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Old 08-07-2007, 04:50 AM
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Transmission ID

Hi~
What would be the quickest way to ID my transmission? It is in a 68 Cutlass Convertible, 2 speed behind a 350 2bbl......From previous postings I understand it would not be a Powerglide, 350 or 400......Thanks!

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Old 08-07-2007, 05:22 AM
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Tranny Id

The way to ID a tranny is the shape of the pan a 350 pan is square with one corner cut off a 400 has a wild looking shape you can google these shapes and ID them easy. good luck
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Old 08-07-2007, 05:52 AM
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Thanks....but I knew that, it is niether a 350 or 400 and I do not see a similar shape when I see the pix on the web......where do I start???
Appreciate the comments!
Steve
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Old 08-07-2007, 06:03 AM
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Check this posting,
700r4 or 350 lockup
I responded with a couple of charts which may help you id your tranny.
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Old 08-07-2007, 06:31 AM
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Original engine and trans in the car?

a 2 speed in the 1968 Cutlass is a Super Turbine 300...

this has been discussed before also.

Similar to a powerglide , yet very different.

T-350 trans were NOT released to the public yet in 1968
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Old 08-07-2007, 06:42 AM
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Thanks for the charts and the info but again, no pix of a st300, how can I positively ID it is a st300? I can not find pan pix anywhere. To the best of my knowledge motor and tran are original.
Thanks again.....any perception of my being obtuse are unintentional!
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Old 08-07-2007, 10:22 AM
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http://www.autotran.us/gmABpg26.htm
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Old 08-07-2007, 12:06 PM
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trans id

boese 1978, please know that I am not insinuating that you are either obtuse, nor did I draw a conclusion that you were slow-witted, but it's easier for a smart person to act dumb than it is for a dumb person to act smart

If you have a 3 bolt governor cover on the left side of the trans. and a servo cover on the right side that is 2 and 3/4 inchs in diameter. you have a ST-300.
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Old 08-07-2007, 12:13 PM
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No insinuation taken! I was just keeping things light! I appreciate the input. Now, having determined that it is a st 300 I have a few questions...first- I replaced the ujoints this past weekend and found that the tail shaft ( with the splines) is loose, I can move it up and down about 1/4 inch inside the tail housing, Is catastrophic failure imminent? Second- with this tranny should it kick down when I kick it down on the acclerator? Third- I would like to keep the car pretty much original, is this tranny a decent one to rebuild, are there shift kits available??? any other feed back will be appreciated. Is there a manual anyone could recommend for this tranny, I like to read but would probably not tackle a rebuild, motor yes, tranny no.....
Thanks
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Old 08-07-2007, 01:54 PM
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St-300

The output shaft on this trans will move a lot, [ with driveshaft out ], the movement you feel is not a concern, IMO.

No kickdown? Check for voltage at the connector on the left side of trans, key on and have someone floor the gas pedal. You should show 12 volts.

If not, there will be a kickdown switch on the gas pedal or near the carb, I don't remember which, check to see if you have voltage going in and voltage going out.

This is a good trans. easy to build, easy to firm the "SHIFT" up in, by simply drilling one hole in the separator plate [on the valve body ], and adjust band at 3 turns, tweak the modulator a bit and Presto, there you have it!!

Don't know of a manual available, after all it is almost 30 years old, darn there I go again. If I keep this up no one will ever believe I'm only 29 years old
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