I have a 1980 gmc with a 350 motor, th350 tranny, and a np205 t case. is it possible for me to divorce the t case from the tranny? if so, what parts would i need to be able to do this. the t case is the "racetrack" style input.

Thanks

I have a 1980 gmc with a 350 motor, th350 tranny, and a np205 t case. is it possible for me to divorce the t case from the tranny? if so, what parts would i need to be able to do this. the t case is the "racetrack" style input.

Thanks

you would need a divorced Dodge transfer case.

you wouldnt be able to put yokes on the end of the output and the input shafts and have a short driveshaft in between?

oy.

oy.
what does that mean?

you wouldnt be able to put yokes on the end of the output and the input shafts and have a short driveshaft in between?

No... like Grumpy said, you'd need a divorced 205. Since Chevy never used a divorced setup, you'd have to get one from a Dodge or International. You will also need to convert your 4x4 TH350 over to a 4x2 TH350. You'll need change its tailhousing and tailshaft (I think... not sure about tailshaft). If you're not up on all that, it would probably be easier to just swap out the 4WD TH350 with a 2WD TH350.

well, lets see.... look at the input shafts in this photo...
see any threads to retain a nut?

There is a 5 ton military over on mountaineer.com. I bet that might hold up

I have a 1980 gmc with a 350 motor, th350 tranny, and a np205 t case. is it possible for me to divorce the t case from the tranny? if so, what parts would i need to be able to do this. the t case is the "racetrack" style input.

Thanks


why?

and as mentioned, you need to get or convert to a 2wd trans, get a dodge case, they pop up often enough.

I've got a divorced Chevy case. Then again, it's also got 32 spline fr/rr 1350 yokes, and a 32 spline 1330 input. I've got a divorced D300 as well, but that's a whole nother story.

WHy would you do something that retarded?

I've got a divorced Chevy case. Then again, it's also got 32 spline fr/rr 1350 yokes, and a 32 spline 1330 input. I've got a divorced D300 as well, but that's a whole nother story.

if its a chevy divorced case, either it came out of an international, or a dodge.

GM didnt use a divorced case 205 in any vehicle i have seen. they used 30 spline or 10 spline front outputs, where as the cornbinder and dodge used all 32 spline stuff... its the same case, just has non GM application...

what was the original application?

I've got a divorced Chevy case. Then again, it's also got 32 spline fr/rr 1350 yokes, and a 32 spline 1330 input. I've got a divorced D300 as well, but that's a whole nother story.

if its a chevy divorced case, either it came out of an international, or a dodge.

GM didnt use a divorced case 205 in any vehicle i have seen. they used 30 spline or 10 spline front outputs, where as the cornbinder and dodge used all 32 spline stuff... its the same case, just has non GM application...

what was the original application?

Since he said he also said he has a divorced D300 (which never occurred in production that I know of) and said "that's a whole nother story", I'd say he alluding to some custom one-offs.

no need to custom shit. dodge cas 2wd tranny simple and easy



its a good way to get a longer front drive shaft and clock the case if you have a super ghey florida truck. it has its purposes.

if its a chevy divorced case, either it came out of an international, or a dodge.

GM didnt use a divorced case 205 in any vehicle i have seen. they used 30 spline or 10 spline front outputs, where as the cornbinder and dodge used all 32 spline stuff... its the same case, just has non GM application...

what was the original application?


Short story is that I didn't have room for a divorced 205, due to the castings taking too much room. I redrilled the face to take a rear bearing retainer and seal, plugged the racetracks exposed holes and filled it with ford guts. Held in by a rear plate and mounts off the PTO and side brace bolts.

And you're right Mechanos, the D300 is another custom jobbie for a 2wd conversion where I couldn't get a 205 in

No... like Grumpy said, you'd need a divorced 205. Since Chevy never used a divorced setup, you'd have to get one from a Dodge or International. You will also need to convert your 4x4 TH350 over to a 4x2 TH350. You'll need change its tailhousing and tailshaft (I think... not sure about tailshaft). If you're not up on all that, it would probably be easier to just swap out the 4WD TH350 with a 2WD TH350.

Chevy did use a divorced setup. All Napco conversions were divorced. So were Chevy factory 4x4's till 66. I think 67's were divorced with a Rockwell or Dana t-case. In 68 I think they were all married and have seen Rockwells married to 4spd truck transmissions. We had a little 76 shortbed when i was at El Toro. It had a 6, 3 speed and a smaller t-case than the Rockwell in my 63...maybe a Dana? Seems I have seen some info somewhere were they used Dana's in the late 60's Chevys.

