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Hello good people. Just joined, first time posting. I have a 72 C S, 350 with stock automatic transmission, 100K miles. Everything was running and driving fine. The fuel pump went out and so I garaged the car for about 5 months before I could get to the fuel pump. After replacing pump, starts right up every time, BUT... now I have no transmission. Shifting has no results. No fluid on garage floor. Fluid on dipstick looks clean. Worked fine before the short storage. HELP! Thanks anyone.
Is the shift linkage connected and moving the linkage at the LF side of the transmission? Have one person move the shifter and another person watch the linkage at the side of the transmission. Do this with foot on brake, no need to start nor lift the car.
I dont know if I am checking correctly. Since I cant drive it, I can let it run up to operating temp, put it in Park, and check while running. Would this be correct? Thanks
I believe what Sugar Bear is saying is without starting the car, go underneath look at trans linkage position then back in car and move trans linkage, go back under car - does linkage move? Set parking brake so car doesn’t move.
Last edited by Vintage Chief; Apr 25, 2021 at 08:14 AM.
Correct without starting the car and keeping the brakes applied.
Back in the day..."friends" used to disconnect this kind of stuff just to mess with each other.
A tech next to me did an overhaul and was putting his trademark on the nice running engine, a clean shiny air cleaner assembly when he noticed a new compression ring on his workbench😎. It definitely made him think but he was filled in quickly, we didn't let it go too far. The ring was borrowed from the parts department, they were more than happy to participate!
I’ll just mention this since it’s only too obvious. It working fine before storage. Next you changed fuel pump (OEM?), then no transmission. Double check your work area. Did you bump, move, hit, tap, remove forget to reassemble while working on fuel pump? Just seems fuel pump work is consistent with last known good operation before you changed fuel pump.
Only work area was around fuel pump replacement up front towards passenger side. Fuel lines on and off, an additional inline fuel filter installed before fuel pump. Any chance if the rubber vacuum hose on the trans shift modulator leaks, that it would cause the no shifting? Thanks
My only first hand experience regarding the ATM (Automatic Transmission Modulator) had involved inconsistent shifting at speed and not the inability of the transmission to engage. This is on my 1971 CS w/ TH350. I can’t speak directly to your application - someone will chime in. The setup on a 1972 is a little different as I recall. Isn’t there an electrical connection on yours? Trans solenoid?
When you say “leak” do you mean a vacuum leak or fluid leaking from ATM at the trans? I know you earlier stated no fluid leaks.
Last edited by Vintage Chief; Apr 25, 2021 at 09:30 AM.
Assuming it isn't something simple like low fluid level or disconnected shift linkage, your next step is to drop the pan. Verify that the filter did not fall out of place. Verify that the filter isn't completely plugged. Verify that when you move the shifter, the link from the sector inside the trans causes the manual valve to move in the valve body.
