joefarmer
MR. Supreme Overlord
- Joined
- Jul 31, 2006
- Messages
- 6,137
My idea was to get the truck moving a little before lockup engaged.
I just don't know how many RPM it will drop with moderate throttle pressure.
2nd gear( which is the gear one usually takes off in while unloaded) in an NV4500 is 3.0 to 1 whereas 1st gear in the 47rh is 2.45 to one. It will take a little more forward movement before lockup can be engaged.
Basically, like slipping the clutch ( bad practice in a manual) longer in a manual transmission.
So, you're saying the transmission can't handle the power through it?
joefarmer, do you know where to get the instructions on how to do the mod on the valve body and can you share the info?
Goerend makes a separator plate to allow lockup in 1st gear. The VB that I'm currently testing in my truck with a standalone transmission controller is a constant pressure VB from Goerend. At very cold temperatures, the lockup shuttle valve (CCSV) doesn't have enough fluid flow on the backside and will immediately, hydraulically engage TCC resulting in a stall. If you drive through it, the resulting violent 1-2 shift feels like someone is trying to kick your kidneys into oblivion. I installed this VB ~95 days ago and I now need to replace driveshaft U-joints.
There is no such thing as 4th with nonlock up. That gear only exists when the converter is locked. 1,2,3,3lu,OD
By manually applying 12v to either solenoid, you can make the following gears:
- 1
- 1 + lockup (bad idea)
- 2
- 2 + lockup
- 2 + overdrive (bad idea #2)
- 2 + overdrive + lockup (bad idea #3)
- 3
- 3 + lockup
- 3 + overdrive
- 3 + overdrive + lockup
On the stock 47RE and RH VB, you cannot disengage OD unless the lockup solenoid is also disengaged. Anything labeled (bad idea) has personally resulted in broken parts for me.