2-3 shuttle shift fix

[dodgeram5-92500]

I had the same shuttle shift that you guys were describing and in the end it ended up being the transducer and pressure sensor on the valve body of my tranny. I went to these guys and got both parts which are an upgrade from borg warner and it immediately fixed the issue. NO MORE SHUTTLE SHIFTING!!! And the parts were cheap, and they only took about 20 min to replace, very easy fix.

the link to both parts are below.

http://www.cascadetransmissionparts.com/48repressuretransducer2000up.aspx
http://www.cascadetransmissionparts.com/48regovernorsolenoidborg.aspx

[tinman]

I still have the shuttle shift and it is driving me crazy . I have tried BW solenoid, GM solenoid, new transducer, and tighten the band about 1/4 turn over. Nothing made any difference. I used efi to move the TTVA angle up and down a few degrees and it only changed the point at which it will shuttle shift, didn't help it at all. I would certainly appreciate any other advise.

[2007 5.9]

Combination of Gov pressure map and TTVA map will help

You may also look into re-adjusting your 2nd gear band.

[tinman]

Adjusting the 2nd gear band helps for a few months but its always goes back to its usual habits . Which direction should I go with the gov. pressure? I've read elsewhere upping the ttva angle a little (Which I tried). Up the pressure also? I do have a DTT shift enhancer as well.

[2007 5.9]

Take the enhancer out...ttva and that do exactly the same thing.

Take it out and retry ttva adjustments

[skneeland]

i respanned and changed mine to this. it hasnt eliminated the shuttle completely, but it sure helped. it holds the lower gears a little longer now and will only make the odd downshift now and then instead of hunting back and forth15648

[johhnyfoxtrot]

I you recently had the valve body off or apart such as a new trans that sound like a bad Govenor Pressure in vavle body I know I went thru 3 of them in two months just by removing them till I changed to a PATC conversion to a GM GP sensor.

[DoghouseDiesel]

Careful with those TTVA angles. Those TTVA angles are directly related to line pressure if you don't have a constant pressure VB. With enough HP, if you screw it up, you'll be burning up OD clutches.

[tinman]

Careful with those TTVA angles. Those TTVA angles are directly related to line pressure if you don't have a constant pressure VB. With enough HP, if you screw it up, you'll be burning up OD clutches.

So basically you're saying don't got down with the angle, only up? This way line pressure won't get too low?

Any utility in doing the mechanical advance on the TTVA motor. I assume that is that same as changing the angle in the table.

[2007 5.9]

Here is my personal TTVA map...

15679

[DoghouseDiesel]

Lowering the TTVA value will cause it to shift earlier, raising the value will delay the shifts. The TTVA angle effects the boost pressure and boost valve, which effects line pressure. Drag the TTVA angle out for too long and you're causing the line pressure to not rise as you're increasing the load....not a good thing to do. You also have a few other factors that messing with the TTVA can effect and if they're not adjusted correctly you get some weird up/down shifts and also a bunch converter locking/unlocking.

Being that the 48 doesn't have great line pressure as it is, unless the trans is modified, I DO NOT recommend lowering the TTVA angles for the sake of stretching out shift points. Making the shift points occur at higher RPM's is no issue, as you're increasing TTVA angle and therefore line pressure, which is a good thing. But again, you have to take a few other things into account otherwise you'll still get some weird tranny behavior.

On mine, with the single 88, I need the shift points much higher in the RPM range to stay on top of it. This is what mine looks like (minus the actual values and scale). Just for reference, this shifts at 3900 RPM's at WOT. You also have to look at your 3-4 up and down shift points and your converter lock and unlock, otherwise it'll be all over the place. You have a bit of room to increase the max TTVA angle also, 50* is not it's max travel. If you set it too high, you'll know it, it'll toss a code for the TTVA being stuck. That's how you know you've reached the max angle for your particular trans.

15686

[skneeland]

You have a bit of room to increase the max TTVA angle also, 50* is not it's max travel. If you set it too high, you'll know it, it'll toss a code for the TTVA being stuck. That's how you know you've reached the max angle for your particular trans.

15686

What are the pros and cons to raising it past 50* to the highest possible setting?

[DoghouseDiesel]

Depends on how you're using the truck and what is done to the trans.

[skneeland]

Depends on how you're using the truck and what is done to the trans.

well in my case, i drive it like i stole it more often than i should. as for the transmission, i asked DTT to give me the works in hopes of handling the abuse. lol

[skneeland]

any drawback to increasing the minimum TTVA angle above 3*?

[2007 5.9]

any drawback to increasing the minimum TTVA angle above 3*?

My first value is 15*

[skneeland]

My first value is 15*

interesting...good to know.

i have been driving myself mad for the last week trying to totally eliminate the 2-3-2 shuttle. respanning and remapping both the TTVA and gov pressure maps. I have it to the point that its almost gone, except it will do one downshift to 2nd between 50-60kph, BUT only if i lift my foot off the pedal while in this range. No problems below 50, and if i accelerate right through to 60 it wont happen either.

[skneeland]

ok, someone wiser have a look and tell me whats wrong.

at around 740 frames and 940 frames it does that odd downshift i described earlier

between 550 and 1350 frames although the log says my desired pressure and actual pressures are in order, they are way out to lunch compared to my table (actual commanded pressure in this area is 150 to 300kPa) ?!?

the builder wants me to drop the pan and make some mods to the VB, but i cant help but wonder if there is more out of wack here?