Rockwell transfer case ?

Gibby1 · Oct 21, 2009

I found an SM420 mated to a Rockwell Transfer case. From what I've been able to find, these are pretty strong, they have the passenger side drop and centered rear that I need.
What I don't know is how LONG they are and I can't find that info anywhere? This is of a 1960 Chevy 3/4 ton, still running and driving, that's being parted out. The only diagrams I can find seem to show that it's a fairly long transfer case. Anyone familiar with these? I am putting this in the Willys so it can't be very long or I won't have a rear driveline.

Thanks for any help.

PUO-BANNED · Oct 21, 2009

might be a single speed case.

Gibby1 · Oct 21, 2009

PUO said:
might be a single speed case.

From what I've been able to read, they are a 2 speed transfer case, but I've not been able to find the gear ratios yet.

PUO-BANNED · Oct 22, 2009

is there a plate on the case to i.d. it? probably a 221 with 1.94 low range.

PUO-BANNED · Oct 22, 2009

look like this?
http://www.pirate4x4.com/forum/showthread.php?t=86600

Gibby1 · Oct 22, 2009

I've not seen a picture yet, just the ad. The t-case is still in the truck which the seller is trying to sell whole but will part it out.

It's not easy to get info...

I found that thread while doing some homework, but thanks for the link.

dja410 · Oct 22, 2009

These are awesome cases talk to willysredneck on here he runs one in his and so does another guy in the club and the out putt is on the bottom to so it gives you a good driveline angle to.

CHOP SHOP · Oct 22, 2009

B i g h u g e t r a n s f e r c a s e

tomsbrokeagain · Oct 24, 2009

:scratchhead:I haven't heard of a SM420 with a mated transfer case IIRC.

I believe all SM420 were divorced.

Gibby1 · Oct 24, 2009

I just picked one up. SM420 mated to a Rockwell. Got a schweet deal on it. Shifters, bellhousing all included.

A little cleaning, a front seal on the rockwell and a gasket and it's good to go.

Gibby1 · Oct 24, 2009

PUO said:
is there a plate on the case to i.d. it? probably a 221 with 1.94 low range.

T221-N7 with a 1.94 low range.

pokey · Oct 24, 2009

Had the same set up in a 69 blazer. Never had any issues with it althouth the low range is a bit high.

Gibby1 · Oct 24, 2009

pokey said:
Had the same set up in a 69 blazer. Never had any issues with it althouth the low range is a bit high.

With the sm420 granny gear and 4.56 gears in the diffs, I don't think it'll be too bad. I don't know what low gear in the sm420 but I think it's either about 6.38 or 7.2. At least those numbers ring a bell for that transmission.

They're both pretty short which is great and I like the low output on the Rockwell. Not to mention the PTO output for future options.