What 5 or 6 speed to use?

I used a t56 from a 2001 Pontiac trans am ws6 and didn’t have to cut the tunnel, I did have to shorten the driveshaft and move my console back an inch and a half but my cars a 69 oh and I did have to open the slot for the shifter a bit but nothing major

 

I'm liking that shift pattern plate you have there. Nice finishing touch.

 

I'm running a Tremec TKO five speed. Motor pretty much built for mid range and torque rather than a big cam version. No major changes or high priced parts needed to swap except for shortening the driveshaft. Runs good with a 2:73 or 3:08 rear gear with the trans. ratios.

 

There are a few companies that offer a tremec tko 500/600 kit that bolts in without cutting. I have one from SST. But they are expensive. I think the 5 speeds from the 3rd gens bolt in, but they aren't really strong.

I really like my TKO, but if you can find a T56 used that you can make fit for cheap, they are a great trans.

 

+1 on the TKO and what was said above. A tight fit around a couple of the corners of the shifter, but overall went in pretty easily. Also recommend the kit companies like Hurst or SST at least in my experience.

Also there are a few different variants of the overdrive ratio depending on how tall you want it.

 

Thanks
It’s better now it sits flush

 

+TKO and you can re-use your original Bellhousing and manual clutch just need to shorten driveshaft and a buy different cross member.

 

Another option is the Richmond Super Street 5spd, It's one of the closest in dimensions to the Muncie's our cars came with. They offer 10 or 26 spline input and have 3 choices of 1st gear ratios and uses the "middle of the road" .77 5th gear compared to the TKO's .82 or .64.

I think all that's needed in a stock application is move the trans cross member back 2 inches and uses the same drive shaft with TH400 yoke. It's a tuff trans, but keep the rpm's under 6,800 and you will be OK.