WTB Rockwell T221 or NP205 for my '69 K20
 

Western SD. Looking for good used Rockwell T221 or a good used NP205 with the adapter and sleeve for my '69 K20 with an SM465. Has a Rockwell in it now, but having problems with it. Any help or advice on the Rockwell/NP swap suck as driveline mods, spline counts, etc would be appreciated also. Money's tight, but spring is here and I need my 4WD working!!!

"such" LOL

I am in the process of swapping my T221 out for a NP205, behind a SM465 in my GMC. If I had a good solid day of nice weather and no work/school, I could get it done, but no such luck.

What you will need for the swap:
-NP205
-adaptor
-bolts for adaptor
-coupler sleeve

To make things a little easier, I took the seat out of my cab and unbolted the high floor hump. Removed driveshafts, front is a ***** to get off.

Now its time to unbolt the Rockwell...I decided to take the transfer off first, and then the adaptor (separately). there are 6 bolts that are around the perimeter of the adaptor, take those off.
then you will notice a little access cover on the drivers side of the adaptor w/ 2 bolts holding it on, take those off. You will uncover a small cavity, there are 2 more bolt heads inside here that you must remove to get the transfer off. This took me a real long time to figure out, why the transfer wouldn't come off. make sure you don't get your wrench stuck in the cavity.

after that, it should come off fairly easy. make sure you take the speedo cable off before you drop the case...lol.
i found out that all the bearings and seals in my transfer had gone bad, but i think its rebuildable...oh well. i also discovered that the coupler sleeve and the transmission output were both pretty worn :mad: so I will have to replace the transmission sometime in the future, too.

now comes the FUN part...you will have to unbolt the crossmember and the torque bracket from the frame, and move the whole thing back approximately 1-1/2 inches. this isn't an exact measurement, I would recommend bolting the NP205 adaptor to the transmission and crossmember, and then marking where the bolt holes are.
then drill the 8 holes out, having a right angle drill will make life easier for the bolts on the upper part of the frame. then bolt the crossmember up to the frame.

this is as far as I have gotten, the NP205 is ready to go in, just waiting for some nice weather (working out in the driveway and i'm picky, lol). from observing what has happened, I expect to have to get my rear driveshaft shortened and my front lengthened. ideally, i'd like to find a 1 piece driveshaft from an original SM465/NP205 truck, as my truck came stock with a 2 pc, but I will have to keep looking. also, the shifter will come up on the passenger side of the hump, not the drivers side, so you will have to cut a new hole.

i think that is all, if you have any more ?'s feel free to ask.

EDIT: just remembered...good luck finding an NP205 or Rockwell. They seem to go for quite a bit of cash. Same with the SM465/NP205 adaptor.
I was lucky and got (2) NP205's, (1)4x4 SM465, (1) adaptor, and (1) like new coupler sleeve for a grand total of $30....so the good deals are out there. However, I was quoted up to $175 from this board just for the adaptor, so I would advise you to shop locally if possible.

Another note, some 1970 trucks had an NP205 with the shifter on the drivers side, you could find one of those and forget about cutting your floor hump and relocating shifter.

Yet another note, SM465/NP205 adaptors from '73 and up trucks are stronger than the older versions, in case you wanted to be lazy and forgo reattaching the torque bracket.

I have a 68 3/4 ton I am parting out the drivetrain....it has a 3 speed manual trans though....maybe someone from the board can tell us if the transfer case will work for you. Also willing to let the axles go, front is a closed knuckle dana 44...haven't checked on the ratio yet...just glanced at the rear, must be a 44 or a 60, it is not an eaton. Have front and rear driveshafts also. Make me an offer if your interested.

Does this truck have manual or power steering?

72gord, the transfer case will be the same but the adapter will not be correct. The adapter between the T221 and 3 speed is longer than the adapter between the T221 and the 4 speed. The tranny end is also shaped different.

Erl, it has power steering and 4wheel drum non-boosted brakes, 350, 4.56's w/ a Dana 44 in front and an Eaton HO52 in the rear.

Yukon...thanks for the info, that helps

Erl...if your talking about the truck I'm parting out, it has manual steering

Thanks, Gord

rockwell
 

:D How much is it worth? Priceless when it takes 5 years to find one. I have a spare for my 69 K20 If you remember these were only used when GM went on srtike and new process stopped shipping to them (about 2 mounths in 68).

Re: rockwell
 

Sorry to burst your bubble, but GM 4x4's used the Rockwell transfer case from '60-'69, both divorced and married. All 60-66 trucks used a divorced style, and 67-69 used both.

The only exception to this would be Napco trucks, which used Dana 23, Rockwell, and NP205 transfer cases.

The NP205 was introduced in '69.