Allison 5sp: P0238, P0700, P0721, P0776 Now grinding

[pcarter6]

Well, I was coming up to a light that was changing, Known for being a horribly long light, so I hammered it. I'm on my hot street tune about a 475-500hp tune to make the light. By the time I made it to the intersection check engine light came on. It felt like a bad shift but it could have been a bump in the road.
The truck then rev'ed to the moon, I got shift range inhibited and it would not pull. I coasted to the next intersection shut the truck off and let it sit, started it up and got a bad grinding noise. I put it in drive and the noise went away, and it would pull a little again. Let off and let it coast and it would grind again. So I shut it down when i got to a safe place and got it towed and got all the codes shown above.
On a suncoast stage V with a 1058 converter with a billet flex plate and a t-case brace. Help???

Thanks patrick

 

[TrentNell]

Well, I was coming up to a light that was changing, Known for being a horribly long light, so I hammered it. I'm on my hot street tune about a 475-500hp tune to make the light. By the time I made it to the intersection check engine light came on. It felt like a bad shift but it could have been a bump in the road.
The truck then rev'ed to the moon, I got shift range inhibited and it would not pull. I coasted to the next intersection shut the truck off and let it sit, started it up and got a bad grinding noise. I put it in drive and the noise went away, and it would pull a little again. Let off and let it coast and it would grind again. So I shut it down when i got to a safe place and got it towed and got all the codes shown above.
On a suncoast stage V with a 1058 converter with a billet flex plate and a t-case brace. Help???

Thanks patrick

How does the fluid look ? do you still have 4th gear ? po776 is never good, I would drop the pan and see if its metal or clutch material or and decide from there , that code usually isnt something minor , the other codes are boost too high ( normal for aftermarket turbo trucks ) and output speed sensor range performance.

 

[Mike L.]

Well, I was coming up to a light that was changing, Known for being a horribly long light, so I hammered it. I'm on my hot street tune about a 475-500hp tune to make the light. By the time I made it to the intersection check engine light came on. It felt like a bad shift but it could have been a bump in the road.
The truck then rev'ed to the moon, I got shift range inhibited and it would not pull. I coasted to the next intersection shut the truck off and let it sit, started it up and got a bad grinding noise. I put it in drive and the noise went away, and it would pull a little again. Let off and let it coast and it would grind again. So I shut it down when i got to a safe place and got it towed and got all the codes shown above.
On a suncoast stage V with a 1058 converter with a billet flex plate and a t-case brace. Help???

Thanks patrick

P0721 is the speed sensor in your transfer case. That will cause the P0776.
Start there first.

 

[pcarter6]

Fluid looks and smells fine, Transmission was new in march 2010, maybe 15,000 miles on it, spin on changed regularly.

When I finally got it to move it would get going up to about 15-20 mph and then it stopped pulling and revved up.

Mike, could the output shaft sensor cause a grinding noise? Only at idle in park and neutral, as soon as there is a load on in (putting it in drive or reverse) it goes away.

 

[pcarter6]

Well, I stripped the P2 planatary and C2 hub splines, also one of the clutches in the c1 pack was completely delaminated and all of my c5 clutches were burnt.

Got a hold of Ron at Suncoast he is replacing the clutches on Suncoast's dime! Also he is overnighting them so I can make it to their race this weekend.:woott:

Big thanks to Ron and the Suncoast boys.

 

[1chevy02]

Good deal. Glad to hear they are taking care of you.

 

[DMAX403]

Well, I stripped the P2 planatary and C2 hub splines, also one of the clutches in the c1 pack was completely delaminated and all of my c5 clutches were burnt.

Got a hold of Ron at Suncoast he is replacing the clutches on Suncoast's dime! Also he is overnighting them so I can make it to their race this weekend.:woott:

Big thanks to Ron and the Suncoast boys.

Ouch, what usually causes this? Too much hp or just some other internal failure

 

[nate roop]

yea man, those intersections can be a doozy....
lol....get your work shoes clean?

 

[Mike L.]

Well, I stripped the P2 planatary and C2 hub splines, also one of the clutches in the c1 pack was completely delaminated and all of my c5 clutches were burnt.

Got a hold of Ron at Suncoast he is replacing the clutches on Suncoast's dime! Also he is overnighting them so I can make it to their race this weekend.:woott:

Big thanks to Ron and the Suncoast boys.

This almost always happens with tuning. You never said it didn't have 4th gear.

 

[ZeroGravity58]

This almost always happens with tuning. You never said it didn't have 4th gear.

I did the same thing to mine with the planetary and splines i also destroyed my c2's and c5's if i remember. George told me it was tieing up shifts. It was due to tuning from a previous tuner. Idaho rob fixed me up and no more problems :thumb:

 

[pcarter6]

This almost always happens with tuning. You never said it didn't have 4th gear.

I could never drive it long enough to get into 4th, it would get to about 15 mph and then just rev up, like it was in neutral.

Also would a delaminted clutch in the the c1 pack change the shift timing enough to cause the hub to strip out?

 

[pcarter6]

Also forgot my biggest props, to David and crew at Diesel Technology source, for getting it back together, Sorry David better late than never:hug: