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Old 01-06-2008, 07:05 PM
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Turbo 350 Leaking & Kickdown Problems...

In my '56 Chevy pickup with 350 V-8, Blue Racer Wolverine dual-stage cam and Edelbrock Carb, my Turbo 350 tranny has the following problems: I leak upwards of a quart of fluid out of it after it sits for a week without being started. Under moderate throttle, when the transmission upshifts, it will shift from 1st to 2nd, then hit third almost immediately. It's not staying in 2nd very long at all. Also, the kickdown cable is hooked up but there are no WOT downshifts at any speed and the WOT upshifts occur at exactly 4000 RPMs when left in "Drive". I have my kickdown adjusted to where the cable is pulled to the end of its travel at WOT. I have an adjustable modulator and the vacuum supply for it goes to the manifold behind the carb. Also, on occasion, when putting the trans in (any) gear right after starting the engine, it will sit there and not go into gear until you rev it up once or twice. Trans has a B&M street-strip shift kit, fluid is not discolored or burnt. It has been rebuilt once after having bought it from a rebuilder. I am using a stock torque converter. Sorry for the long post, but wanted to describe everything in case one problem could be related to another. Any help for this "newbie" would be greatly appreciated!

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Last edited by onefine56; 01-06-2008 at 07:15 PM. Reason: Revised to add torque converter type
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Old 01-06-2008, 08:11 PM
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Quote:
Originally Posted by onefine56
In my '56 Chevy pickup with 350 V-8, Blue Racer Wolverine dual-stage cam and Edelbrock Carb, my Turbo 350 tranny has the following problems:

I leak upwards of a quart of fluid out of it after it sits for a week without being started.

Under moderate throttle, when the transmission upshifts, it will shift from 1st to 2nd, then hit third almost immediately. It's not staying in 2nd very long at all.

Also, the kickdown cable is hooked up but there are no WOT downshifts at any speed and the WOT upshifts occur at exactly 4000 RPMs when left in "Drive". I have my kickdown adjusted to where the cable is pulled to the end of its travel at WOT.

I have an adjustable modulator and the vacuum supply for it goes to the manifold behind the carb.

Also, on occasion, when putting the trans in (any) gear right after starting the engine, it will sit there and not go into gear until you rev it up once or twice.

Trans has a B&M street-strip shift kit, fluid is not discolored or burnt. It has been rebuilt once after having bought it from a rebuilder.

I am using a stock torque converter. Sorry for the long post, but wanted to describe everything in case one problem could be related to another. Any help for this "newbie" would be greatly appreciated!

The B&M shift improver kit; were there springs in this kit for the governor? IF the springs were installed, change back to the OEM springs.

Leak: converter drain back is common when setting. Check for leaks in filler tube at case, detent cable to case , shifter link arm, etc.

Trans Not going into gear brings up the pump. IF the pump gears side clearance is too high, the pump will actually drop pressure to zero when a high demand is put on it(dropping into "D")...I've watched this happen on a trans dyno. Extra pump gear clearance will also increase drain back from the converter when the vehicle sits for along time (several days to a week)


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Old 01-06-2008, 08:28 PM
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Quote:
Originally Posted by Crosley
The B&M shift improver kit; were there springs in this kit for the governor? IF the springs were installed, change back to the OEM springs.

Leak: converter drain back is common when setting. Check for leaks in filler tube at case, detent cable to case , shifter link arm, etc.

Trans Not going into gear brings up the pump. IF the pump gears side clearance is too high, the pump will actually drop pressure to zero when a high demand is put on it(dropping into "D")...I've watched this happen on a trans dyno. Extra pump gear clearance will also increase drain back from the converter when the vehicle sits for along time (several days to a week)


You bring up an interesting point. The guy that rebuilt the trans did not put a new pump in it. Also, interesting you mentioned the O-ring seal on the dip stick. I just replaced it last weekend and it seems to have helped a little. When he installed the shift kit, I am not sure if he put the kit springs on the governor or not. I will replace the springs this week and will update you with the results.
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