transmission shifts out of gear at stops
09-01-2010, 11:29 AM
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transmission shifts out of gear at stops
Hey guys, same 89 f150 4x4 w/ 302.
Don't have this problem often, but when I do it's disconcerting. At stops or stoplights, I'll roll to a stop and wait with my foot on the brake. Occasionally, I can feel the truck lurch or adjust slightly and the idle increases as if I've shifted into neutral or park. After a few seconds, the truck will lurch again and the idle drops as if I've just shifted back into OD or D.
A few times on hills, I'll roll backwards a few feet after letting off the brake and stepping on the gas, then the truck decides to shift back into OD and I'll continue on my way. This happens on flat ground as well, but isn't near as nerve-wracking.
I'm wondering if this is connected to the transmission feeling like it's shifting hard or too early and killing my power output. No codes appear and my speedometer (speed sensor?) doesn't seem like it's acting up. I don't know when the ATF has been changed last, and it's a damn good possibility that the fluid is 140k mi old. I found a diagram with the trans bolt patterns so I'll get the trans model before the day is out.
Anyone have ideas or have a similar problem?
Don't have this problem often, but when I do it's disconcerting. At stops or stoplights, I'll roll to a stop and wait with my foot on the brake. Occasionally, I can feel the truck lurch or adjust slightly and the idle increases as if I've shifted into neutral or park. After a few seconds, the truck will lurch again and the idle drops as if I've just shifted back into OD or D.
A few times on hills, I'll roll backwards a few feet after letting off the brake and stepping on the gas, then the truck decides to shift back into OD and I'll continue on my way. This happens on flat ground as well, but isn't near as nerve-wracking.
I'm wondering if this is connected to the transmission feeling like it's shifting hard or too early and killing my power output. No codes appear and my speedometer (speed sensor?) doesn't seem like it's acting up. I don't know when the ATF has been changed last, and it's a damn good possibility that the fluid is 140k mi old. I found a diagram with the trans bolt patterns so I'll get the trans model before the day is out.
Anyone have ideas or have a similar problem?
