joined: Oct 2003
Posts: 418
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From: Nice, California
I am not sure but in my truck, I have a 1980 F100, with a inline 6 cylinder 300ci, 3 speed column shift, and in 3rd at 65mph my rpm is at 2300.
I don't know if it's similar to a v8, but could be close.
I don't know if it's similar to a v8, but could be close.
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Joined: Jul 2002
Posts: 1,147
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From: East Coast
Idle speed should be around 600-800 RPMs. At speed, with a 4:10 rear and No overdrive you're really gonna be singing, probably above 3K RPMs
My truck has a 302 with 3:55 gears and OD, if I leave it in 3rd (high) at 50 mph it's at about 2200 RPMs. In OD 50 is about 1700 RPMs
My truck has a 302 with 3:55 gears and OD, if I leave it in 3rd (high) at 50 mph it's at about 2200 RPMs. In OD 50 is about 1700 RPMs
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