Allison 6sp: 6 speed C2 piston
- Thread starter THEFERMANATOR
- Start date
Hmm, interesting.
So, you said you could get a good 6 speed parts trans for $450? Seems like that's not a bad deal to potentially fix your problem, as well as giving an input assembly that fixes many of the drawbacks of the 5 speed assembly. I'm sure it's a lot cheaper than the parts would be new...
They charge me $450 on top of the $1500 if I don't have a core is what they wanted.
Just got the C1 snap ring on :woott:
I'd like to hear that the Transgo modifications which I just performed have been successful for others
Or should I revisit the C2 at this point...
They seem to work fine for most, but mine isn't most I guess. I would imagine you'll be fine, if not taking ito ut the second time is alot easier(seriously though don't sweat it, I think mine has underlying issues and I'm REALLY picky).
I'm ok with going into it again if there are 'issues' but I want to avoid making it a routine. Thanks for the assurance and good luck with getting yours resolved, it sounds like you have researched it thoroughly.
Ahh, that sucks. Here you could buy a core for $400. Ask your yards if they have returned cores that they would sell you for the core fee...
I've tried that and they say we have contracts with our core buyers that says we have to sell them to them. Basically they just want to get me for over $2K instead of the $500 for a core.
Well the mods I tried helped quite ab it, but I still have a slight bump on the initial 3-4 shift. I also found that my 3-4 shift is much faster and crisper now like my other shifts are whereas before my 3-4 would be very long and soft(except the initial bang). Still waiting for the rest of my manuals to come in, but I don';t think there is much I can do about this 3-4 shift. I even tried another valve body with no change in it.
99.9% certain it's not a hang up or tie up in the trans, but rather a slight delay then shifts. I can feel the defuel come in, it begin to shift, then about the time the defuel goes out it catches. Plugging the 2 orifice holes and opening the .040 01-02 center bleed hole back up in the C2 apply piston definately helped this issue ALOT(it no longer nose dives and then bangs in). It's to the point now where my wife doesn't notice it whereas before she would brace herself before it would go into 4th on the initial shift. I can even get it to do it with the truck sitting completely still by going through the gears with EFILIVE in the DVT's, if it was a tie up I shouldn't notice anything with it sitting still as the shafts are all stationary then. But I can feel it which means that the C2 is delaying it's engagement allowing the shafts to go to neutral momentarily and allow the shafts to spin until the C2 catches. That's my thinking on this. I'm going to drive it a few more days and let it fully adapt, but so far I drove it about 30 miles tonight and it shifted the best it has ever shifted. I'm probably going to try the set of stock trim valves I have just for the heck of it to see if that changes it.
If you play with the restrictors in the bottom of the piston, you must modify the return springs and the dump hole in the side of the piston or you will probably smoke the C2's in short order.
Just got the C1 snap ring on :woott:
I'd like to hear that the Transgo modifications which I just performed have been successful for others
Or should I revisit the C2 at this point...
The first trans I built (My original 5-speed) shifted beautifully after I put it back together with a transgo, among other parts from Mike...
I'm wondering if this isn't my issue with mine. I know that an 01 came with split rings, but both the ALLISON and ALTO kits for an 01 came with overlapping style rings.
Allison parts catalog PC3062EN, Service Information Letter (SIL) section SIL 41-45 tells all about the C2 piston/sealing ring type. Early 01-02s with C2 piston #29538342 (with .060" bleed hole in the bottom) used butt joint sealing rings #29538212. Later 03+ used piston #29539653 (bleed hole ELIMINATED) used double lap joint sealing rings #2953894. In the Description of Change column it states: "Improves consistency of C2 fill volumes".
Hope this helps
Hope this helps
Allison parts catalog PC3062EN, Service Information Letter (SIL) section SIL 41-45 tells all about the C2 piston/sealing ring type. Early 01-02s with C2 piston #29538342 (with .060" bleed hole in the bottom) used butt joint sealing rings #29538212. Later 03+ used piston #29539653 (bleed hole ELIMINATED) used double lap joint sealing rings #2953894. In the Description of Change column it states: "Improves consistency of C2 fill volumes".
Hope this helps
We just discussed this the other day my friend.
We just discussed this the other day my friend.
Yeah, we did, didn't we--amazing. Mike have a nice weekend and if I need a tow, I'll call you:roflmao: