rpm shift point?????
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New User
Joined: Jan 2009
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From: Texas
rpm shift point?????
any body know what the rpm shift points are on the 5 speed manual 4.9 i just put a tach in and it seems like its reading low 2000 rpms on the tach sounds like 5000 in the cab
Elder User
Joined: Oct 2006
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From: stinkin lincoln, maine
sounds right....
Did you get a 4-6-8 cyl selectable tach? And if so, is it set for a 6-cyl?
I had a 390 that would turn up like it was on nitrous spinning on wet grass, only to find the tach was set on 4-cyl.....oops.....
Did you get a 4-6-8 cyl selectable tach? And if so, is it set for a 6-cyl?
I had a 390 that would turn up like it was on nitrous spinning on wet grass, only to find the tach was set on 4-cyl.....oops.....
More Turbo
Joined: Sep 2003
Posts: 630
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From: Northeast
9Power,
It's supposed to sound like that (like a "moaning" six--that means it's happy--LOL). That's assuming you don't have the fan clutch issue Conanski mentioned.
What is your rear axle ratio? My '88 F-150 2x4 4.9 has 3.55 rear gears in it, and I shift at 2,500 if I'm actually accelerating into traffic with some vigor. If I'm just coasting along in town, I may shift it at 2,000 or less. That's if there's no real load on it, that is.
If you're shifting at 2,000 rpm, then your an even more-conservative driver than me, and I thought I was bad! LOL My father had a construction company for years, and he ingrained in me this thing about not needlessly revving stuff. Although I like to "get on" a car now and then, I find myself not revving truck engines, especially a "long stroke" torque-monster such as the 4.9.
Mine idles where yours does, too, btw.
It's supposed to sound like that (like a "moaning" six--that means it's happy--LOL). That's assuming you don't have the fan clutch issue Conanski mentioned.
What is your rear axle ratio? My '88 F-150 2x4 4.9 has 3.55 rear gears in it, and I shift at 2,500 if I'm actually accelerating into traffic with some vigor. If I'm just coasting along in town, I may shift it at 2,000 or less. That's if there's no real load on it, that is.
If you're shifting at 2,000 rpm, then your an even more-conservative driver than me, and I thought I was bad! LOL My father had a construction company for years, and he ingrained in me this thing about not needlessly revving stuff. Although I like to "get on" a car now and then, I find myself not revving truck engines, especially a "long stroke" torque-monster such as the 4.9.
Mine idles where yours does, too, btw.
Elder User
Joined: Sep 2005
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From: Standish ME
Don't mean to hijack the thread but... How is an easy way to see if the fan clutch is seized? my buddy thinks mine could be but i dont want to go replacing it if i dont have to. Are you supossed to be able to just spin the fan with your hand when the motor is off? thanks again and sorry for
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Fleet Mechanic
Joined: Mar 2005
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From: St Louis
Don't mean to hijack the thread but... How is an easy way to see if the fan clutch is seized? my buddy thinks mine could be but i dont want to go replacing it if i dont have to. Are you supossed to be able to just spin the fan with your hand when the motor is off? thanks again and sorry for
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New User
Joined: Feb 2006
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From: Chelsea, MI
That sounds about normal for the big six. I usually shifted between 2000 and 2500 rpms, and yes it sounds like it's spinning a lot faster, just the nature of the beast I guess. Spin it up to 3500 or 4000 one time if you really want to hear it sound like it's gonna explode, sounds awesome with a 3 inch open exhaust though 
Post Fiend
Joined: Jan 2007
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From: Almost Heaven
That sounds about normal for the big six. I usually shifted between 2000 and 2500 rpms, and yes it sounds like it's spinning a lot faster, just the nature of the beast I guess. Spin it up to 3500 or 4000 one time if you really want to hear it sound like it's gonna explode, sounds awesome with a 3 inch open exhaust though
Senior User
Joined: Apr 2008
Posts: 448
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From: Iowa
I usually shift at 1800-2000 empty, and if I get on it I out-accelerate most traffic. Towing I shift at 2500-3000 depending on how heavy the load is. By my '91 dies out right at 3000 when my '90 will pull well past that.
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