My thoughts are GO FOR IT. Are you asking for specific details of the swap or just opinions on going from an auto to Muncie?

 

Yes I would like to know more about the pilot bushing and steering column for starters

 

In my book, the only correct transmission for a Chevelle is a manual, such as a Muncie. A 5-6spOD is also OK.
The image of a Chevelle as a muscle car, performance car, just DOES NOT fit with an auto tranny!

 

With 3.73 gears take a look at a 5 speed. On the highway you will be glad you did as you go into 2.80 or so final drive equivalent.

 

I have 3.73 gears and this is my first conversion so I’m looking more into the tranny choices (leaning towards a Muncie).

 

I agree - go for it. I've done a few over the years and always happier after the conversion. As Lew540 said, with 3.73 gears strongly consider the 5-speed.

 

The TKX with .68 overdrive. It's been redesigned to fit the tunnel without any cutting

 

Modern 5 or 6 speed is life altering. Swapped my Muncie for a .68 OD :TKX in my GTO…

 

Modern 5 or 6 speed is life altering. Swapped my Muncie for a .68 OD :TKX in my GTO…

Modern 5 or 6 speed is life altering. Swapped my Muncie for a .68 OD :TKX in my GTO…

How was the installation as far as fitment and alignment? What about hood clearance?

 

68 GTO, original 4 sped car, about 5 minutes works to mod tunnel near the shifter opening. No other clearance issues. Added a G force crossmember to get away from the rubber mounted clam shell style mounts, moved back a few inches, made the trans concentric with crank, made an modern HD shorter driveshaft and that’s about it. Plug and play for the most part.

 

Make an honest assessment on how you are planning to use the car - if you want to stick with the 3.73s and plan to drive the car on the highway frequently, you'll want the o.d.
My car stays in town, only drive it when I want to get my ya-yas out - I wouldn't dream of swapping out my muncie.

 

I would stick with an auto, to be honest my 66 four speed is a pain in the city. It’s three shift up and down between lights. It gets old after 7 - 8 lights, and on the hyway another gear would be nice to keep up with current hyway speeds, without reving to 4 grand +. The ease of driving for a cruise would make it worth it.

 

Had a Muncie. Now a TKO 5 with 3.31 rear. Love it.

 

If you are going to do the entire switch put the 5 speed in it. Is it a little more expensive - yes. I have a gear vendors behind a Turbo 400. The GV is either automatically turned on at about 45 or so or you can do the dimmer switch on and off. So on highway I occasionally do a test life before/after with the dimmer switch. I had no OD for about 30 years and for the last 10 or so I have had one and it is great it really helps on the highway. As one guy said above what do you want and do with the car. Down the road it can also help with the resale of the car.

 

Maybe so, BUUUUUUUUUUUUT, I'm 81, new knees, and I'm still banging my Muncies and the Richmond 5sp in the Cutlass.

 

I bought my current Chevelle to build a clone of my first Chevelle (‘67 L78 with Muncie 4 speed , 4.10 posi), BUT I ended up buying a really nice mostly original car with a TH400 Automatic with column shift.

I’ve pretty much decided to just enjoy it as it is, despite having all the parts for my ‘67 L78 engine build including a rebuilt Muncie M-20 & Hurst comp shifter. I even have the 4-
speed conversion kit.

Converting to the 4-speed just seems like a lot of work now that I’m not in the best of health and the current ‘67 is so nice as it left the factory, numbers matching car and all.

I definitely would prefer something other than the original non-posi 2.73 diff however. 🥴

I’m learning that the Turbo 400 isn’t all that bad, but for me I think I’ll always miss shifting!

 

I TOTALLY UNDERSTAND AND AGREE!
But, as long as I am able (even less efficiently these days), I'm not ready to hang it up. It's harder to do things and it takes longer, and that's OK. I enjoy DRIVING (I am NOT a cruiser!!!) and I much prefer a manual tranny. We have an '04 Impala SS and '12 Tahoe that we bought new. The ONLY reason that they do not have manual trannys is because they were NOT available. Especially the Impala SS. An Impala SS is just plain wrong with an auto tranny,
Oh well-------------------
I thoroughly still enjoy building engines, Muncies, rearends, doing brake and suspension work, and as long as I can turn a wrench, I'll find a way to keep doing it.
My oldest son and I recently built an awesome roller cam SB400 for his 73 Vette to replace the tired numbers 350. It was just a great time and showing him how to build an engine from scratch, fresh from the machine shop.
Soooooooooo, if it's what you enjoy doing, keep doing it!!!