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Old 10-21-2002, 02:20 PM
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Unhappy TH-350 Problem, HELP!

I was driving my 1970 Nova with a brand new rebuilt 350 motor and a freshly rebuilt th-350 trans with a shift kit when trouble hit me. I pulled up to a stop light, turned right and started accelerating up the hill slowly. All of a sudden it felt like the trans was in neutral. RPM's were going up but I wasn't accelerating anymore. So I let off the gas for a couple of seconds and tried to accelerate again. I started going for a second or two when it seemed like it was in neutral again. So I pulled over and tried shifting through other gears. I had no gears at all. I have park and five neutrals now, no reverse or any drive gears. Everything was new in the trans and I had just put on 120 miles that day. The first miles on the engine and trans since the rebuild. The fluid is not low and looks the same color it did when I first put it in the tranny. What is wrong with my car? Someone please help me!!!

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Old 10-21-2002, 04:24 PM
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My 78 th350 did something like that, but I did have 1st. Changed the filter and all is well, don't know if yours is going to do this but the shift kit being new may have had something to do with my trouble. I beleave I got about 250 miles before my trouble started. Let us know when you find out your problem.
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Old 10-22-2002, 02:36 PM
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you say that your fluid level and color is ok . you may want to take it back to your rebuilder and get he or she to install a pressure guage on the trans and check all the pressures. or you may want to dop the trans pan and check the manual control vavle , to see that it is not unhooked from the manual linkage, if it is not connected, reinstall the s link. the problem may also be the filter or the filter gasket, or the vavle body gaskets, maybe incorrectly installed, or your trans pump, when you installed your torque converter, did you install it all the way in. the torque converter has 2 notches in it , the notches slide into the trans pump if they dont go in properly it can brake the notch tabs on the pump and damage the pump and causing no pressure.
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Old 10-22-2002, 02:50 PM's Avatar Moderator
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I did the mis-aligned pump trick once. If the notches aren't aligned you can still torque down the converter to the flex plate 'cause it flexes but the pressure will wipe out the pump in the transmission. I don't think that is your problem though 'cause you went 125 miles before your problem showed up. Mine wouldn't shift after about 30 seconds! If it is this problem, there will be a lot of metal shavings in the pan (and throughout the transmission!). I vote for a disconnected linkage. Either way you will need to drop the pan to find out.
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