Anyone building SM420's near Pittsburgh?
 

I think I found the main shaft and coupler to fix my SM420. I have it partially apart , but without a press I am stopped. I am not sure how to get it apart from here. I would guess the 3rd needs pressed off? I am going to do some more reasearch , but in the meantime is there anyone in Pittsburgh , Pa area that rebuilds these? This is where I am with the trans.

Re: Anyone building SM420's near Pittsburgh?
 

You need to remove the entire main shaft assembly to remove the gears. If you have a service manual it has clear steps on disassembly. I rebuilt mine last spring with no special tools or issues, I used a rebuild kit from Novak Adapters.
If you need a service manual you can download a pdf copy here
http://67-72chevytrucks.com/vboard/s....php?p=5781194

Re: Anyone building SM420's near Pittsburgh?
 

As MJN stated the SM420 is an easy transmission to rebuild and Novak is a great vendor.
Since your already that far might as well go all the way. This video link may be helpful.

And Welcome Aboard.

https://youtu.be/6imX-_msbo8

Re: Anyone building SM420's near Pittsburgh?
 

Thanks, I will take a look.