Swapping out a sm465

[Larry]

Looks like you have a 32 spline 208 behind a TH400 now (by the pictures in your build thread)? A NV4500 swap would be a piece of cake and your existing 208 would bolt right on. Very similar swap to what I did to my ole Polar Bear burb last winter from a 32 spline SM465 to a NV4500. The NV4500 swap starts on page 11

I've done two NV4500 swaps and '85 and later rigs are definitely much easier to do this swap.

 

[wage92]

Looks like you have a 32 spline 208 behind a TH400 now (by the pictures in your build thread)? A NV4500 swap would be a piece of cake and your existing 208 would bolt right on. Very similar swap to what I did to my ole Polar Bear burb last winter from a 32 spline SM465 to a NV4500. The NV4500 swap starts on page 11

I've done two NV4500 swaps and '85 and later rigs are definitely much easier to do this swap.

This isnt on my k5 it would be on a potential k20 i might buy

 

[Larry]

This isnt on my k5 it would be on a potential k20 i might buy

That is okay. Even a 1985 K20 with a 465 would have a 32 spline tcase that would bolt right on to the NV4500. That swap would be the exact same as my burb.

 

[wage92]

the adapter would be the same and everything?

 

[Larry]

the adapter would be the same and everything?

What adapter? A 32 spline 208 from the existing 465 will bolt right onto the NV4500 just like my 32 spline 241 went from a 465 directly onto a NV4500. You would need a NV4500 specific bellhousing though. I prefer the Advance Adapters 712576 bell kit as well as their 715535 slave cylinder bracket as it keeps the slave in the same spot as the stock 465. Lots of write ups on NV4500 swaps. Search feature is your friend here and other sites like 67-72chevytruck.com

As you can see from the 465/241 to NV4500/241 swap in my burb it was a bolt for bolt swap. No driveshaft work required, the cross member stayed in the same spot. Hell, I even used the same trans mount in the same exact spot. The only big change was the hole in the floor for the stick shift to pass through. A NV4500 into my ’78 K10 not so much….everything changed

 

[Chevy305]

Listen to Larry ^^^^^

I just did a SM465 to NV4500 swap using his build as a guide. I did a few things differently as I chose to retain my mechanical clutch linkage by using the Advance Adapters bellhousing and bracket. I had to cut a different hole in the floor for the shifter, space my tranny mounts 3" because my cross member was wrong, and put a spacer on the front drive shaft (lift/vehicle specific mod.)
Otherwise it was completely bolt on and I am kicking myself for not doing it years ago! It drives so much better, smoother, and 10000x more fun than a slush box. Also you can get a short throw shifter for the NV4500 if you get one with a bolt on shifter base. I highly recommend it