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Old 03-07-2018, 11:56 AM   #1
Biohmmwv

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1st gear lock up in a 47rh

Can anyone share information on how to modify the valve body on a 47rh to achieve 1st gear lock up?
I am kicking around the idea of putting together an Adrino and having it control lockup in each gear along with pulling on the TV cable to delay the shift before unlocking the converter, releasing the TV cable then locking back up.
I currently have manual 2nd gear lock up and have been unlocking the torque converter just before the transmission shifts to 3rd. but I need to know how soon lockup can be engaged in first without lugging the engine, or having too much of a drop in RPMs.
I want to see if I can get away with not going to an aftermarket torque converter just to have the tighter stator.
I'll be building a spare 47rh transmission with a 48re Stator and pump gear for increased flow. Hopefully, the pump upgrade (along with higher line pressure in the valve body) will provide enough pressure for low rpm engagement of the lockup.
So, a description and picture of what needs to be done for 1st gear lockup would be appreciated.
 
Old 03-09-2018, 12:33 PM   #2
Biohmmwv

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Anyone?
 
Old 03-09-2018, 08:56 PM   #3
Redrider2911

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I really don’t see a use for 1st gear lockup unless you are Wheelin... have you checked out my thread on electronic conversion of the 47rh?
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Old 03-10-2018, 07:19 PM   #4
Biohmmwv

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I don't want to covert my hydraulic unit to electronic. I like not having a computer control the transmission.
What I am after is hopefully doing away with the need for a low stall converter.
 
Old 03-10-2018, 08:44 PM   #5
Redrider2911

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“I am kicking around the idea of putting together an Adrino and having it control lockup in each gear along with pulling on the TV cable to delay the shift before unlocking the converter, releasing the TV cable then locking back up.”

“I like not having a computer control the transmission...”

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Old 03-10-2018, 08:52 PM   #6
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I like the TV modulation idea. I'm not sure how practical it is in the long run.

Be careful about how you get your speed signal. I killed an arduino by designing a faulty circuit.

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Old 03-12-2018, 03:29 AM   #7
Biohmmwv

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I was planning on using governor pressure for the speed signal since it is supposed to be about 1psi per 1mph. Then I would use the pressure ports to tell the Adrino if the a gear was already applied.

I like the 47rh as I could releasable have it computer "assisted" and still have a hydralic backup if there were a systems failure.
Reading comprehension is important Redrider2911
 
Old 03-12-2018, 11:05 AM   #8
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A 47/48 with lockup in first gear results in much engine stalling and greatly increases drive train issues for anything behind the convertor. I would not recommend.
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Old 03-12-2018, 04:27 PM   #9
Biohmmwv

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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.

Quote:
Originally Posted by joefarmer View Post
A 47/48 with lockup in first gear results in much engine stalling and greatly increases drive train issues for anything behind the convertor. I would not recommend.
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?
 
Old 03-12-2018, 05:51 PM   #10
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How many rpms does it drop when it does into lockup? That is a locked hard gear shift. Expect that through all gears. It will he violent to say the least.
 
Old 03-12-2018, 06:39 PM   #11
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When it goes into OD not just regular lockup. Darn fat fingers
 
Old 03-12-2018, 08:37 PM   #12
Biohmmwv

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The RPM drop depends upon throttle input. I make a habit of getting off the throttle just before it shifts, and I unlock the converter when it is in second gear and it is about to shift into third.

If I'm reading your question right, there is a 200-400 rpm drop (depending upon throttle pressure) when it shifts from 3rd locked to 4th unlocked. There is a 400-500 rpm drop when it goes from 4th unlocked to 4th locked.

When taking off from a stop the RPMs are 1200-1500 when it starts to move on flat ground. on a hill with my foot in it the RPM can get up to 2100.
 
Old 03-12-2018, 08:42 PM   #13
Biohmmwv

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Another thing, the shifts are predictable. At 20mph the trans will shift to 2nd gear then to 3rd gear at 30mph.
 
Old 03-13-2018, 04:45 AM   #14
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There is no such thing as 4th with nonlock up. That gear only exists when the converter is locked. 1,2,3,3lu,OD
 
Old 03-13-2018, 05:49 AM   #15
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Quote:
Originally Posted by turbo2387 View Post
There is no such thing as 4th with nonlock up. That gear only exists when the converter is locked. 1,2,3,3lu,OD

Are you sure about that?
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Old 03-13-2018, 06:14 AM   #16
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pretty confident
 
Old 03-13-2018, 06:16 AM   #17
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every 4 speed 47rh or re i've every owned shifts 5 times not 6. cut the lock up wire and OD doesn't happen. you just get 1,2,3. fix the lock up solenoid and you get 1,2,3,3lu. fix the od solenoid and you get, 1,2,3,3lu,OD. making your 3 speed OD transmission feel like a 5 speed.
 
Old 03-13-2018, 06:29 AM   #18
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On a 47rh lockup is the last shift, after od.
 
Old 03-13-2018, 09:35 AM   #19
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Quote:
Originally Posted by turbo2387 View Post
every 4 speed 47rh or re i've every owned shifts 5 times not 6. cut the lock up wire and OD doesn't happen. you just get 1,2,3. fix the lock up solenoid and you get 1,2,3,3lu. fix the od solenoid and you get, 1,2,3,3lu,OD. making your 3 speed OD transmission feel like a 5 speed.

My 47RE on 97 dodge. Shut OD off, you get 1, 2, 3, LU. Hit OD on, it unlocks, then you get OD, then LU. This is IIRC correctly. The standard shift strategy I believe is as your saying, however(again if memory serves me correctly) there is no hydraulic reason that OD needs LU, and LU needs OD.
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Old 03-13-2018, 09:39 AM   #20
Redrider2911

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Quote:
Originally Posted by turbo2387 View Post
There is no such thing as 4th with nonlock up. That gear only exists when the converter is locked. 1,2,3,3lu,OD
Wrong. Let it shift normally into 4th gear, it will almost instantly lock up so you might not notice it. Then roll into the throttle on a decent grade. You will feel the torque converter unlock and the rpms raise a little bit all while in 4th gear.
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