Post pics. Lets see how many 60-66 4x4 are out there.

[65BURB]

The Suburban is mine and yes it is real. You don't think I would leave it looking like this if slid something newer under it and/or photo shopped it. HA. The crew cab is one that I almost bought last summer.

[Franks Fab Shop]

question; did these early 60-66 4x4 transfer cases have a low gear on top of the allready "granny gear" in the gear box?
are they the same in chevy and/or GMC?

[justcuz]

Yes they had a low range. With the low gear in the 4 spd trans and the 1.96 to 1 low range it approximately doubled the low gear ratio. The Rockwell transfer case was used in the Chevy and GMC 4x4's from 1960 to 1966 in the divorced application that you have.

[Franks Fab Shop]

WOW! my buddy said his dad,as a kid, had the GMC (V-6) 4x4, that would "idle up the walls of the grand canyon" if you pointed it that way.

and i beleve him, cause my 2WD V-6 in 1st gear feels like that now!!

Thanks justcuz

[justcuz]

Your welcome. The SM420 transmission has one of the lowest first gears of a light truck 4 speed, close to 7.0 to 1. So if you double that plus multiply it by your axle ratio ye get your crawl ratio. 7x2x3.73=52.22 to 1. That is rounded up except the axle ratio which should be 3.73 for a half ton unless it was ordered with something else.

Anything over 40 to 1 is considered pretty good.

Keep in mind the new NP 241 aluminum t-cases have a 2.72 to 1 reduction ratio. So a NP 241 behind your SM420 would net you a 71 to 1 crawl ratio!

[K-TEN]

Can't speak to the later years, but the 60 and 61 K10's had a 3.90 rear ratio (3.92 at the front-they can't be numerically the same)
So 7x2x3.90 is 54.60
And the K-20's had a 4.56 rear
So 7x2x4.56 is 63.84

[justcuz]

^ Correct. I forgot that the 1/2 ton gear ratio changed in 1963 when they started installing 12 bolt rear axles. So if you had a corporate HO 33 with a dropout center section in the rear axle it was probably 3.90 and a 12 bolt would have been 3.73.

[66Gilbert]

Here are more.

[Chevymaniac]

You just can't beat the looks of some classic old iron?

Keep the pics coming.

[1tonswb]

Its been awhile since I posted this truck up. Ive done a ton of work to it since the last postings.

[wilkinst]

Here's mine:
When I brought it home:

After a little paint for immediate gratification:

[aerotruk63]

NICE LOOKING TRUCK YOU GOT. tHE STOCK LOOK IS REAL COOL.

[62 short step]

Very nice!

[JTR]

In the works build up here

[skokz]

Well half of it is 60 - 66 and the other half is late 70s.





Will be more later when it finally gets home.

[abebummy26]

here's one for sale semi local to me http://stlouis.craigslist.org/cto/1828611923.html

[j.kirn]

the suburban is sold

[abebummy26]

Where are you at in MO?

[j.kirn]

St. charles next to st.louis

[abebummy26]

Sweet I graduated from Washington High School

[brew8]

A coupla of pictures of mine, almost ready to go,

[justcuz]

Not sure if I posted these yet or not, my buddys 62, was an old Edison Co. truck.

[6722]

Here is my '61. Its on a '78 frame.

[ya it is a classic]

what the heck! you guys run out of pics?!?! ill have to go snap a pic of my freebie 66 c10 4x4. theres a reason it was free though.

[62 short step]

I posted mine earlier in this thread, but now its painted! So here are some updated pics on mine.