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677 Posts
Ok, Here's the deal. I have an ATS stage 4 transmission package in my truck. It's worked flawlessly for about 5,000 miles, when all of the sudden, it refuses to shift out of first gear until 3000 rpm, regardless of throttle position.
Things I've noticed:
1) The problem is intermittent, and fairly inconsistent. However, I've noticed a moderate load in Reverse gear will generally cause it to exhibit the problem. The problem will disappear after the truck sits for a few hours to cool down.
2) When it is having this problem, it shifts very hard in all gears.
3) I had a DRBIII hooked up to it, and the governor pressure checked out fine, as well as all the solonoids. Computer was commanding a shift from 1st to 2nd, but it wouldn't shift till 3k rpm. 2nd gear has a delayed shift pattern, also, but not as bad as 1st.
When checking Reverse, however, the DRBIII showed it to be asking for 20 psi in the governor, but the actual was at 0. The tech was unsure if this was normal or not.
4) When decelerating, the trans downshifts to 1st gear at 35 mph, just as if I'd thrown the shift lever to 1st.
5) Edge module makes no difference, settings 0 - 6 all yield the same results.
6) Co-Pilot makes no difference. Behavior is the same with the Co-Pilot on or off.
I'm not a transmission specialist by any stretch of imagination, so I'm hoping some of the gurus on this board might have some insight!
ATS has been notified of the problem, and the findings with the DRBIII. They are attempting to simulate the problem in house so they can diagnose it.
Thanks, and I'll update if I ever get this figured out!
Things I've noticed:
1) The problem is intermittent, and fairly inconsistent. However, I've noticed a moderate load in Reverse gear will generally cause it to exhibit the problem. The problem will disappear after the truck sits for a few hours to cool down.
2) When it is having this problem, it shifts very hard in all gears.
3) I had a DRBIII hooked up to it, and the governor pressure checked out fine, as well as all the solonoids. Computer was commanding a shift from 1st to 2nd, but it wouldn't shift till 3k rpm. 2nd gear has a delayed shift pattern, also, but not as bad as 1st.
When checking Reverse, however, the DRBIII showed it to be asking for 20 psi in the governor, but the actual was at 0. The tech was unsure if this was normal or not.
4) When decelerating, the trans downshifts to 1st gear at 35 mph, just as if I'd thrown the shift lever to 1st.
5) Edge module makes no difference, settings 0 - 6 all yield the same results.
6) Co-Pilot makes no difference. Behavior is the same with the Co-Pilot on or off.
I'm not a transmission specialist by any stretch of imagination, so I'm hoping some of the gurus on this board might have some insight!
ATS has been notified of the problem, and the findings with the DRBIII. They are attempting to simulate the problem in house so they can diagnose it.
Thanks, and I'll update if I ever get this figured out!