1971 pontiac lemans automatic transmission shifting rough


Asked by Aug 29, 2015 at 08:17 PM about the 1971 Pontiac Le Mans

Question type: Maintenance & Repair

Hello, I own a 1971 Pontiac Lemans 350 with auto transmission, the car has 85K and is in great shape and only used occasionally. As off late, when accelerating from a stop the transmission  has not been shifting from low to the next position, it feels like its stuck in low then it will slide into gear , it doesn't bang or clunk into gear it just is delayed then slides in. This has just started to happen in the last couple of days and never before. Any ideas, thanks.

4 Answers


No promises but you can try Lucas Transmission Fix Stops Slip. I have used some of there other products and they have really worked.

1 of 1 people found this helpful.

Drain the entire system, new filter and fuild, then add some lucas, it could be a cheap easy fix...

Best Answer Mark helpful

I gsve a 61 Comet and I know its expensive to do a tranny...Good Luck...


Not a question, just the solution to the transmission troubles on my 1971 Pontiac Lemans, After changing the fluids and filter and still having the same shifting problems and not looking forward to a expensive rebuild I got lucky and found a torn rubber hose on the modulator valve on the rear of the transmission. Hoping this would be the problem I replaced the hose and took the car out for a test ride and there was no change in the shifting. I then bought a new $14.00 modulator valve at NAPA and put it in with the new hose provided and the transmission runs like new. Hope this helps anyone out there with a tranny shifting problem, its worth a shot.

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