Performance valve body for the allison

[James Hess]

Just a few questions,

* What is it for

* What exactly does it do

* How does it help over stock

* Is it a worth while mod if you are going to only be replacing your clutches and possible converter to beef up a stock trans to hold power for now

* What are the power levels that this is really needed and starts to become an issue with a stock valvebody

* What is a good average price

Any input is appreciated on this subject and all opinions are welcome i want to hear good and bad about this mod costs and that sort of thing. Also keep in mind to keep things clean that what anyone says about it is their opinion so please dont argue cause it brings nothing good. :thumb:

Thanks in advance. :Handshake:

[hondarider552]

IMO the valvebody is only as good as the clutches.

[James Hess]

Well thats the thing, the add for the valve body said it helped increas line pressure over all gear(what i understand anyway) and what it does is take the main line pressure and run that through all lines to help hold the clutches.

I plan on getting some ALTO clutches and a better converter if i can pick one up from someone who hasnt abused it and its still in good condition with plenty of life left(and yes i plan on buying a lottery ticket and winning it all to myself when i find that haha) to beef up my trans for now till i can get the Stg. 4 suncoast.

It also stats in the add(description) that it helps in keeping trans problems to a minimun more or less.

Just some food for thought to me and i dont think it could do anything but help if installed, yes i agree its only as good as the clutches to say dont expect to hold 500 HP on stock clutches with this mod but again it couldnt hurt to have it.

[1lowdiesel]

i think you're on the right track. correct that it will firm up the line pressure and stop some of the slippage and possible limping. but of couse it is only as good as the clutches. imo i think it's a good upgrade, i've got mine sitting in the garage waiting to go in as well, there's just never enough time.

[Mike L.]

It's a big hype. The performance valve body is a stock valve body with Transgo trim valves; nothing more than a Transgo Jr. The G solenoid is blocked so there is no pressure drop at idle which is going to heat up your trans and in no way help it.
Pressure can not be increased through the valve body. What the Transgo valves or Bully Dog valves do is leak mainline pressure into the C3 and C4 clutch circuit which is using only control main pressure. The C1 and C2 clutches can not be helped through the valve body. Big waste of money IMHO.

[1lowdiesel]

well we'll find out...

what about a tuned tcm? better>worse?

[Mike L.]

well we'll find out...

what about a tuned tcm? better>worse?

Depends on who tuned it and if it is calibrated for the proper use. Best hotrod TCM for the street is the '01 but you have to make sure you have the right '01 as there were a few different ones. Extending shift points helps a lot because you take the shift out of the tq zone which will put a bigger strain on the clutches due to apply and release under too much tq.
On the '01 through '05 5 speed Alli the C1 and C2 clutch apply pistons do not hit the center of the clutch packs which means you are only getting 50% bite. Extra pressure helps this but does not solve the problem Only thicker bottom plate along with extra pressure will help this but not totaly solve it. more clutches help this also.

[1lowdiesel]

what about having a stock 05 tcm retuned, would you get the same results as getting an 01 tcm?

[Mike L.]

what about having a stock 05 tcm retuned, would you get the same results as getting an 01 tcm?

No. It is too smart. The adapts strategy on the '05 does not do well for high performance.

[James Hess]

Will the different year TCM's interchange with tuning? which TCM from 01 is the one you would want to use? What makes the certian 01 TCM better over the others?

I am trying to understand as much as i can about this stuff lol so sorry for all the questions.

[Diesel Tech]

The TCM's for all the 5 speeds are the same but the software in them is different. You can use any 5 speed TCM but just get the software reflash to what you want.

[James Hess]

Wasent Mike saying that they are "too smart" for that and it would be better just to get your hands on one that came with the programming in the first place.

I would rather have something that is tuned originaly to work well with what i am aiming for with any particular build because if it does "re-learn" and return back to stock parameters then you atleast have a fail safe id figure.

But i am not too keen with tuning yet and all this programming stuff lol.

[IOWA LLY]

Wasent Mike saying that they are "too smart" for that and it would be better just to get your hands on one that came with the programming in the first place.

I would rather have something that is tuned originaly to work well with what i am aiming for with any particular build because if it does "re-learn" and return back to stock parameters then you atleast have a fail safe id figure.

But i am not too keen with tuning yet and all this programming stuff lol.


No. Mike meant the software was to smart in the 05's. If you re-read what Steve said he said all the 5 speed TCM's are the same. (meaning hardware)

Software is simply what you program into it.

So if want an 01 TCM all you have to do is re-flash it to 01 software.

[James Hess]

Oh haha now i get it ):h, but what is the difference with the software that makes it so much better though?

Would this be a worth while mod to do over the valvebody? If it was i dont see why people havnt done it but there is more than likely alot more to it than were talking about here.

If the "certian" 01 TCM is a better street hotrod TCM than why havnt people reflashed their TCM's to this programming and basically have the same effect or better if i understand correctly than the valvebody mod.

[IOWA LLY]

Oh haha now i get it ):h, but what is the difference with the software that makes it so much better though?

Would this be a worth while mod to do over the valvebody? If it was i dont see why people havnt done it but there is more than likely alot more to it than were talking about here.

If the "certian" 01 TCM is a better street hotrod TCM than why havnt people reflashed their TCM's to this programming and basically have the same effect or better if i understand correctly than the valvebody mod.


Thats because the 01 TCM does not "fix" anything. Some people feel it shifts better and therefore prefer it. But an 01 TCM is not going to make your trans hold any more power.

[James Hess]

Thats because the 01 TCM does not "fix" anything. Some people feel it shifts better and therefore prefer it. But an 01 TCM is not going to make your trans hold any more power.

I understand that it wont make the trans hold more power i am just trying to figure out why it is so much better than the rest, If it is only a preferance then thats cool i was just curious.