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tranny question

 
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71chevy
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Joined: 07 Aug 2006
Posts: 22

792.98 points



PostPosted: Sat Mar 10, 2007 9:55 am    Post subject: tranny question Reply with quote

I have a 350/350 with 3.08 gears. I've noticed from the point of 0-40 mph and i put the gas medal on the floor right before making final shift the engine stall for appropx. 3 seconds picks back up makes it's final shift and doesn't do it again. It's only above situation that it happens. What are you guys thoughts and recommendations?
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jeep_406
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Joined: 12 Sep 2002
Posts: 1667
Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Sat Mar 10, 2007 10:39 am    Post subject: Reply with quote

I read your post over a few times.
The only time this happens is when you are slowly winding out the engine and then floor it. If that's the case I'd check fuel pressure or look for a restriction in the fuel line. Is the fuel filter in good shape?

If it doesn't happen at other times then the accelerator pump pump is working ok. Have you checked engine timing? I'd also check vacuum lines for leaks although if they were bad you'd see the problem at other times too.

From what you write, I don't think the problem is in the tranny.
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71chevy
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Joined: 07 Aug 2006
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PostPosted: Sat Mar 10, 2007 12:13 pm    Post subject: tranny Reply with quote

yes that's the only time it occurs. if it was a restriction wouldn't it do it more often.
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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
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PostPosted: Sat Mar 10, 2007 3:49 pm    Post subject: Reply with quote

Running out of fuel makes engine run lean and could back fire or pop if lean enough. If you are accelerating hard enough to uncover the jets it would act the same. Ignition and fuel problems act alike and often mask each other.

The TH350 uses a vacuum modulator and governor setting to determine a down shift to bring up engine RPM to accelerate. If you have a vacuum leak in the line to the tranny the modulator would think you have your foot in it all the time and shifts would then be controlled by the governor and line pressure.

What you are describing sounds like a bog (not enough fuel to cover the amount of air entering the motor). If you have a vacuum secondary check for an accidental screw insertion in the secondary throttle plate slot. Verify your accelerator pump is working correctly (have no idea as to what you have for a carburetor). If you have a vacuum controlled advance distributor (on an older car or aftermarket) make sure it is functional (not stuck where it will not move).

There could be several factors so we would need more info to narrow it down.

Big Dave
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