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Old 06-30-2007, 08:44 PM
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my turbo 400 won't shift!!

well, i got the very clean turbo 400 i found in a wrecked 70' pontaic
grand-ville installed in my 65' buick skylark. i found out the stock tork converter in the 400 bolts right to a second set of holes in the flywheel
of my engine, wich is the wild cat 310 (300cui) v8. we moved the crossmember back to accomidate the 400 ( my car originaly had the turbine 300 2 speed), and found a junkyard driveshaft, and we replaced the u joints
to make it fit. everything bolted right in, and fit perfect. i guess evrything went too easy. we took the car for a test ride, and found out it woulden't shift. the car sat for about 6 months while we serched for a solution to the turbine 300 not shifting, and then we found the 400, and when we got it home and opened up the oil pan, the oil looked like it was brand new, and the trans itself didint look that old, eather. we had bought a new shift modulater for the 300, and put it in the 400, it fits and looks right. the car has good vacume at the modulator. could the reason be the electronic kickdown that is
keeping the car in low gear? how does this work? does the micro swich have constant power or does the swich have a constant ground & then when the throttle is pushed down(passing gear), it powers up the kickdown. OR is it something compleatly different thats causing this problem. please help.

any info is greatly appreciated, thanks in advance

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Old 06-30-2007, 09:22 PM
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Just unhook any wire you have hooked up to the kickdown for now. The switch provides 12v to the trans connector at WOT to activate the detent mode. Unless there is an internal issue with the solenoid, if there is no power that isn't the problem.
The ST300 modulator cross references to be the same as a TH400 so that should be OK. Be SURE you have vacuum to the modulator and not a collapsed line, plugged, etc.

Next you will need to look at the governor under the small cover on the pass rear trans held on with 4 bolts.
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Old 07-01-2007, 07:58 PM
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ok, i removed the shift modulator (new) & moved the accuator back & forth
with needle nose pliers, its not stuck.

i then removed the access cover & pulled governer out of trans, the little gear and plastic drive gear look ok, no chips or wear. the wings at the cover end move freely - inside of trans looking through the cover looks spottless indecating a possible rebuild or replacement before the car i found it in was
wreked & dumped in the woods. what am i looking for that might be broken or wrong? ...- also, my modulator has a small adjusting screw in vacume
port- what is the proper adjustment and what is the proper vacume reading at idle??

thanks for all the help you've given me so far, youve been a great help
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