4R100 questions
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Freshman User
Joined: Jul 2007
Posts: 37
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4R100 questions
So, I am thinking about doing a supercharger system on my 03' F250 5.4l and I want the tranny to be able to handle the upgrade. I see that I can buy a new valve body for better shifts and Banks has a programmer for the transmission. Are there any better options and can I combine both of those kits?
Elder User
Joined: Aug 2006
Posts: 557
Likes: 1
From: Bristol, CT
I Really got you thinking about a Supercharger for the truck eh? The 4R100 is already a strong Tranny. You got to remember, they used it on the 7.3L in your year and that was putting out 500 lb.ft of torque! With the blower your going to be displacing alot less. So i say leave her be. If you think the tranny will need a little help and you want to use a new valve body, since your dropping the pan why don't you Replace it with a bigger one and use some Synth ATF (Mercon/Mer5 Rated). It will help keep those temps down. As for the 4R100, i have a Great amount of trust in her.
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
Originally Posted by ccerniglia
The 4R100 is already a strong Tranny. You got to remember, they used it on the 7.3L in your year and that was putting out 500 lb.ft of torque! With the blower your going to be displacing alot less. So i say leave her be. If you think the tranny will need a little help and you want to use a new valve body, since your dropping the pan why don't you Replace it with a bigger one and use some Synth ATF (Mercon/Mer5 Rated). It will help keep those temps down. As for the 4R100, i have a Great amount of trust in her.
they also like clean fluid
Elder User
Joined: Aug 2006
Posts: 557
Likes: 1
From: Bristol, CT
Originally Posted by rbaker6336
the 4R100 and torque are actually a weak piece behind a 7.3,I would do at least a valve body and cooler
they also like clean fluid
they also like clean fluid
I Can Tell you that there were never many 4R100's from 99-03 with a 7.3L in front of her that came throught this shop on Warranty or Customer Pay Repairs, and thats why i place my trust in her. Once again, he'll be putting out alot less Torque.
"kbeefy" Your Right, But the Extra fluid helps alot.
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Elder User
Joined: May 2007
Posts: 936
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From: Carlos, MN
I would think a BTS valve body and you should be fine, also you may want to add a bigger tranny cooler, if your going to be doing a lot of towing.
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Tuned
Joined: Aug 2003
Posts: 278
Likes: 0
Having replaced the first 4R100 at 40k miles, and just rebuilt the 2nd one at 99k miles I would agree that it is the weak link. However, recently installed tranny temp gauge suggests I need more cooling and maybe a better fluid. I run Mercon now. Is the Mercon/Mer5 different or better? Where do I find it, and how does one classify tranny fluids by their heat removal abilities?
