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  #25  
Old 07-21-2015, 12:46 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
This new magnet is placed on the outside of the pan?
How are the accumulator pistons? On mine i had some tipe of pitting on one of them, no idea how that happened. Seemed as it was caused by cavitation.
That's weird, I only did a few as I had to be sleeping early. This week is actually a huge hockey ttournament for me, so I'm on the ice more than I'm not and when I'm not, I try to rest and prepare for the next round. I'm lucky I have other means of transportation, but that's besides the point, I just wanted to explain my slow progress.

For mine, I noticed something similar. I started with I believe the 4th actuator piston, and when I took it out, it seemed to have pretty uniform 'scoring' for lack of a better term. I took a picture actually, if you look really closely, you can see a diagonal line in the piston. I didn't think much of it.



As for the magnet, it is on the outside. I want sure of clearances inside the pan and I didn't want it to interfere with the valve body, so I opted for the exterior one. But let me tell you, I did some tests and it is so strong. And this is their low end strength model.

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  #26  
Old 07-21-2015, 11:17 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Finally, the work to the valve body is done! I didn't even get to reinstall it yet, but most definitely tomorrow! The work was really simple, but be sure to have a T25 socket to get all 1,000 of those bolts out! All in all. I probably spent 2.5 hours installing the Transgo shift kit, replacing the solenoid, and cleaning it all to a nice shine. Here are some pretty boring pics, but it's what went on.

These are the new actuator springs, they are stiffer. The new one is on the right here.



My finger is pointing to the seal that is to be replaced on each actuator piston (only the inner seal). A new ring and expander take its place for a better seal.



Not too sure what this one does, but a new 'self lubricating' switch valve replaces the old along with a cap. The new set is on the bottom.



To cover it all, a new reinforced plate holds it all in.



And the solution to it all, the new solenoid.



All cleaned up and ready for installation!



Hopefully this does the trick! I will seal it all up tomorrow!

A HUGE thanks goes out to Frango, I owe you, bud!
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  #27  
Old 07-22-2015, 10:40 AM
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Re: 05' JGC WK Stuck in 3rd Gear!

Good to see that it is going smoothly.
Donīt know if you like to learn how the transmission works, if not, then disregard the following:
The L/R switch valve sits in the hydraulic circuit towards the L/R clutch (Low/Reverse). As the name already shows, this clutch is used for 1st and reverse gear. Since 1st gear uses an other solenoid and circuit then reverse, they had to build in a shuttle valve (the L/R switch valve) to be able to use one circuit or the other. They claim that the new valve has self cleaning properties. This is done by the two thin grooves they have cut into the valve, which can collect any dirt particles and let them flow away when the shuttle moves to its opposite position. It will prevent the valve from sticking. If it really works, i donīt know.
The springs you have changed are for the accumulators, that are no actuators.
Their purpose is to create the overlap time during a shift. That works like this: in general, to get torque to the output shaft of the transmission, two clutches will be engaged, 1 input clutch (underdrive or overdrive or reverse) and an output clutch (LR or 2C or 4C). Making different combinations of input clutch and output clutch, is giving the different gears.
So to change gear, one of the two clutches actuated will need to release, while an other clutch will need to be actuated. If you would release one, and then actuate the other, the engine would be disconnected from the wheels for a (short) period and would increase its rpm probably until redline, so that is undesirable. What they did is that they actuate the next gears clutch first, and then release the other. In that way you prevent the engine runaway, but would have two clutches, with different speeds, actuated, and one or both will be slipping, creating lots of heat and wear. This will also create a harsh shift. They solved this by using the accumulators. When a clutch is actuated, its accumulator piston is forced against the spring pressure, and will be moved, so creating a certain amount of trapped fluid under pressure. There is a small drain hole in the accumulator housing on the piston heads side. As soon as the solenoid for the respective clutch opens, the accumulator will fill up with fluid, while pushing the piston against the spring, causing a delay in pressure buildup on the clutch (this delay is something in miliseconds). At the same time (as the first clutch solenoid energises), the solenoid from the releasing clutch is deactivated. Now the trapped fluid in the accumulator will keep the releasing clutch pressurised for some miliseconds, while its fluid escapes via the small drain hole in the accumulator housing (and also a small drain hole in the clutch piston housing).
Originally, Chrysler put in accumulator springs for comfort shifts (so not feeling the shifts), making the shift overlap times long (so the time that both clutches are engaged and creating heat and wear). Transgo made stronger springs for the accumulators, causing more pressure to the actuating clutch and a shorter time for the releasing clutch accumulator to bleed down the fluid, so creating a shorter overlap time which causes less slipping, thus less wear and heat buildup. This makes the shifts a bit less comfortable, at least, you can feel them, they feel firmer.
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  #28  
Old 07-30-2015, 09:47 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Any news on this, does the jeep shift normally again?
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  #29  
Old 07-30-2015, 11:11 PM
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Re: 05' JGC WK Stuck in 3rd Gear!

Quote:
Originally Posted by Frango100 View Post
Any news on this, does the jeep shift normally again?
Yes!

Let me begin by apologizing for the delay, I read your last response a hundred times over and thanks to you, I understand what I just did to my own Jeep... Hahaha, but really, you know what's going on and I appreciate the passing of your knowledge!

I've been driving the Jeep for a few days now and what u realize is that the shifts, while slightly firmer, are most noticeably quicker. And that's an understatement. The shifts while at normal shifiting points lower in the RPMs are significantly quicker and downshifts allow the Jeep to have less lag between shifting and accelerating. While at higher RPMs, it picks up where it leaves off MUCH quicker meaning that it starts accelerating in the next gear much sooner than it did.

It really pushes me back in my seat too when it shifts at higher RPMs, I love it. Most of the changes are subtle, but for myself, they are outstanding!

Thanks again for all of your help, you've been more than I could have asked for. I look forward to hearing from you in the future!
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  #30  
Old 07-31-2015, 08:42 AM
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Re: 05' JGC WK Stuck in 3rd Gear!

A few years back i had no idea how an automatic transmission was working, but after having some troubles with my own transmission, i needed to learn first the way it worked, before i could tell what the problem could be. So i did a lot of reading and also doing the rebuild myself, teached me quite a bit. I love mechanics and like to go deep into it, to understand what is going on.
And many times, by trying to pass the information to others, i see that i didnt undersood it completely myself, and learn a bit more as well.
What is the use in getting information, if you cant/wont share it with others?
Good to hear that you like the shift kit. Happy jeeping.
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