I just got my 2000 F150 4X4 5.4L pickmup so I'm new to this message board.

What is the best streetable High Stall Speed Torque Convertor for the late model F150 5.4L?

I don't even know the model number of the AutoTrans so I don't know if this enhancement is ever done for the F150.

 

Considering the RPM range and power band of the 5.4, you may not want a high-stall unit; heavy duty on the other hand may be a good idea depending on how hard you play. Try contacting Precision Industries at: http://www.converter.com/
They seem to have the Ford torque converter situation as well in hand as anyone.

 

If you plan to do any heavy towing you don't want a high stall converter. Just too much slippage causing the rpm to go high and waist fuel. It is difficult to accellerate without a lot of throttle with a loose converter. Your engine will feel like it is struggling. Also transmission temperature will run higher particularly in hot weather.

Now if you don't plan to tow then a converter will really improve accelleration. Precision Industries is the converter to buy if you do get one.

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97 4.6 F150, 1/8 = 10.885 @ 64.10 mph, 88 5.0 Mustang 1/8 = 7.191 @ 94.76 mph

 

I have just purchased a 9.5" 2500 stall from Precision Industries it will be installed this Friday they guarantee 40-50 Hp at the wheel they also claim driveability will be normal under light throttle.

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Mods:K&N Intake,
3"Flowmaster,
Transgo Shift Reprogrammer
Dyno:268.6HP, 309.8TQ
4R100 TRANS
9.5" Converter 2500 Stall
Micheline 275 75 R16
Heavy Duty Rear W/355

 

Stewdog: Do you know what your current torque converter's stall speed is?

Will you be maintaining the torque converter lockup?

Where/how do you expect the added HP?

Tks,

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Y2K™

XLT SC SB 5.4L 3.73LS

 

Stall speed is not everything in a TC.
The multiplication factor which affects power transfer is at least as important.
Smaller diameter TC with the same stall speed can have a higher multiplication and a higher max rpm. Stall speed will maybe help when towing heavy loads to get the motor rpm up in the power band when starting out, but at cruise and hills it has no effect.

BTW, 2800 rpm is about the max for streetability on these heavy beasts.

Birdman

[This message has been edited by birdman (edited 05-02-2000).]

 

There is a definate big differences between the two converters. I believe factory specs for my converter are: Diameter 12.25", Stall between 1500-1800, Multiplication 1.9-1.
New converter: Diameter 9.5", Stall 2500, Multiplication 2.53-1. The lockup stays the same as factory. And their claiming 40-50Hp increase at the rear wheels. I will see this evening.

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Mods:K&N Intake,
3"Flowmaster,
Transgo Shift Reprogrammer
Dyno:268.6HP, 309.8TQ
4R100 TRANS
9.5" Converter 2500 Stall
Micheline 275 75 R16
Heavy Duty Rear W/355

 

Stewdog,

Definitely let us know how it feels to you.

Even better if you have any before/after dyno runs.

 

The smaller-diameter converter will allow your engine to spin-up faster -- and the lower inertia will let you spin your engine faster (chip-it to get that).

 

Well guys i'm still tring to fill this thing out but first impression is nice. If you barely mash the gas it takes off normal but if you mash it harder it fill like you are pulling a load. But when you mash real hard it runs like a bat out of hell. As a test I ran a new mustang last night it must have been a six cylinder with the tail and ground effects option. Anyway we took off I pulled it out of the hole by half a truck. I was still in first they shifted to second, at this point two lengths ahead then I shifted to second and shut down. So something is happening here. Gas hasn't changed much but it is really to early to tell. I will keep you posted.