bfdtpkt

I have a 2004 (newer model) F150 extended cab XLT step side...........
After shifting into Overdrive the transmission will jump around occasionally, causing a "jerk".
I must admit that I have 160,000 without any issues since I bought this truck new.....so I'm certainly due for a few troubles......but I've never changed the differential fluid so I made an appointment at AAMCO to replace the fluid and gasket for $89.95 this week.
Is old fluid possibly the problem or do I have a another issue?
Thanks for any help!

digitaltrucker

I think you are looking at a much greater issue and the 89 dollar service, may be a waste of time!

bfdtpkt

So do you have any idea what the "greater issue" may be??

digitaltrucker

Well at 160k and no prior attention, transmission failure.

bfdtpkt

My bad......I failed to mention that I replaced the transmission with a rebuilt Ford tranny at 99,000 with a 100,000 mile FORD warranty......so I'm not thinking it's that........

digitaltrucker

Simple then, back to ford for warranty work!

bfdtpkt

digital trucker......I think you're right, but changing the differential fluid is certainly due, also.