4r100 build
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Laughing Gas
Joined: Mar 2009
Posts: 1,028
Likes: 0
From: long island
4r100 build
I have a 1999 e350 7.3 van with some mild upgrades.
4 inch turbo back exhaust
Billet turbo wheel
epbv delete with outlet and pedestal
hydra tuner
The truck is an absolute beast of a van and runs awesome, but the transmission is slowly robbing more and more power. It slips too much from one gear to the next and overall never seems to be “locked in”.
im sure its due for a rebuild, but i dont wanna build it to stock specs and then deal with this again in the near future. Im not really sure where to begin. I guess i would need to send the transmission out somewhere for a rebuild and assemble it with some sort of aftermarket torque converter. Im assuming these are the same trannys the pickups have.
4 inch turbo back exhaust
Billet turbo wheel
epbv delete with outlet and pedestal
hydra tuner
The truck is an absolute beast of a van and runs awesome, but the transmission is slowly robbing more and more power. It slips too much from one gear to the next and overall never seems to be “locked in”.
im sure its due for a rebuild, but i dont wanna build it to stock specs and then deal with this again in the near future. Im not really sure where to begin. I guess i would need to send the transmission out somewhere for a rebuild and assemble it with some sort of aftermarket torque converter. Im assuming these are the same trannys the pickups have.
FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
Lead Driver
Joined: Aug 2022
Posts: 5,053
Likes: 1,409
From: Oologah, OK
Call up Brian at BTS, and tell him your problems.
he will build it to your needs, not a 1,000 hp drag wagon.
https://www.brianstruckshop.com/about
he will build it to your needs, not a 1,000 hp drag wagon.
https://www.brianstruckshop.com/about
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
FYI
Stock converter from my freshly rebuilded 4r100 started slipping after putting Hydra on it.
I changed it to 3disc billet TC with extra low stall.
Holds good with 205/80 injectors.
Also,have you compared different tunes/ tuners?
Shift pressures and TC PWM varies.
Stock converter from my freshly rebuilded 4r100 started slipping after putting Hydra on it.
I changed it to 3disc billet TC with extra low stall.
Holds good with 205/80 injectors.
Also,have you compared different tunes/ tuners?
Shift pressures and TC PWM varies.
Thread Starter
|
Laughing Gas
Joined: Mar 2009
Posts: 1,028
Likes: 0
From: long island
FYI
Stock converter from my freshly rebuilded 4r100 started slipping after putting Hydra on it.
I changed it to 3disc billet TC with extra low stall.
Holds good with 205/80 injectors.
Also,have you compared different tunes/ tuners?
Shift pressures and TC PWM varies.
Stock converter from my freshly rebuilded 4r100 started slipping after putting Hydra on it.
I changed it to 3disc billet TC with extra low stall.
Holds good with 205/80 injectors.
Also,have you compared different tunes/ tuners?
Shift pressures and TC PWM varies.
There doesnt seem to be many hydra tunes for the vans. I just have the tunes they sent me it with.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
Who's tunes you are running?
Lower stall makes the TC "slip" less so power moves earlier to the rear wheels = more efficient.
Simplified examples:
After selecting D in flat,vehicle will move easier with no throttle or with very little pedal input.
When accelerating TC unlocked,lower stall converter will have lower RPMs and more torque to the rear wheels.
Resident transmission expert @Mark Kovalsky things ,that 7.3 engine has come with too high stall speed from the factory.
Lower stall makes the TC "slip" less so power moves earlier to the rear wheels = more efficient.
Simplified examples:
After selecting D in flat,vehicle will move easier with no throttle or with very little pedal input.
When accelerating TC unlocked,lower stall converter will have lower RPMs and more torque to the rear wheels.
Resident transmission expert @Mark Kovalsky things ,that 7.3 engine has come with too high stall speed from the factory.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,628
From: SE Florida
Ideally, the stall speed should be just below the RPM where the engine produces peak torque. I forget the numbers on the 7.3L stall and peak torque, but they are out of whack. The stall speed is above peak torque.
If stall is just below peak torque on a hard launch you get the engine producing peak torque and the torque converter at its maximum multiplication at the same time. This gets the most possible torque to the rear axle. When stall is above peak torque you get something less than max engine torque multiplied by max torque converter.
If stall is just below peak torque on a hard launch you get the engine producing peak torque and the torque converter at its maximum multiplication at the same time. This gets the most possible torque to the rear axle. When stall is above peak torque you get something less than max engine torque multiplied by max torque converter.
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Laughing Gas
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Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
Thread Starter
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Laughing Gas
Joined: Mar 2009
Posts: 1,028
Likes: 0
From: long island
I spoke to brian at bts. Amazing dude and was happy to explain everything.
He now builds trannys only 1 way. Its a triple disc converter with a special coupling and all the best guts. It costs 5500$ and handles over 600 horsepower.
now, sure id love to do this. But i dont think i can warrant that sort of tranny in my very mildly modified daily driver. Also hes in arksanas and im in new york, so id have to freight the new tranny here or drive out there. He does swap them in for free which is cool, but the time and money to drive there might not pay.
ive seen some other “upgraded” 4r100 transmissions for around 2500$. They all use a billet torque converter which is probably the only thing i need. I dont think my tranny is slipping, im pretty sure im just blowing thru the converter
He now builds trannys only 1 way. Its a triple disc converter with a special coupling and all the best guts. It costs 5500$ and handles over 600 horsepower.
now, sure id love to do this. But i dont think i can warrant that sort of tranny in my very mildly modified daily driver. Also hes in arksanas and im in new york, so id have to freight the new tranny here or drive out there. He does swap them in for free which is cool, but the time and money to drive there might not pay.
ive seen some other “upgraded” 4r100 transmissions for around 2500$. They all use a billet torque converter which is probably the only thing i need. I dont think my tranny is slipping, im pretty sure im just blowing thru the converter
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
Years back I had an OBS with the E4OD....and the convertor was slipping during lock-up. I ordered a convertor from BD Diesel. I dropped the trans, swapped in the new convertor and life was good until I sold it.
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