Re: [Classic Mustang] Re: 65 mustang speed issue...

Ok..... just a shot in the dark but this will cost nothing to diagnose. At first, when you said the car wouldn't go over 65 I was thinking something like a slipped timing chain. I've seen 289s and 302s run 2 teeth off in the retarded position and though they'll run as slow as mud, they'll run. But then I got to thinking about the heat issue and the fact it stalls when in gear but runs in neutral, coupled with what sounds like a possible vacuum/modulator problem. So here's a suggestion. Get a vacuum gauge and a repair manual (it's been so long I don't remember what to tell you what to look for but a shop manual will, someone on here will, maybe even find it online) and check for a clogged exhaust system. There is a way to check it with a vacuum gauge I just don't remember the specifics off the top of my head. An internally collapsed muffler, at least from what I have seen in the past, can give all the symptoms you describe. Too much heat at the rear of the engine but the front radiator is normal, erratic shifting because the vacuum is restricted, and stalling in drive because the back pressure is building up to the point where it just won't run with any kind of a load on it, these are all classic signs of a clogged exhaust. I haven't come across a clogged exhaust since the late 1970s when I saw a station wagon trying to go up a hill, it wouldn't go past 25 mph and sounded like a 747 trying to take off against a headwind. Take a lesson from "the voice of experience." Diagnose the problem before you replace parts. Nothing would make you throw up your hands in disgust more than replacing the tranny and still having the same problem, especially if it could be diagnosed for free with a vacuum gauge.


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