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Old 12-29-2015, 06:47 PM   #1
rgtrough
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New guy here "66 4x4 sort of

Hey guys, new to the forum but not forums. I just purchased a 1966 4X4 C10.
Yes I know. The first letter of my serial number is C not K. Thats ok the build appears to be done well. It is a 292 4 speed. This is a very solid truck. Cab, bed, frame, and driveline in very nice condition. My question for youall is about the transfer case. It only has hi (all the way up) and low (all the way back). Any idea what unit this is? Part or model numbers? Years in production?
any and all useful information is greatly appreciated.
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Old 12-29-2015, 07:41 PM   #2
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Re: New guy here "66 4x4 sort of

if it's original I think it's a Rockwell T-221 I'm sure the experts will chime in.
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Old 12-29-2015, 07:45 PM   #3
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Re: New guy here "66 4x4 sort of

Oh BTW welcome to the site and we need to see pixs, cause we all lik'em.. My truck is a 64 on a 70 4x4 frame and running with a 292 and 4 spd to...
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Old 12-29-2015, 09:28 PM   #4
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Re: New guy here "66 4x4 sort of

Pics of transfercase would help indentify it.
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Old 12-29-2015, 09:34 PM   #5
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Re: New guy here "66 4x4 sort of

X2 on pictures! And welcome aboard!
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Old 12-29-2015, 10:50 PM   #6
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Re: New guy here "66 4x4 sort of

Hey guys, thanks for the replies. I will be happy to post pictures as soon as I learn how. I don't have any photos of the truck on my computer yet.
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Old 12-30-2015, 01:15 AM   #7
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Re: New guy here "66 4x4 sort of

Hey guys, Is the t221 a constant supply transfer case? Because the one I have is.
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Old 12-30-2015, 01:47 AM   #8
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Re: New guy here "66 4x4 sort of

Welcome to the sickness! Not sure what you mean by "constant supply" but one identifying feature of the 221 is that the rear output is in line with the front output with the input shaft located above both of them. Most modern TCs have the rear output inline with the input shaft. Pics would be great when you get a chance to post!
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Old 12-30-2015, 09:28 AM   #9
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By constant supply I mean the front driveshaft turns when ever the truck is moving. No four wheel high, four wheel low, two wheel high.
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Old 12-30-2015, 09:30 AM   #10
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I will take some pictures today. That is if the sun ever comes up.
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Old 12-30-2015, 09:41 PM   #11
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I will take some pictures today. That is if the sun ever comes up.
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Old 12-30-2015, 09:43 PM   #12
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Old 12-30-2015, 09:59 PM   #13
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Re: New guy here "66 4x4 sort of

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That is the Rockwell T-221

It should have 2 HI, 4 HI, N, 4 LO

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Old 12-30-2015, 11:20 PM   #14
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That is the Rockwell T-221

It should have 2 HI, 4 HI, N, 4 LO
Where is the shifter position for 2 wheel hi?
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Old 12-30-2015, 11:32 PM   #15
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Re: New guy here "66 4x4 sort of

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Where is the shifter position for 2 wheel hi?
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All the way forward I think.
Look at this thread post #7
http://67-72chevytrucks.com/vboard/s...d.php?t=454325
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Old 12-30-2015, 11:49 PM   #16
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All the way forward I think.
Look at this thread post #7
http://67-72chevytrucks.com/vboard/s...d.php?t=454325
Thanks for the reply. The thread shows 2 Wheel Dr. all the way towards the dash. In this position when I disengage the clutch the driveshaft going to the front differential turns.
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Old 12-31-2015, 12:06 AM   #17
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Re: New guy here "66 4x4 sort of

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Thanks for the reply. The thread shows 2 Wheel Dr. all the way towards the dash. In this position when I disengage the clutch the driveshaft going to the front differential turns.
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Can you find all 4 positions? Maybe someone else will chime in
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Old 12-31-2015, 12:44 AM   #18
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Re: New guy here "66 4x4 sort of

Are your front hubs in the lock position?
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Old 12-31-2015, 12:50 AM   #19
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Are your front hubs in the lock position?
No
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Old 12-31-2015, 12:54 AM   #20
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Can you find all 4 positions? Maybe someone else will chime in
No only all the way forward (2 wd ?) neutral in the middle and all the way back (4 wd lo)?
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Old 12-31-2015, 11:48 AM   #21
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Re: New guy here "66 4x4 sort of

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No only all the way forward (2 wd ?) neutral in the middle and all the way back (4 wd lo)?
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Maybe you are in (4 wd hi)? not all the way forward?
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Old 12-31-2015, 12:05 PM   #22
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Re: New guy here "66 4x4 sort of

This pic is of a 1960 Rockwell T221. I think they're the same. My front was turning too so I had to adjust the stick shift linkage to get it into 2wd
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Old 12-31-2015, 02:10 PM   #23
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Re: New guy here "66 4x4 sort of

This pic is of a 1960 Rockwell T221. I think they're the same. My front was turning too so I had to adjust the stick shift linkage to get it into 2wd.

Maybe you are in (4 wd hi)? not all the way forward?

You both were right. This morning I jacked up all 4 corners and ran the truck in all 3 positions, with and without the front axles engaged. I had to use a pry bar to get 4 wd disengaged. Adjusted the linkage and now I have 4 distinct positions. I imagine I never got it to shift out of 4 hi after I tested it. This truck has sat in a garage for the last 7 years, only driven in nice weather.
Thanks to all who replied, you made troubleshooting this proble easier. Now on to the electrical system.
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