68RFE Trans-Brake & Reverse Manual valve bodies

CRT

CRT

New member
How many of youz switch to a billet reverse manual and or trans brake for the 68RFE ? shift pattern MAY look like this, a shifter will be needed also.
The valve body would fix all the burn clutch issues in the UD & OD.


P
RN
1
2 6
3 5
4 4


shift down 1 2 3 4 slide to right then shift up 4 5 6
 
Last edited:
CRT said:
How many of youz switch to a billet reverse manual and or trans brake for the 68RFE ? shift pattern MAY look like this, a shifter will be needed also.
The valve body would fix all the burn clutch issues in the UD & OD.


P
RN
1
2 6
3 5
4 4


shift down 1 2 3 4 slide to right then shift up 4 5 6
Click to expand...

I'm pretty sure I just got a hard-on.....

I'm in.

Would a manual ECM be needed?
 
What would you do for line pressure?
Assuming you put in a PRV like the stock VB, what would you have it crack at?
The stock 07.5-09 pump can only handle 160-170psi constant
The 2010+ pump can do 170-180psi constant.
The stock VB's can not handle much more than 170psi, and the billet ones done like much more than 210-220psi.
If you were to have it constant pressure, how would the shafts hold up to those aggressive shifts?
The trans learns how thick the clutches are and shifts appropriately, and doesn't have bands. Would that be a problem for a logic-less VB?

I'm personally not interested in a MVB for the 68RFE, but a revisited VB that still is controlled by the TCM could be awesome.
OEM connector, much better solenoids, solenoid controlled PRV, optional line lock.

I feel I could boost launch my 12V thousands of times with my PCM controlled, built 47re. I want that kind of confidence out of my 68rfe!


blackmega3500 said:
I'm pretty sure I just got a hard-on.....
Click to expand...

You were the first person I thought of when I saw this thread. Did you ever swap your solenoid pack?
 
Last edited:
CorneliusRox said:
What would you do for line pressure?
Assuming you put in a PRV like the stock VB, what would you have it crack at?
The stock 07.5-09 pump can only handle 160-170psi constant
The 2010+ pump can do 170-180psi constant.
The stock VB's can not handle much more than 170psi, and the billet ones done like much more than 210-220psi.
If you were to have it constant pressure, how would the shafts hold up to those aggressive shifts?
The trans learns how thick the clutches are and shifts appropriately, and doesn't have bands. Would that be a problem for a logic-less VB?

I'm personally not interested in a MVB for the 68RFE, but a revisited VB that still is controlled by the TCM could be awesome.
OEM connector, much better solenoids, solenoid controlled PRV, optional line lock.

I feel I could boost launch my 12V thousands of times with my PCM controlled, built 47re. I want that kind of confidence out of my 68rfe!




You were the first person I thought of when I saw this thread. Did you ever swap your solenoid pack?
Click to expand...


I thought an aftermarket 68 VB would hold a max of 250....
 
I'm fairly certain I've seen info about TC housing ballooning a bit at 220+psi, which likely is going to cause uneven wear on the lock up clutches and inefficient power transfer.

Who knows though, maybe that's been addressed since the documents I've read.
 
As much as I'd love to see this happen, I don't see how you're gonna keep a clutch to clutch transmission happy by controlling it hydraulically. There's gonna have to be either a bind or a flare on each shift, I'd imagine you could control shift timing by changing an orifice size but that's going to vary for each transmission and as it wears over time.
 
ya I am going to try, its on the back burner now cause all the 48re valve body orders
 
What kind of shifter would do this? I'm lost. Is this something that's been done on a different application?
 
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