4R100 diagnosis
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FTE Chapter Leader
Joined: May 2020
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From: Langley B.C. Canada
4R100 diagnosis
Just spent 5 hour round trip to end up back home.
2-1/2 into our journey transmission started slipping only in 3rd after TC lockup. Everything else worked as it should.
Pulled over at first safe turnout.
TFT was 210°, SDK tune 65 tow. 8500# trailer on the hitch.
FORScan was not running and tablet was dead so couldn’t hook it up once the problem arose.
Returned PCM to 00, and headed for home.
Once the trans cooled a bit 160-170 TC lock in 3rd didn’t slip.
Is she in her dying throes and by gods grace got me home, or is there something simple I should have a tranny shop look at first?
Got a line on a RDP stage 1.5 for $3200 including TC. Should I pull the trigger or have mine looked at???
2-1/2 into our journey transmission started slipping only in 3rd after TC lockup. Everything else worked as it should.
Pulled over at first safe turnout.
TFT was 210°, SDK tune 65 tow. 8500# trailer on the hitch.
FORScan was not running and tablet was dead so couldn’t hook it up once the problem arose.
Returned PCM to 00, and headed for home.
Once the trans cooled a bit 160-170 TC lock in 3rd didn’t slip.
Is she in her dying throes and by gods grace got me home, or is there something simple I should have a tranny shop look at first?
Got a line on a RDP stage 1.5 for $3200 including TC. Should I pull the trigger or have mine looked at???
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FTE Chapter Leader
Joined: May 2020
Posts: 2,936
Likes: 2,198
From: Langley B.C. Canada
Spoke with a transmission shop.
3rd in TC lockup is the direct drive clutch. Could be failing in more ways than one.
Got this guys shop from a buddy, turns out he builds transmissions for SDK’s race truck.
Truck goes in on Tuesday morning for a re-re. He’s got one on the shelf for me and bumped a couple of things to squeeze me in.
3rd in TC lockup is the direct drive clutch. Could be failing in more ways than one.
Got this guys shop from a buddy, turns out he builds transmissions for SDK’s race truck.
Truck goes in on Tuesday morning for a re-re. He’s got one on the shelf for me and bumped a couple of things to squeeze me in.
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FTE Chapter Leader
Joined: May 2020
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From: Langley B.C. Canada
Yeah I was aware of that for temps. Thanks David.
I does have an aftermarket cooler on it already.
I was mentioning temps since when it did cool down 40ish degrees no more slipping.
When we turned around it also was downhill to the valley out of the Fraser Canyon.
Back to stock tune also helped with a decrease in demand.
I won’t say I was driving like a granny but I did get passed by more than one Semi.
I does have an aftermarket cooler on it already.
I was mentioning temps since when it did cool down 40ish degrees no more slipping.
When we turned around it also was downhill to the valley out of the Fraser Canyon.
Back to stock tune also helped with a decrease in demand.
I won’t say I was driving like a granny but I did get passed by more than one Semi.
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FTE Chapter Leader
Joined: May 2020
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From: Langley B.C. Canada
Probably not but that is what they looked like as they went past me on the uphill pulls as I was nursing it in 2nd.
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Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
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From: North Carolina, Raleigh
when you do trans do flex plate and TQ with triple disk billet.. Sam Wyse sell them.. that what he does on the stage 1 rebuilds I got.. summit racing flex plate is same money as OEM and better..
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FTE Chapter Leader
Joined: May 2020
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From: Langley B.C. Canada
Spoke with Rob at Summit Performance Transmissions for about 1/2 hour. He asked me a lot of questions first for the diagnosis, then about my use of the truck and future upgrades.
A billet TC is what he recommended for my usage. Said he could do the triple disk but for my needs and price tag it would be a waste of my money.
His standard build is guaranteed for up to 500hp with a 2 year unlimited km warranty.
I hadn’t considered the flex plate and will have that discussion with him on Tuesday morning when I drop off the truck.
Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
Likes: 87
From: North Carolina, Raleigh
triple disk give more holding power for acceleration and when using exhaust brake if you have done that mod. I run a mild 80 DD and 60 Tow tune and can feel the difference between a single and triple clutch. its not a requirement but a nice thing to do while you are doing..
as far as the flexplate i found cracks on one iwth 223K miles and far as i know OEM from factory.. summit make a racing plate that is super good.
go to post #9 on this thread to read more.. https://www.ford-trucks.com/forums/1...placement.html
as far as the flexplate i found cracks on one iwth 223K miles and far as i know OEM from factory.. summit make a racing plate that is super good.
go to post #9 on this thread to read more.. https://www.ford-trucks.com/forums/1...placement.html
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FTE Chapter Leader
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From: Langley B.C. Canada
triple disk give more holding power for acceleration
go to post #9 on this thread to read more.. https://www.ford-trucks.com/forums/1...placement.html
go to post #9 on this thread to read more.. https://www.ford-trucks.com/forums/1...placement.html
Flex plate was quite the deep dive as I followed all the links to related threads. Y2K makes an excellent point when it comes to the “billet” 💪 plate. Where does it flex… what gives???
Stamped it will be. Not sure who’s yet. Depends on what Rob has available.
Found one local to me at BD diesel.
https://ca.bddiesel.com/products/7-3...39410908037174
That’s a lot of money for a chunk of steel.
Summit racing is south of me across the border with a week and a half for shipping. That ain’t happening. Transmission goes in on Tuesday.
My truck currently has 202,000 kms = 126,000 miles and in its life with me has only seen 70,000 kms = 43,500 miles in 19 years. The fact that it even needs a transmission already is surprising to me.
Directly from the transmission shop it’s going to SDK to have all the tunes modified to be back to Stock PMT2 shift strategy.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
Billet flexplate is something that is used in racing,go for OEM style.
Ask Dan K,i'm sure that he confirms that triple disc TC is something that needs to be added.
I don't know why the tranny guy don't want you to have it..
Ask Dan K,i'm sure that he confirms that triple disc TC is something that needs to be added.
I don't know why the tranny guy don't want you to have it..
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,657
From: SE Florida
When a torque converter spins, it swells in the longitudinal direction. That is, it grows in size between the engine and transmission. The flex plate allows for this movement. If the flex plate is too stiff, such as a billet flex plate, the engine's thrust bearings take the load. This tends to wear out the thrust bearings quickly, leading to an engine rebuild.
Lead Driver
Joined: Jul 2017
Posts: 6,860
Likes: 2,334
From: WV
Hi Mark,
I’m not recommending a billet plate but have a question.
Won’t the TC “snout” just move into the transmission if the plate is stiff? Isn’t the TC endplay there to allow for the ballooning and heat growth?
I do think a stiffer plate will transfer more vibration and load to the crankshaft.
Personally I feel the slightly thicker Summit SFI plate is a good balance between longevity and performance due to seeing reports of OEM plates cracking. I’m not running it, just an opinion. And I understand it’s not an option for the OP.
I’m not recommending a billet plate but have a question.
Won’t the TC “snout” just move into the transmission if the plate is stiff? Isn’t the TC endplay there to allow for the ballooning and heat growth?
I do think a stiffer plate will transfer more vibration and load to the crankshaft.
Personally I feel the slightly thicker Summit SFI plate is a good balance between longevity and performance due to seeing reports of OEM plates cracking. I’m not running it, just an opinion. And I understand it’s not an option for the OP.