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Old 01-29-2005, 06:57 PM
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Newest Transmission problem

In my other thread, I described a problem I was having to you guys: "After an intake swap on the 454 in my 71 Nova(turbo 350 tranny) The car sould not go into gear, the shifter would move freely, but the car would not move"

Well, me and my father looked at it today and something kind of strange happened. I jumped in and tried it, and the same prublem was happening. Then my father unplgged the vacuum hose that runs to the tranny from the top of the intake. He hooked the end of the air compressor hose up to the end of the vacuum hose and let it blow a little bit. After while he was doing this, the tranny was working fine.

He figured there most be some kind of trash in the way, so he put a little more air pressure on it and then we hooked the vacuum hose back up to the intake. I tried it in the driveway and It all worked fine, it was going in reverse, drive and moving and working perfectly. Well I decided to drive the car around the block to make sure everything was Kosher. I got about 25 yards down the driveway and the same problem happened again. I was going along fine, then all of a sudden the car just stopped moving. It was the same problem as I was having before. We ran out of daylight to look at it any further, but we are going to work on it again in the morning. Any ideas as to what the problem could be before we start working on it? Could a piece of trash or something be caught in the modulator valve? As always, any info you guys can share is greatly appreciated.

Rob

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Old 01-29-2005, 07:14 PM
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You did check the fluid level!
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Old 01-29-2005, 07:48 PM
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Ya we checked the fluid level and all, and the fluid was perfect. When we were forcing air down the vacuum hose, it was working PERFECT. Even after we had blew air in the vacuum hose, it worked perfectly for a little bit, until I got to the end of the driveway. Thanks for your input stu.

Rob
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Old 01-29-2005, 07:55 PM
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The old air down the vacuum tube trick eh?

Had diddly squat to do with anything. Just a coincidence.

If you are sure there is enough fluid in it the next step is to remove the pan and check for any junk.
I have seen filters plug and this will stop fluid from being pumped. Once the engine is shut off the junk on the filter will relax enough to allow fluid to be drawn into the pump.
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Old 01-30-2005, 07:00 AM
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yea, blowing air into a vacuum tube isnt gonna have any effect of gear engagement... in fact, blowing into the tube with other end still attached to the modulator could possibly damage the diaphram on the modulator. (they were meant to handle 10-20in. of vacuum, not whatever pressure is available on tap from a compressor. 60+psi.)
u say that its full of fluid, but everything is indicating a linkage problem, or low on fluid. u are checking fluid level with engine running in park correct? if so, maybe u have the wrong filler tube for it, or the wrong stick? other than that, maybe theres no filter in it? it can have the same effect as a trans thats low on fluid.
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