4 spd tranny ?
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4 spd tranny ?
my 86 f 250 has a 4 spd tranny with a granny 1st. the code on the door is "p". but in the owners manual it doesnt specify which tranny i have. i am trying to find out if anyone knows the gear ratios of the "p" tranny.
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From: Sierra Vista Az
Most likely its' a Borg Warner T-19, New Process made a tranny for these trucks as well but very rarely seen. I don't know what the gear ratios are except for 4'th. It is a 1:1 ratio so no overdrive.
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From: Coutts Canada
The 435's were used quite often, but an easy way to tell is if you can shift it into first gear while moving then its the t-19, if not then its either the T-18 or NV-435, then if you can stick a magnet to the case (i think this is right) then its a T-18., but there should be a tag on one of the sides of the tranny.
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is there any mathmatical equation to figure out what each gear ratio would be with the rear diff ratio. i hope that makes sense. i am thinking of going to 3.55's or even 3.08's. this truck wil be my daily driver.
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If it were my truck, and used for daily driving...highway, I'd go to a lower numeric rear end than a 3.08. If you had something like a 2.73 then your first thru third act like a regular tranny, unlike a granny, and fourth turns into a highway overdrive.
Now stand back cause you're gonna hear alot of grunts and groans over this idea.
My advise: think for yourself.
Here's a starter for you to do some math.
The fourth gear in a non-overdrive tranny turns 2300 rpm at 60 mph with a 3.08, 2650 with a 3.55, 2050 with a 2.73, 1850 with a 2.47.
If an overdrive fourth, multiply each rpm by .71.
Pick your poison.
I have the overdrive with 3.08, so I cruise at 1633 rpm at 60 mph.
I don't do heavy pulling, but I have, in such cases I just use third gear...that's equivalent to fourth gear in a non-overdrive unit.
Now take some aspirin, settle in with a calculator.
Now stand back cause you're gonna hear alot of grunts and groans over this idea.
My advise: think for yourself.
Here's a starter for you to do some math.
The fourth gear in a non-overdrive tranny turns 2300 rpm at 60 mph with a 3.08, 2650 with a 3.55, 2050 with a 2.73, 1850 with a 2.47.
If an overdrive fourth, multiply each rpm by .71.
Pick your poison.
I have the overdrive with 3.08, so I cruise at 1633 rpm at 60 mph.
I don't do heavy pulling, but I have, in such cases I just use third gear...that's equivalent to fourth gear in a non-overdrive unit.
Now take some aspirin, settle in with a calculator.
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Yea, I guess by its very nature, the larger rear ends are built to be strong, intended to do some heavy work rather than acheive good mileage on the highway.
Ford knew they had an engine that had the potential to give good mileage (for a pickup) by having the inline six. In the early 80's, they mated the overdrive transmissions to it, pumped up the tires, slapped an "overdrive" placard on the tailgate, and went to selling 20+ mpg pickups. At the time, I bought some rural land I knew I wanted to drive out to on weekends, 35 miles out, so I was a good candidate....a pickup box for utility....impressive fuel mileage. Still drivin' her!
Ford knew they had an engine that had the potential to give good mileage (for a pickup) by having the inline six. In the early 80's, they mated the overdrive transmissions to it, pumped up the tires, slapped an "overdrive" placard on the tailgate, and went to selling 20+ mpg pickups. At the time, I bought some rural land I knew I wanted to drive out to on weekends, 35 miles out, so I was a good candidate....a pickup box for utility....impressive fuel mileage. Still drivin' her!
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