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I have a truck that had a Trans Go kit installed. I recently dropped the pan and swapped the valve body for a John Woods model.
My truck still shifts very smooth.....my last truck was a lot firmer. I am wondering if I missed something...I was expecting a LOT firmer shifts with the JW valve body.
On page 5 of this document...it shows a calibration plate.....could I have missed removing this? I don't remember seeing it when the pan was dropped, but then I wasn't looking for it either. https://res.cloudinary.com/transgo/w...k/4R100HD2.pdf
Tunes from GH on 160/30 injectors....maybe the tunes? Here is what I sent them for tuning....
PHP Hydra
Hex Code 1D463413
Bjox Code VDH2
Automatic Trans
160/30 injectors
GTP38 with RiffRaff 4x4 and KC S300 turbine shaft and GTP 360 bearing kit
stock HPOP
4" exhaust, Donaldson Blue 6637 style intake, EBPV delete, Hi Flow exhaust outlet, stainless fuel lines, JIC oil lines, Hutch/Harpoon mod,
John Woods valve body, Tugger kit, 6.0 trans cooler, 36-6 GUT torque converter, HD center support kit,
Are you saying you may have doubled up the plates or that you never installed one when switching to the JW?
You can adjust firmness with the hole sizes but it’s also controlled by the PCM (tune). My TW tunes shift way too hard for my liking with the Transgo kit. The PHP tunes shift pretty nice. You could ask for a tune revision I suppose.
Are you saying you may have doubled up the plates or that you never installed one when switching to the JW?
You can adjust firmness with the hole sizes but it’s also controlled by the PCM (tune). My TW tunes shift way too hard for my liking with the Transgo kit. The PHP tunes shift pretty nice. You could ask for a tune revision I suppose.
I wasn't aware there was a plate...I dropped the old valve body and bolted up the John Wood version....that's it. I didn't even think to check for a plate.
I was thinking of ordering the PHP Minotaur tunes, but have been reading some rather bad reviews on here about them. I liked the ones they had for my old split shots....great shift points. Ill check with GH on revisions first.
I also had to order a new shift lever...noticed my OD light was not coming on...nor would it downshift when I pushed the button. Took the collar off and found a busted wire.....repaired it, but got the same result.
You can ask GH to raise your shift pressures on your tunes. I have to do this every time I get new tunes because the guy that rebuilt my transmission didn't have the valve body adjusted correctly and could barely feel the truck change gears. With that said I'm surprised the JW valve body didn't give you firm shifts. Seems like everyone that installed a JW valve body said the shifts were really firm if I remember correctly.
You can ask GH to raise your shift pressures on your tunes. I have to do this every time I get new tunes because the guy that rebuilt my transmission didn't have the valve body adjusted correctly and could barely feel the truck change gears. With that said I'm surprised the JW valve body didn't give you firm shifts. Seems like everyone that installed a JW valve body said the shifts were really firm if I remember correctly.
I will contact them on Monday....and that was exactly what I was thinking too. I have put a JW valve body in 2 of my older trucks....and what a difference. Super firm shifts...not harsh though....and uphill climbs it left it in the lower gear instead of shifting into OD.
It felt like there was no difference at all here.
and uphill climbs it left it in the lower gear instead of shifting into OD.
The valve body has no effect on when it shifts. That is 100% controlled by the PCM. Changing the valve body cannot change when it shifts, just how hard or soft it shifts.
The valve body has no effect on when it shifts. That is 100% controlled by the PCM. Changing the valve body cannot change when it shifts, just how hard or soft it shifts.
So this was in the PHP canned tune? Good to know....
Any idea what they mean by 36-6 GUT torque converter?
The valve body has no effect on when it shifts. That is 100% controlled by the PCM. Changing the valve body cannot change when it shifts, just how hard or soft it shifts.
I can attest to that, I have the Hydra tuner, and the stock tunes that came with it, all of them change how the transmission shifts, softer or firmer, earlier or later, depending on the tune selected.
The valve body has no effect on when it shifts. That is 100% controlled by the PCM. Changing the valve body cannot change when it shifts, just how hard or soft it shifts.
Mark I was just curious on how the PCM is able to create a higher or lower pressure? From what I understand you can adjust the pressure with the valve body by making the holes bigger or smaller but wasn't sure how the PCM demands more pressure. Just trying to learn, thanks
Mark I was just curious on how the PCM is able to create a higher or lower pressure? From what I understand you can adjust the pressure with the valve body by making the holes bigger or smaller but wasn't sure how the PCM demands more pressure. Just trying to learn, thanks
Mark can give a better answer but I’ll take a swing at part of it. I like to see how much of my thoughts Mark has to correct! lol
The holes in the plate do not change the pressure. It changes the rate of flow of the fluid for filling the piston. Larger the hole, the quicker the fluid goes in, and quicker/harder it shifts. That’s it in a nutshell.
I assume the 4R100 is like other solenoid controlled transmissions I’ve been around. It should have a solenoid that effects the line pressure, controlled by the PCM. There is likely a base pressure set mechanically by the line pressure valve springs etc and then the solenoid is used to boost the base pressure.
I like to see how much of my thoughts Mark has to correct! lol
Not that many!
Originally Posted by RacinJasonWV
The holes in the plate do not change the pressure. It changes the rate of flow of the fluid for filling the piston. Larger the hole, the quicker the fluid goes in, and quicker/harder it shifts. That’s it in a nutshell.
That is completely correct.
Originally Posted by RacinJasonWV
It should have a solenoid that effects the line pressure, controlled by the PCM. There is likely a base pressure set mechanically by the line pressure valve springs etc and then the solenoid is used to boost the base pressure.
There is an Electronic Pressure Control Solenoid (EPC) that controls the line pressure main regulator valve. With no input from the EPC the line pressure will be at around 60 PSI. The EPC is used to move the valve to control pressure. It can control up to around 300 PSI.
For most of my career at Ford it was my job to set these pressures on the transmissions that I worked on.
There is an Electronic Pressure Control Solenoid (EPC) that controls the line pressure main regulator valve. With no input from the EPC the line pressure will be at around 60 PSI. The EPC is used to move the valve to control pressure. It can control up to around 300 PSI.
For most of my career at Ford it was my job to set these pressures on the transmissions that I worked on.
So this is what I should mention to GH in regards to my shifts with their tuning? Any particular PSI number that is a sweet spot for a nice firm shift but not too harsh? I wish I knew the PSI of my last truck....it was perfect with the PHP tunes.
If I were able to get the actual data from the tune, would anybody be able to give me that PSI number?
