2012 LML I had the trans rebuilt by copperhead diesel performance. However with the rebuild it has more line pressure causing more heat. I have 37s not towing and after a 15 min drive my trans temp is 190, I live in Arizona ambient temp is 115 pretty much all the time. It’s causing hard shifts into converter lock when it’s hot. Is there a good upgraded trans cooler available? I still have the stock cooler and I was told that it’s not in the “danger zone” so don’t worry about it but no one else I know has this issue I’ve seen the PPE bar and plate cooler does it work well? Should I add a switched 800 cfm cooling fan? Any advice would be appreciated!
ISO upgraded LML trans cooler
- Thread starter ChaseTimmick
- Start date
No your temps aren't high, but to me that's high for such a short drive. I'd suspect they didn't flush the cooler properly during overhaul
So do you think buying a mishimoto or Ppe cooler would be worth it
Remember the engine radiator shares a cooler with the transmission. This will cause heat from the engine to heat the transmission fluid until the transmission and engine are about the same temperature. Having the transmission at or near the engine temperature is normal
It might help, but I'd make sure the coolers were hot flushed first. Like I said, temps aren't abnormal but that seems excessive for a 15min drive
Coolant temp sticks around 185
So the stock cooler should be able to keep up with the higher pressure?
Per the dash or a scanner?
My dash doesn’t show exact but the gauge sits right below 210 and scanner gives me exact temps when I switch to tow haul to help drop the trans temp my coolant temp gets to 190-195
There's a couple guys that live down in AZ, maybe they'll chime in. If it gets to 200F but stays there that's fine, to me that is climbing a little fast but 20min in stop n go traffic I could see that. 20min cruising, no.
Depending on how the transmission was setup when built, and if they bypassed the EPC, you could benefit from a transmission tune that still utilizes the EPC to drop pressures when at low throttle. 200F should not be causing hard shifts though
Depending on how the transmission was setup when built, and if they bypassed the EPC, you could benefit from a transmission tune that still utilizes the EPC to drop pressures when at low throttle. 200F should not be causing hard shifts though
Sean at copperhead is good friend of mine. He does not build crap transmissions, only does a few a year because he does not want to be known for transmissions, just diesel work and knows his stuff on them. He does use a hot flush on the trans coolers and uses goerend converters. Hes on the opposite side of town from me but we talk and share stuff all the time. Im just putting that out there before we go jumping off the “blame the builder” bridge.
You are absolutely fine. That is 100% common. 100* over ambient is to be expected here and yes, even after 20-30min. You will see higher in traffic and 110-120* heat because the asphault super heats the air and is closer to 140-150* air temp at 3-5pm. Mine will run 210-220* even with a setrab cooler but im running 330psi line pressure
What size build did you go with? You most likely have an epc blocker inside and im sure he verified with you that you do NOT have tcm tuning for pressures.
Can you add a cooler? Absolutely. Do i think you have an issue? Nope. Converter lock up is going to be aggressive. Again, part of that can be due to the build you chose too
You are absolutely fine. That is 100% common. 100* over ambient is to be expected here and yes, even after 20-30min. You will see higher in traffic and 110-120* heat because the asphault super heats the air and is closer to 140-150* air temp at 3-5pm. Mine will run 210-220* even with a setrab cooler but im running 330psi line pressure
What size build did you go with? You most likely have an epc blocker inside and im sure he verified with you that you do NOT have tcm tuning for pressures.
Can you add a cooler? Absolutely. Do i think you have an issue? Nope. Converter lock up is going to be aggressive. Again, part of that can be due to the build you chose too
I’m not blaming anyone I love the trans and the guys at copperhead are great I have no complaints. I’m giving all the information I have so that I can get accurate info back. It is heat related the hard shifts into converter lock do not start until it gets over 195 prior to that I have no issues at all. I have all the receipts that I can get all the details from but it’s 750 ho capable triple billet disk converter