Converter for towing

[hondarider552]

I loved the 1056 with my LBZ and 66mm HTT. Towed 16k with it and never wished I went different. I also towed heavy with my GMC that had the ML. I really liked them. I had a 1058 in my single cab when the engine was stock and towed 9k with it and the converter locking was pretty harsh in tow/haul at 25mph, but other than that it was decent.

 

[ikeG]

I loved the 1056 with my LBZ and 66mm HTT. Towed 16k with it and never wished I went different. I also towed heavy with my GMC that had the ML. I really liked them. I had a 1058 in my single cab when the engine was stock and towed 9k with it and the converter locking was pretty harsh in tow/haul at 25mph, but other than that it was decent.

Had the opposite experience with a 1056 as far as locking goes. It locked extremely harsh, especially in tow/haul. Coupled and stalled just fine, but always from day 1 it locked wicked hard. While towing 14k under hard throttle, you'd think the gooseneck was gonna stretch apart when she locked.

 

[hondarider552]

Really? Interesting. I think the original 1056 is still in my LBZ from when Mike built it in 2008, not sure, but it locked very smoothly in T/H.


I would never want to tow heavy with a ATS 5 star though :rofl:

 

[mtl_dmax]

Interesting that you have 2 people with very different experiences using the 1056 converter.

I wonder if differences in line pressure could account for it locking up that much harder with one than the other?

Perhaps there were different versions of the 1056 converter too? I noticed the newest one seems to be labeled 3D.

 

[Mike L.]

They are all labeled 3D ( 3 disc ) fro SC. TCC can be harsh if you have knock down eliminated.

 

[PureHybrid]

My 1056 locks smooth. A little extra bump compared to stock but you'd probably never notice. I have no issues with the 1056, only towed about 7k a few times nothing heavy. Since I don't tow very much I would like to try a different converter if the trans or engine ever comes out...

 

[mtl_dmax]

TCC can be harsh if you have knock down eliminated.

Would this just be a change to the TCM tune?

 

[Evan@InglewoodTrans]

Would this just be a change to the TCM tune?

It's a modification done inside the transmission.

 

[mtl_dmax]

It's a modification done inside the transmission.

So if you need to eliminate knock down (Transgo kit?) when you build a tranny what guides why some converters "feel" more harsh than others?

Sorry for all the questions but the insight is most helpful.

 

[Evan@InglewoodTrans]

So if you need to eliminate knock down (Transgo kit?) when you build a tranny what guides why some converters "feel" more harsh than others?

Sorry for all the questions but the insight is most helpful.

Not everyone eliminates knock down when they build a transmission. The transgo kit unless modified just decreases the amount of pressure that is dropped when the converter locks.

 

[mtl_dmax]

Not everyone eliminates knock down when they build a transmission. The transgo kit unless modified just decreases the amount of pressure that is dropped when the converter locks.

I assume you mean modifying the valve like they did in this thread:
http://www.duramaxdiesels.com/forum/showthread.php?t=45809


At what point should people consider this mod vs just installing the Transgo valve in the kit? is it a certain HP/torque level?

 

[Mike L.]

I assume you mean modifying the valve like they did in this thread:
http://www.duramaxdiesels.com/forum/showthread.php?t=45809


At what point should people consider this mod vs just installing the Transgo valve in the kit? is it a certain HP/torque level?

The Transgo valve was never meant to help the converter clutches as they really don't need help with multi discs unless you are a racer.
When the TCC applies it knocks down 100 psi when the converter flow valve strokes. That pressure drop is seen across the board to ALL components.
Stock pressure runs 225/230 psi. Add a .130 pressure regulator shim available in most kits and your pressure will raise to 255 psi. stroke the converter valve and that drops to 155 psi or less. That's not much holding power for the clutches for aggressive driving. The Transgo valve will limit knock down about 50%. That is good enough for 75% of us.
All my rebuilds have no knock down. I now also install my pressure regulator spring in my builds.

 

[mtl_dmax]

The Transgo valve was never meant to help the converter clutches as they really don't need help with multi discs unless you are a racer.
When the TCC applies it knocks down 100 psi when the converter flow valve strokes. That pressure drop is seen across the board to ALL components.
Stock pressure runs 225/230 psi. Add a .130 pressure regulator shim available in most kits and your pressure will raise to 255 psi. stroke the converter valve and that drops to 155 psi or less. That's not much holding power for the clutches for aggressive driving. The Transgo valve will limit knock down about 50%. That is good enough for 75% of us.
All my rebuilds have no knock down. I now also install my pressure regulator spring in my builds.

I appreciate the info Mike, very helpful.

Does equalizing the fluid pressures and raising the line pressure lower the efficiency (ie decreased MPG)? any idea how much?

Trying to get the best balance of capability vs efficiency I can.