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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.

Thread: Need help with 4r100 Reply to Thread
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  Topic Review (Newest First)
05-07-2019 05:48 AM
Howard Avery
Quote:
Originally Posted by ArcticDriver View Post
Keep an eye weekly on that engine oil level until you figure out why it was low.

Its not uncommon for it to be down 1-2 quarts between oil changes but it could be a symptom of something else.

Will do. thanks for the info.
05-05-2019 07:50 PM
ArcticDriver Keep an eye weekly on that engine oil level until you figure out why it was low.

Its not uncommon for it to be down 1-2 quarts between oil changes but it could be a symptom of something else.
05-05-2019 12:07 PM
Howard Avery I changed the engine oil because the level was very low. Tranny fluid was full when I bought it.
05-04-2019 09:15 PM
Absolute Just out of curiosity , what fluid did you put in there? Transmission I mean
05-04-2019 08:54 AM
Howard Avery Okay thanks Mark. Maybe the oil change/trans shift thing is only a co inka dink, but it happened. Sorry, I have no way available to get the PCM data, so I guess time will tell if I actually have tranny issue or not. Thanks again.
05-03-2019 02:39 PM
Mark Kovalsky No, engine oil doesn't affect the transmission shifts. An extended time in second gear may or may not be a problem. There really isn't enough information here to diagnose that. I'd need the pedal position that you are at (from a readout of the PCM data) and the vehicle speed it shifted at. Also, a time from when the PCM commanded the shift until the shift actually happened.
05-03-2019 08:16 AM
Howard Avery Okay, update on my shifting issue. Like I mentioned originally, we just recently purchased the Excursion when we noticed the strange shift from second to third gear. Along with checking things out, I noticed the oil level was low and looked like it was way overdue for an oil change. So I changed the oil and surprisingly it seems as if the strange shift has gone away. The only thing I notice now is that it seems to stay in second longer than it should and that hard acceleration sometimes causes a hard shift. With lower acceleration the shift is normal. Even pulling my 8k pound camper the shifts are smooth. So I guess my question would be does the engine oil level affect the transmission in any way and is the extended time in second gear sound like a possible issue?
04-20-2019 04:59 PM
Absolute Hahaha, yup, valve body, my typo. Oops. But yes, I totally believe that VALVE BODY made a massive difference in the longevity of my transmission. It also made massive improvments in shifting across the board with all my tunes. Towing included. I think it was around 200 bucks when I bought it, well worth the dollars. Wish I could afford the transmission he makes as well. Being in Canada, by the time I cover shipping and core return, exchange, duty etc etc, I'm looking at about 10k for it. Want it , just cant buck up that much right now. I'd prefer to do a standard conversion. Had an entire kit lined up, with everything I needed, procrastinated, and at 1500 for the whole works some one else scooped it up before I was done humming and hawing. Haven't seen one since. Any one have a tissue.
04-20-2019 04:35 PM
Mark Kovalsky Valve body, not throttle body. Transmissions do not have throttle bodies.
04-20-2019 01:21 PM
Big Horn
Quote:
Originally Posted by Absolute View Post
Quote:
Originally Posted by tcnofh1 View Post
The stock 4R100 in my 2000 7.3 had a weird kind of shift when under full throttle for that gear.
Original 4R100 lasted 203k miles, I replaced it with an HD4R100, the odd 2-3 shift under power was gone, so someone figured out how to fix it in the HD version.

John Wood figured that out along time ago. I have a stock tranny, and put Johns throttle body on there. Its still holding together, and I toss all my torque at it all the time. Before I got my low bed and rig, I used to tow my 26000 lb backhoe with my truck, and boy did that throttle body work great. I probably have 50 000 miles on it since I exceeded 500hp, still holding together. lol
Absolute, I have looked at the John Wood valve bodies on Strictly Diesel. For our trucks with a tuner, and everything else being stock, are you saying it will lead to additional longevity of the 4R100? I don’t have any complaints with my truck but will be towing something heavier than a fishing boat in the near future. TIA
04-20-2019 12:27 PM
Howard Avery Thanks guys. Sorry I couldn't give a better description of the problem. Just one more question. Does engine oil level have anything to do with transmission performance? I was reading some of the earlier posts about transmissions and came up on one that mentioned that it did. Anyway, I did notice my oil level was low, so I changed the oil and seems like it's shifting much better? Crazy or what, lol?
04-19-2019 11:38 AM
Absolute
Quote:
Originally Posted by tcnofh1 View Post
The stock 4R100 in my 2000 7.3 had a weird kind of shift when under full throttle for that gear.
Original 4R100 lasted 203k miles, I replaced it with an HD4R100, the odd 2-3 shift under power was gone, so someone figured out how to fix it in the HD version.

John Wood figured that out along time ago. I have a stock tranny, and put Johns throttle body on there. Its still holding together, and I toss all my torque at it all the time. Before I got my low bed and rig, I used to tow my 26000 lb backhoe with my truck, and boy did that throttle body work great. I probably have 50 000 miles on it since I exceeded 500hp, still holding together. lol
04-18-2019 07:44 PM
Mark Kovalsky I don't know what the problem is. I need more data. You need a tool that can tell what gear the PCM is commanding, and whether it is commanding the torque converter to lock or not.
04-18-2019 09:05 AM
tcnofh1 The stock 4R100 in my 2000 7.3 had a weird kind of shift when under full throttle for that gear.
Original 4R100 lasted 203k miles, I replaced it with an HD4R100, the odd 2-3 shift under power was gone, so someone figured out how to fix it in the HD version.
04-18-2019 05:27 AM
Howard Avery The fluid level is full, no odor and is red in color.
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