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Discussion Starter · #1 · (Edited)
I’m in the process of purchasing a 69 mustang. Engine runs strong and components work properly. However, during the test drive I noticed in 1st and 2nd gear if I let off the gas pedal it pops back into neutral. From first gear at a dead stop it will Rev RPM then just slam into first gear. Once I let off the accelerated we are back in neutral. My gut tells me it needs a rebuild however it also sounds like a bad vacuum modulator valve.
Any help is appreciated.
 

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Discussion Starter · #3 ·
Check the fluid level.
Fluid level is fine. I did come across a forum with the same issue and the guys took it to a shop. The pump seal was bad. I don’t know why that would cause it to pop out of gear tho.
 
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