Ram Heavy Duty Forum
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zf 8 speed
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Transmission shifting badly
Hey all, this is my first time posting here so apologies if I’m posting in the wrong place. I have a 2019 Ram 2500 6.4 Hemi with the 8hp75 trans. It’s got 78k miles at the moment. Recently I’ve noticed it is shifting a little harder at cold and operating temps, and every so often mainly around...- Lrob4
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- 2019 hemi transmission zf 8 speed
- Replies: 4
- Forum: 4.5 Gen Powertrains
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2025 8 speed - long 3rd, short 4th
2025 Ram 3500 DRW 6.7 Cummins. I can barely notice when not under load, but when towing my 3rd gear seems very long and doesn't want to shift to 4th. When it does shift to 4th it only stays for a few hundred RPM and then jumps to 5th. Maybe by design, but the irregularity between gears when...- brandontutterow
- Thread
- zf 8 speed
- Replies: 27
- Forum: 2025+ 6.7 Cummins I6 ZF 8 Speed