Torn C4 apply

[NAFLASH]

Anyone ever seen a torn C4 apply piston from the factory?

 

[clrussell]

How many miles? I had a gm reman c3 apply take a dump at 19k.

 

[Evan@InglewoodTrans]

It's not that uncommon.

 

[greendury]

Not uncommon at all. I have seen it a lot in commercial applications.

 

[Mike L.]

Very common. Allison had a lot of problems with these pistons.

 

[NAFLASH]

122k miles. C3 and C4 are burnt. I saw a piece of rubber laying in the case after I pulled the clutches and steels. Pulled the apply piston and it was pretty obvious where the piece of rubber came from.

 

[THEFERMANATOR]

Earlier this year I had to swap one out in mine that looked just the same.

 

[Mike L.]

Allison changed the piston design in '11 because of this.

 

[NAFLASH]

C5 clutches are also burnt. I can't seem to find anyone local that has them and is open!

 

[onebaddmaxxx]

That's not common. Do you do a lot of boosting up in 1st gear?

 

[NAFLASH]

Nope

 

[Mike L.]

That's not common. Do you do a lot of boosting up in 1st gear?

That wouldn't hurt the C5.

 

[onebaddmaxxx]

I thought c1s and c5s were applied in 1st?

 

[boominator]

I thought c1s and c5s were applied in 1st?

They are

Sent from my SAMSUNG-SGH-I747 using Tapatalk

 

[Mike L.]

C5 clutches main job is to hold the P3 ring gear. Not much of a job for such a huge clutch pack.

 

[NAFLASH]

So why are they burnt? 35in tires? 540ish rwhp? Lol...

 

[NAFLASH]

C5s were burnt too. Got it all back together tonight. Suncoast gmax 6 1056 converter Goerend pto covers and Mike L PR spring.
Also had some Cal tracs laying around the shop so I threw those on too.

Thanks for all the help Mike L.!!

 

[WVRigrat05]

35's kill a trans fast, esp. With any tune. Mine will slip pretty good on my 60 horse tune in 6th already.

 

[NAFLASH]

It shifts alot better now.

 

[mike diesel]

I dont know how your c5's got burnt. I bought my truck with 33's, 139000 miles and a gooseneck in the bed. This truck did work prior to me owning it. When I tore my trans down at 143000 miles to build it, I could still read the inkjet prints on the c5 clutches no problem.