1986 ford f150 won't change gears. Put a new motor in it and it runs in first gear and reverse. But won't get over 35 mph
1986 ford f150 won't change gears. Put a new motor in it and it runs in first gear and reverse. But won't get over 35 mph - 1
Since the motor was recently changed, make sure the vacuum line from the new motor is hooked up to the automatic transmission. It sounds to me that it isn't getting the proper vacuum level to make it shift properly. OR you may have a vacuum leak somewhere under the hood that is robbing it from the system!
A quick check for vacuum leaks is to run the engine at idle and in park. Open the hood and stick your face down in there and listen carefully all around the engine compartment Walk all around it! Listen for a hissing sound. A vacuum leak usually gives itself away by making that hissing sound.
Check the transmission fluid level as well while the engine is warmed up and running. You may also want to consider changing the transmission filter once you get it working properly again.
Yes
Bad transmission
Transmission was running fine before putting new motor in it.
The torque converter or 5he transmission pump have been wrongly installed.
Hi so you expect wonders and miracles from a 31 years old car. Well it takes more than just swapping out engines as engines need to be in such fine state to be able to be capable and after that period of time this is not going to be a lot of use.
Have you left a vacuum line off the shift modulator? Any spare hoses floating around the inlet manifold?
New motor… Professionally? If it was done by a Ford certified mechanic than we can rule out engine problems that'd cause it.engine timing, misfires, vacuum lines.etc.
As an engine wears out, it loses HP/Tq.
As a transmission ages, it loses the ability to transfer that HP/Tq
Basically if you hook a brand new engine to a 100k mile transmission, it'll probably blow the trans…
I don't know exactly but basically - Inside a torque converter is basically a fan shaped object.engine spins converter, the fluid that, basically manual fan, forces fluid through the trans.
One of the more common trans failures is that fan-like-thing inside the torque converter there wears out. So.more power than normal but a worn out torque converter. That fan-thing in there's basically churning the fluid instead of pushing it through the trans… Sort of like how your cheap-fan at home has curved blades but over time those curved blades basically flatten out.
Hard to say for sure. Any other symptoms?
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