workingdog
GOLD Star
Okay, I need help. I've tried everything.
this is a 6.0/4L80e. I used to all run flawlessly until I put tons under it over the winter. The only change to the drivetrain was putting an Atlas on the back. Otherwise the motor and transmission were unchanged.
But, as soon as I took it for it's first test drives, the transmission would keep getting hotter and never cool down. Trans guy did a flow test and a test drive and said it was all good. But, when I got it back, it was still doing it. My son took it on an all day and there was clearly something wrong, the transmission was failing.
So, we removed the trans, took it down. One of the clutch packs was toast, the metal ring was hanging up on the case and could not fully move, causing heating. So, full rebuild with new billet torque converter - and in it goes.
Driving around town, it's been doing okay, but today I took it on a 2 hour drive over the same mountains twice. First pass it got to 180/210. It's interesting that it's getting warming going down hill with no load and it takes a long time to warm up - a good 45 minutes. The second time over the mountains engine and trans got to 230. The engine came right back down after we crested, the transmission took a long time to get back to 180. It only cools on level ground with part throttle. No throttle and it does not cool. it stayed between 180 and 210 the rest of the way home on flat ground.
My understanding is that's too hot for a 4l80. I have the biggest cooler you can fit. It's huge. My understanding is I should be seeing 140 most of the time and occasionally hitting 180 under load.
I'm out of ideas of what to check next. I'm thinking I'm going to have to take it somewhere expensive and have them figure it out.
this is a 6.0/4L80e. I used to all run flawlessly until I put tons under it over the winter. The only change to the drivetrain was putting an Atlas on the back. Otherwise the motor and transmission were unchanged.
But, as soon as I took it for it's first test drives, the transmission would keep getting hotter and never cool down. Trans guy did a flow test and a test drive and said it was all good. But, when I got it back, it was still doing it. My son took it on an all day and there was clearly something wrong, the transmission was failing.
So, we removed the trans, took it down. One of the clutch packs was toast, the metal ring was hanging up on the case and could not fully move, causing heating. So, full rebuild with new billet torque converter - and in it goes.
Driving around town, it's been doing okay, but today I took it on a 2 hour drive over the same mountains twice. First pass it got to 180/210. It's interesting that it's getting warming going down hill with no load and it takes a long time to warm up - a good 45 minutes. The second time over the mountains engine and trans got to 230. The engine came right back down after we crested, the transmission took a long time to get back to 180. It only cools on level ground with part throttle. No throttle and it does not cool. it stayed between 180 and 210 the rest of the way home on flat ground.
My understanding is that's too hot for a 4l80. I have the biggest cooler you can fit. It's huge. My understanding is I should be seeing 140 most of the time and occasionally hitting 180 under load.
I'm out of ideas of what to check next. I'm thinking I'm going to have to take it somewhere expensive and have them figure it out.