How difficult is the 4R100 rebuild? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-26-2007, 05:28 PM   #1 (permalink)
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How difficult is the 4R100 rebuild?

I thought about trying to rebuild my tranny myself withthe help of a mechanic friend. Is it worth it or should I just pay to have it done? Also what is the best service manual for our trucks, I want one with detailed instructions and pictures.
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Old 07-26-2007, 07:59 PM   #2 (permalink)
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Re: How difficult is the 4R100 rebuild?

Pay someone to have it done.

It's easy to rip them apart, but putting it back together normally requires special tools.

I had problems rebuilding a th350, one of the most basic autos there is, I can't imagine what a 4r100 would be like.
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Old 07-26-2007, 08:12 PM   #3 (permalink)
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Re: How difficult is the 4R100 rebuild?

Go to www.atsg.biz. That is the automatic transmission service group, they have repair/rebuild manuals for lots of trannys, including the 4R100. I am thinking about finding a used 4R100 and getting a book and attempting to rebuild it. I can take my time and rebuild it rock solid and pay for it slowly. I was going to try and do my own but I couldn't remember where to get the book and I didn't really have time to have the truck off the road.

I'd say give it a try, if you have confidence in yourself you can do it, especially if you have a book that tells you everything. I have heard that the autos are actually very simple if you have a guide to follow, but I have never tried it.
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Old 07-27-2007, 10:52 AM   #4 (permalink)
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Re: How difficult is the 4R100 rebuild?

This mechanic friend. Does he have tools and knowledge of the 4R100? If so, I would try it. If not, I wouldn't
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Old 07-27-2007, 04:02 PM   #5 (permalink)
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Re: How difficult is the 4R100 rebuild?

Unfortunately my friend is a Dodge man, he works as a Toyota mechanic, but is pretty good at working on big stuff. The only Powerstroke he has worked on is mine though. He helped another buddy of mine rebuild a 94 Chevy transmission.
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Old 07-27-2007, 09:26 PM   #6 (permalink)
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Re: How difficult is the 4R100 rebuild?

im just about do everything but when it comes to trannys i wont rebuild them not becasue the scare me but because for one you need certain tools and second they are one big @$$ tranny for a pickup and i really dont want to be pulling it more than once. so a buddy of mine is doing my rebuild for me. but he works at a tranny shop and is really good with setting them up to be built tough. i mean really tough.
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Old 07-27-2007, 09:31 PM   #7 (permalink)
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Re: How difficult is the 4R100 rebuild?

Rebuilding trannys arn't that fun because one screw up and it won't work or you will burn the thing up in no time this is one thing I will leave to the pros like BTS or JW.
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Old 07-28-2007, 12:22 AM   #8 (permalink)
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Re: How difficult is the 4R100 rebuild?

[ QUOTE ]
Unfortunately my friend is a Dodge man, he works as a Toyota mechanic, but is pretty good at working on big stuff. The only Powerstroke he has worked on is mine though. He helped another buddy of mine rebuild a 94 Chevy transmission.

[/ QUOTE ]

Then the answer is "NO"
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Old 07-28-2007, 12:32 PM   #9 (permalink)
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Re: How difficult is the 4R100 rebuild?

Get the ATSG service manual on eBay. I see no reason why a guy with some prior trans experience couldn't rebuild one of these transmissions if you have the time. Just make sure you really trust your buddy, you need a VERY clean place to work. Use no red rags (no cotton lint ball infested rags) and you both read that service manual about five times each before starting. Lots of great aftermarket parts out there for these trucks.

Keep in mind, on this board the 4R100 is regarded as some sort of mystical beast. Around here if you ask for help with the simplest of 4R100 problems the only answer you will be given will result in a "have it rebuilt by BTS" answer on this board.

Parts is parts, they aren't magical...
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Old 07-29-2007, 05:23 PM   #10 (permalink)
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Re: How difficult is the 4R100 rebuild?

Piece of Cake....................................If your name is
Brian and you work in Lead Hill, Arkansas.
Ive seen the inside of these trannys, I am very mechanically inclined,
I wouldnt touch it if Brian live next door to me and he was my best
buddy.
I dont like paying for anything that I can do myself. And I usually
do not, But this is one I leave to ( and pay) the pro's to do.
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Old 07-29-2007, 07:08 PM   #11 (permalink)
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Re: How difficult is the 4R100 rebuild?

Here's a link to a write up on a e4od rebuild. http://www.[censored].com/projects/e4od/index.htm
Similar transmission so it should give you and idea of what you're up against if you do decide to do the work yourself. Looks to me like it is do-able as long as you pay close attention and keep things clean. There are a couple of special tools that you need but I suspect a person could come up with those if you really wanted to. The biggest advantage I see in having BTS or Woods do the work is you know it will be done correctly, including any thing out of the ordinary that should come up during the rebuild. It's always the unexpected things that get you into trouble and the experience these guys have is worth a few extra bucks. Be sure and keep us informed if you do decide to go ahead on your own. There is a lot of interest in upgrading these transmissions and it would be interesting to see how a "non pro" does on a project like this.

Good Luck
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Old 07-29-2007, 09:54 PM   #12 (permalink)
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Re: How difficult is the 4R100 rebuild?

I am looking to preemtively attack this as well, I want to start connecting with people because we aren't the first that want to attack this problem. If we work together and post results and lessons learned then the next person that comes along will not be dismayed by people saying to buy certain brands and stem their curiosity.

Just my two cents, post lessons learned on webshots and post results and questions here on the forums.

Good luck
Jeremy
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Old 07-29-2007, 11:50 PM   #13 (permalink)
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Re: How difficult is the 4R100 rebuild?

i rebuild these trans all the time at the dealer and for friends ,to me they are easy but you will need some special tools to compress the o/d cylinder down
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Old 07-30-2007, 12:17 AM   #14 (permalink)
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Re: How difficult is the 4R100 rebuild?

[ QUOTE ]
Rebuilding trannys arn't that fun because one screw up and it won't work or you will burn the thing up in no time this is one thing I will leave to the pros like BTS or JW.

[/ QUOTE ]

Ditto, One mistake & your doing it again. Then you may as well have had someone who looks at them every day do it.

I'm a certified Tech, owned my own shop for years before selling it to the local Ford dealership in Mich. I've had many auto's apart & I had Brian do mine.

A friend on here, Mark. Was a trans rebuilder for years, & had Brian do his magic. Why, because the same reason. Brian only specializes in the Ford trans & could likely do them in his sleep.

The reason so many say to have Brian do it, is because of his warranty & service to his customers. With those standards, why even mess with it?

As Brian assembled my trans, he explained the special goodies he does as extra, some of these things I could NOT have easily bought in a kit to do myself. Therefore I was paying for his years of knowledge, which as a Tech, I value.
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Old 08-02-2007, 12:17 PM   #15 (permalink)
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Re: How difficult is the 4R100 rebuild?

Common sense is all it takes to rebuild anything little skill and some good American know how. I rebuilt my e4od in the garage. Only purchased one tool. About 5 feet of 2x4 a small piece of 3/16 plate steel and that was it. I came in about 1500$ cheaper then a BTS and I would bet its no different if not better inside. I know I have a better converter.
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