[Will]

NOTE- The most important part of this post is at the end...

The T5 tranny came in many incarnations through the years in lots of different vehicles. Your best bet to get it to fit would be to swap on the tailshaft housing from an S-10 truck. The S-10 truck tailhousing is oriented straight up & down like a traditional 4-speed trans and it also moves the shifter further forward, close to where an original 4-speed for that year car would have had the shifter. If you notice, the F-body trans has the shifter mounted wayyy back on the tranny, much further back than it would have been on any '69 tranny.

If you change out the tailhousing, then you can use factory Pontiac bellhousing & linkage, everything will bolt up.

Now for the important part: If you install that T5, it won't last 6 months behind a Pontiac v8. It probably wouldn't last past the first clutch dump. There is a reason the factory only used them behind low output 305s, and now they're only found in the v6 models. Heck, they didn't even use them in the S-10s behind the 4.3 Vortech V6s. They are weak, period. You WILL grenade it, and there's not much you can do about it. The strongest models (only available for Fords) are rated at 305 ft/lbs of torque. Any healthy Pontiac V8 should make 300 ft/lbs.

Sorry, but your best bet in an overdrive 5-speed would be the Tremec TKO. Not only is it available as a direct 4-speed replacement, but it's torque capacity is somewhere near 500 ft/lbs... Unfortunately, you get to pay for the extra strength.

-Will