Need Help W/2-spd Powerglide Trans

[slothboy]

I Recently Bought A 68 Tempest Custom(lemans). It Has A 2/spd Powerglide Trans. It Shifts But The Only Gear That Works Is Reverse. No Matter What Gear I Shift It To It Rolls Backwards?? Need Help!

['67'cuda]

is the tranny solidly connected to the motor?

['67'cuda]

im not trying to be a dick but thats what first hit me.

What does it do in park??

[MagicRat]

Thats a good point. Have a look underneath and see if the linkage is loose.

[slothboy]

The Tranny's Conn.the Linkage Shifts Solidly Into Every Gear.the Rds Sits Tight.i Think I Have An Idea.i Haven't Checked The Vaccuum Module On The Rear Of The Tra.i Also Haven't Really Examined The Converter Or Ths Clutch Plate.the Car Was Sitting 4 Quite Some Time I Think It May Be Possible That It May Have A Build Up Of Rust.but This Is Purely Speculation.what Do You Think?any Feedback.

[slothboy]

To 67 Cuda Im Sure Your Not Trying To Be A Dick.just Because Im A Girl Does'nt Mean I Don' T Understand Cars! I'VE WORKED At A Junkyard For 4yrs.been Asst.mngr.for 3.I'VE Also Worked @ A 4-whl Dr.garage.But I Still Have A Lot To Learn!(to Clear Up Any Confusion The User Name Belongs To My Roommate!!)

['67'cuda]

its always nice to see a girl muscle car enthusiast. but maybe the gears are ground down to nothing. it sounds funny but i have grinded my auto pretty harsh one time. dont want to do that again

[slothboy]

The Only Way You Can Really Grind The Gears Down Is If You Know That Your Suppose To Shift An At.how Many People Know To Do That. People Have The Misconseption Of An At Tra. If At Were'nt Meant To Be Shifted At Diff Spd's Then There Would Only Be One Gear! The Kid I Bought It From Was A Friend,needless To Say He Loved His Car But Truely Had No Clue.

[MrPbody]

Slothboy, see the previous post on Chevy vs. Pontiac. Your transmission is not a PowerGlide, but a Super Turbine 300, used in Pontiac, Buick and Olds through the mid-60s until TH350 was introduced in '69.
Most likely, your problem is with the manual valve, connected inside, to the shift lever. One of three things has happened. The detent plate has come off due to the nut backing off. The manual valve could be broken and only moving to the first position (most likely cause), or the detent ball has disintegrated. In any case, the pan must come off to be sure. Good luck, and please, post what you find!

[slothboy]

Mrpbody Yes I Saw The Previous Post.it's Amazing How Many People Don't Realize That In 68 There Is About 12 Differnt Trans.options,and Yes One Of Them Was The 2-spd Powerglide. Which Also Came As A Stock Option In The 68 Firebird! There Were More Two Spd Tra Options Than The 3or4 Spd.

[MrPbody]

I'm not sure what you mean, but yes, GM made many transmissions. However, the PowerGlide has a Chevy bellhousing pattern and does not fit the BOP pattern. The only Pontiac in '68 that I've EVER seen with a PG, was also equipped with the 230 straight six, and was produced in Cananda. The Pontiac straight six was the OHC, and there may have been a PG option, can't say. Can say, it too, has a different bellhousing pattern than BOP V8. The base automatic in Tempest V8 is ST300. If you have a pic of the PG with BOP pattern, I would love to see it. It's a pain to adapt PG to BOP in race cars, and having one with the right pattern would be welcome. PG is one of the better choices for a light car/short race combination.

[68chevelle]

well im with MrPbody on this one. the only chevy tranny that i know of that has a dual bolt pattern and can bolt up to either is the 2004R.

At Were'nt Meant To Be Shifted At Diff Spd's Then There Would Only Be One Gear!

well then i say you should go drive down a steep hill and ignore the signs that tell you to use low gears, and drive down the hill in drive and wait for your brakes to go out form using them so much and then when you crash then you will know why they give you the option to use lower gears. and you dont totaly make sence when you say they would only have one gear. im asuing that you mean then would only have drive, and that you cant shift into the lower gears, because i hope that your not saying that they would literaly only have one gear because if you say that then your completly nuts and understand nothing about the way a drivtrain works and the perpouse it surves.

[slothboy]

im saying if you weren't suppose to shift it, they would't put the gears there. Yes, I know that g:1&2 or l is used going down steep hills. im saying that d & od are also diff. d is all time until 40-45mph then you shift it into overdrive. Im saying how many people know to do this.most people use od all the time.

[slothboy]

as far as the trans.options i will post the list of trans.the 68 tempest custom came with in 68 on mon.

[68chevelle]

umm, whats your resoning behind saying your saposed to manualy shift a automatic trans? cuz there is no problem driving around in overdrive all the time.