[PONTIAC LARRY]

Originally Posted by Mwieczorek

Like the title says, I'm considering a 4 speed swap. I know the buckets and center console are likely unobtanium, and I'm fine with keeping the bench seat and running a simple floor shifter. with that said...

It appears that there was a longer version of the Muncie for large Pontiacs with a tailshaft P/N of 9779246. It looks like I need to find that specific transmission, but wanted to double check with the experts. Is that correct?

Also, is there anything different functionally about an earlier or later version of the Muncie? Does it make a difference if the transmission is from a 64, 66, or even a 68? I know there were improvements made to the transmission over its life and a later one is likely better, but if I find an earlier one will it still fit?

Also, what about pedals and linkage? Is there B body specific stuff that is unobtanium, or is it the same stuff as an A body? Can I use parts marketed for the GTO?

What about the shifter? Is there anything special about it, or should a shifter marketed for a bench seat Impala do the job?

I'm hoping to get an idea of how tough the parts will be to source before I buy anything. If its going to be difficult to impossible to find the parts I'll just deal with the TH400 for now.

I did try the search function before asking, but I didn't find the answers I was after.

Thanks!

Also don't forget a 3 something gear ratio needed for 4 speed since most common 66 auto cars have 2.56 (Catalina 2v) 3.08 3.23 minimum. Also I would consider a much newer 5 speed to see viability of swapping in and gain OD and maybe a deeper first gear. Aftermarket universal hyd clutch (hyd throwout bearing) set up can save you messing with unobtanium dinosaur stuff. If you find a deep gear 5 spd you may only need a 2.93 posi or something milder to get a good stop light drive away gearing in 1st.

[Mwieczorek]

Originally Posted by PONTIAC LARRY

Also don't forget a 3 something gear ratio needed for 4 speed since most common 66 auto cars have 2.56 (Catalina 2v) 3.08 3.23 minimum. Also I would consider a much newer 5 speed to see viability of swapping in and gain OD and maybe a deeper first gear. Aftermarket universal hyd clutch (hyd throwout bearing) set up can save you messing with unobtanium dinosaur stuff. If you find a deep gear 5 spd you may only need a 2.93 posi or something milder to get a good stop light drive away gearing in 1st.

Yeah, so now that I've done more research I'm leaning towards what you list above!

First order of business is to source a rear end with respectable gears and limited slip. I'm going to start a new thread to solicit information about suspension geometry...

Thanks!

[PONTIAC LARRY]

Originally Posted by Mwieczorek

Yeah, so now that I've done more research I'm leaning towards what you list above!

First order of business is to source a rear end with respectable gears and limited slip. I'm going to start a new thread to solicit information about suspension geometry...

Thanks!

your 66 gear interchange is between 65-70 full-size Pontiacs B body big 10 bolt cover that has a 12 bolt ring gear 8.875" 31 spline bolt in axles.

Great donor cars are Bonnevilles or Grand Prixs or Catalina 2+2 cars or any factory manual trans equipped car ... these will have a lower ratio than the average
automatic 389-2v Catalina or Star Chief.