Quote:
Originally Posted by burnem
thanks for all the info mine is a SM420 married to a Rockwell transfer case in a 67 3/4 ton 4x4. as far as I GM did change to the SM465 in 68. I don't have any pictures of the transfer case
|
I had to look it up, I didn't know GM had a married SM420 to a Rockwell for the year 1967 only.
Up to '66 the Rockwell was divorced with the SM420
'68-69 SM465 with a married Rockwell
'69+ SM465 with married NP205
I'm a '59-66 guy, so the '67-72 is definitely not my specialty.
This thread was revived a few years ago with another member confirming how rare the 67 4wd SM420 is, and what they ended up doing.
http://67-72chevytrucks.com/vboard/s...d.php?t=531769
You might want to contact some of the members from that thread and see what they can tell you.
I haven't been able to find what the difference between the '67 SM420 (i.e. the case, output housing, main shaft, etc.) and the earlier 420's is (besides the addition of a backup light switch) or if the 2wd and 4wd 420's made in 67 are the same case etc.
If you're not able to source the correct 4wd SM420, you might be able to buy a 2wd version and replace the main shaft to the correct one (or maybe have one machined like in the thread above) for your truck, and do a rebuild while it's apart. I believe by his signature his was a 69 though, so it might not be that simple for you. Without knowing what all was changed for the 67 model it's hard to know what options you have (if any) to mix and match parts, and with parts as rare as they seem to be you might be looking for a while.
Best of luck on your search.
Daniel