2014 1500 with the 8 speed, 121,000 miles and owned since new. Recently I noticed the engine will surge (rpm's fluctuate) a couple hundred rpm about every 5 seconds while driving under load. It does this for the first 15 minutes. It really feels like the torque converter locking and unlocking. I've also noticed an occasional slip in the 3-4 shift at low throttle.
Once completely warmed up the issue goes away. No slip or oddities under full throttle. I changed the fluid and pan with the correct ZF variety as soon as this started happening and it made no change. The factory fluid looked brand new with barely anything in the pan and magnets.
Any ideas? I'm really concerned, especially since I have raved about the transmission in this truck for the first 120k miles. I would hate to have to replace it so soon.
Once completely warmed up the issue goes away. No slip or oddities under full throttle. I changed the fluid and pan with the correct ZF variety as soon as this started happening and it made no change. The factory fluid looked brand new with barely anything in the pan and magnets.
Any ideas? I'm really concerned, especially since I have raved about the transmission in this truck for the first 120k miles. I would hate to have to replace it so soon.
