I will be pulling my four speed Manual transmission to see what's wrong. It will not shift into third gear. All the other's work. Near as I can tell from the serial number the transmission is a Borg Warner that was originally in a 1982 F Body.

Paging DR.ADAMS

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C3VR Lifetime Member #93
 

http://www.corvettemagazine.com/2005/july/transmission/transmission-lead.asp Hope this works...if not got to Corvette Magazine.com tech articles. Hope this helps.

 I had a 82 F-Body an IROC and If I remember corectly it had a T-56 5 Speed. I'd figure out whats in there before You  look to rebuild it. Could just be a Shifter Issue on the Outside of the Trans.

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My Car...PIC 1     PIC 2

I'm pretty sure it's from a Camaro; the serial number on the transmission is 1CL128350. It is not matching to my vehicle.

I found this post on the Chevelle forum.  If it won't go into third, I would suspect a synchro, but it could be a shifter issue, so It is worth checking first.

The 1304065903 is the number for an aluminum case Super T-10 which was an OEM GM transmission used from 1975 through the early 80's. ...
www.chevelles.com/forums/archive/index.php/t-26348.html

Larry

Otay...before ya start rippin this thing out for a rebuild, a couple of questions...
"It will not shift into third gear"...what does this mean? Does the shifter move into the third gear position, but the trans is like in neutral?
Does the shifter not go into the third gear position? Like something binding, or keeping the shifter from physically moving into that position?
Does the trans make any noise while in the third gear position?

Inquiring minds want to know!
It does appear to be a mid '80s ST10 trans, from the pics...

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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

I have lined up the linkage and eliminated that.

So it(the shifter) will not move all the way into the 3rd gear position, like something is binding, or keeping it from fully engaging?
That is definitely an internal issue. Possibly broken brass("blocking" ring/synchro ring), or the slider/coupler is damaged on the 4th gear end, which will keep it from sliding all the way rearward into third gear. This can happen without effecting 4th, btw.
Another problem could be that the "dawgs" that tension the slider, and press against the synchro rings to stop the gear when shifting can be broken, or out of place, keeping the slider from engaging 3rd.
No matter what, looks like you're gonna be doing an overhaul on it...
You can replace the 3-4 synchro hub, slider, and brass without completely disassembling the trans, but it still needs to be removed, and the gear train separated from the case.

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Joel Adams
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(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"