Panning for gold
11-16-2018, 03:08 PM
#11
The new transmission is in, a GM parts rebuilt unit that came with a torque converter. I chose it because of the warranty, they had it the next day, and the dealer gave me $300 off of list price.
The reason I'm posting is to ask if anyone has any guesses as to why it shifts so much softer than the old one. The old one was not modified in any way, and I didn't change the tune. Do old transmissions shift more firmly as they age? Sounds silly to ask that. Or do new transmissions actually go through a break in period? Maybe the clutches need to wear in?
The reason I'm posting is to ask if anyone has any guesses as to why it shifts so much softer than the old one. The old one was not modified in any way, and I didn't change the tune. Do old transmissions shift more firmly as they age? Sounds silly to ask that. Or do new transmissions actually go through a break in period? Maybe the clutches need to wear in?
11-17-2018, 07:05 AM
#15
To get me on the right track Pat, are you talking about dropping the pan to adjust the pressure, or adjusting it in the tune? I expect you to say in the transmission because the old one shifted more firmly. I am not sure what to look for in the tune anyway, but I did see the maximum pressure was set at 90 psi. Won't it shifting mushy cause the clutches to wear quickly, even driving conservatively?
11-18-2018, 12:22 PM
#20
Thanks, I will take you up on that.
But for the public and me, back to my original question: Why would a stock replacement trans shift softer than a stock original trans with the same tune?
Another possibility, could debris in the circuits, maybe in the solenoids, cause the old one to shift more firmly? Hydraulics confound me.
But for the public and me, back to my original question: Why would a stock replacement trans shift softer than a stock original trans with the same tune?
Another possibility, could debris in the circuits, maybe in the solenoids, cause the old one to shift more firmly? Hydraulics confound me.
