TimberJack

Has anyone tried the HP tuners for the MP8? I bought a 2011 CHU and it’s got the 415 hp and Mack will not turn it up due to the transmission. I was gonna delete it but truck only has 56,000 original miles on it. https://heavydieseltuner.com/mack-08-13/

I washed the core out an there doesn’t seem to be one. That’s on both truck, got me scratching my head

Got 2 CHU’s having the same problems. Both Ac will freeze up. I had a problem with the drivers messing with Freon. So now they are gone I replaced driers and expansion valves pulled vacuum an charged 3 lbs. one truck the low side line will freeze from compressor to expansion valve. Doesn’t seem to be cycling. The other truck cycles but freezes the core. Does these trucks have a freeze switch like the older ones?

Well I swapped ecm from one of my other trucks an it runs fine. Looks like I’ll be buying a new ecm.

When it does it going down road I knock it in neutral truck comes to idle it want shit off with key but once it rolls to a stop it shuts off. All the dash light stays on. It will start right back up an run fine for a few mins. Yes truck is deleted. I have 3 that’s been done from the same guy with zero problems. I can’t start truck at shop it will idle then shut down. It’s got me pulling my hair out.

Seems electrical bc when you lose throttle going down road you can kick it in neutral an it will idle just fine until you come to a complete stop. When it happens you don’t even have to turn switch off it will fire right back up an runs just fine until it does it again

It’s driving me crazy!

Now it want even idle for 3 mins then cut off.

2008 chu mp8 starts an idles for about a min then dies. You can start it back up an go down road an then all of a sudden loses throttle pedal. When you pull off road an set brake truck will die. I can start it back up an it will normally run fine the rest of the day. This one is a new one on me. There’s no codes except fifth wheel solenoid.

The 18 I have came out of a Mack chu with 3.56 rears I believe, so it has the correct bell housing an top plate. I know the drive shaft with need to be redone an that’s no biggie. Only difference between the truck it came out of is mine has 3.63

It’s just a standard T310 (105yx). I’m just thinking why rebuild it when I have to perfectly good transmissions laying in the shop, a 13 and 18 Eaton. All my out Mack’s have either the Mdrive or Eaton. I swapped one years ago in a 2004 ch. it had same transmission an I put a 8ll in its place.

The 18 I have is a RTLO18918B. Yeah when the ground is really soft we normally push with dozer or skidder.

Ok thanks, this is the only Mack I have with the Mack transmission besides the Mdrive. The others have Eaton. I’ve got a 13 and a 18 was hoping to be able to use one.

Fjh it’s a whin noise, pulled back box an the bottom counter shaft tapered bearing is gone.

I’ve got a CHU with a 505 and 3.63 gears. The transmission is a T310 but started making a noise like a bearing going out. My question is how would a Eaton 13 speed do in it? Not really looking for high speed but better low rang for coming out of the woods.