So were Chevy factory 4x4's till 66. I think 67's were divorced with a Rockwell or Dana t-case. In 68 I think they were all married and have seen Rockwells married to 4spd truck transmissions.

My 61 has a devorced rockwell.... But your right there were some married ones in the late 60's.

what does that mean?

It means your over your head and should stick with what you can buy out of a JC Whitney catalog....

Chevy did use a divorced setup. All Napco conversions were divorced. So were Chevy factory 4x4's till 66. I think 67's were divorced with a Rockwell or Dana t-case. In 68 I think they were all married and have seen Rockwells married to 4spd truck transmissions. We had a little 76 shortbed when i was at El Toro. It had a 6, 3 speed and a smaller t-case than the Rockwell in my 63...maybe a Dana? Seems I have seen some info somewhere were they used Dana's in the late 60's Chevys.

key to the whole thing here is the term "NP205". not a rockwell.... the bearing retainers on the Rockwell 221 were potmetal, and are harder to find parts for than hens teeth.

a six cyl 3 speed could have had either an NP205 or a dana 20. both combinations were available.

Yea, I know. My response was geared to Mechanos saying "Since Chevy never used a divorced setup". The point is never say never unless you are sure.

Bingo on the Rockwell bearing retainers. The intermediate one wore out in mine as I recall. Was hard to find parts for even in 74!

The 67 had the Dana 20 in it. I was still in possession of my 63 at the time and was surprised how small the t-case was on the 67. Looked just like a divorced Jeep T-case, except I had never seen a divorced t-case in a Jeep until the M715.

Was 68 the first year all Chevy t-cases were married to the transmission?

no they wernt all married till 70.

mechanos wasnt saying that chevy never used a divorced setup, just not a divorced 205.


no you have brought up somthing i have never heard of, chevy using a dana tcase. i have seen a few 3spd, and a few 4spd a833 hooked up to tcases but never had a chance to check them out.

Was 68 the first year all Chevy t-cases were married to the transmission?

That's what I want to say but just like the 10 bolt/d44/12bolt there was some overlap grey area with chevy.

That's what I want to say but just like the 10 bolt/d44/12bolt there was some overlap grey area with chevy.

x2

'68 was the first year chevy started using married t-cases...but still used divorced ones as well. my '69 gmc came with a married SM465/ Rockwell T221. I know some '68s used a married SM420/T221, and most other 69's have the 205. It appears to be whatever was left in the parts bin.

On the small t-case, I have seen a number of 69-72 and a couple 73 and up K5's with the Dana 20 t-case, married to the 3 on the tree or SM465. Never seen that in a truck, just K5's. Most of these were base model no option straight six trucks, but a couple did have factory small blocks. I don't really know what the idea was behind using this t-case, but whatever.

As far as the chevy divorced NP205's, I am pretty sure there are a couple out there somewhere. Napco made 4x4 conversions well into the 70's...and I'm fairly sure a few years ago I looked at a '72 C/30 that had been a Napco convert...and I *think* it had a divorced 205...but those trucks also used Dana 24's and Rockwells, so I am not sure.

I saw a married Rockwell, which I had never seen before or even knew exhisted...intill I saw the picture. In a 68 shortbed 1/2ton with a 327 and a 4spd, dana 44 front and 12bolt rear.

Not sure of the Dana 20 applications. The one on base was a 6,3spd, Dana 20
A very light duty little pickup we used to use to tow the big wheeled extinguishers around with on the flight line. Had a Co2 cylinder the size of a welding tank and a purple K cylinder with about 150 lbs of agent in it.

flight line equipment is a world of its on, i wounldt be totaly surprized to see a cummings 3spd with a 1 speed full time tcase in a airport rig. but i dont think that their stuff was factory as in rolled of the gm line, like the mill tugs with air bags, zf axle and full hydro.

stuff like that is typicaly from aftermarket chassis companies.

For the most part your correct. This was just a little light duty pickup with a pintle hook on the back to tow those big extinguishers around with. We had some other stuff that was very specialized.

...As far as the chevy divorced NP205's, I am pretty sure there are a couple out there somewhere. Napco made 4x4 conversions well into the 70's...and I'm fairly sure a few years ago I looked at a '72 C/30 that had been a Napco convert...and I *think* it had a divorced 205...but those trucks also used Dana 24's and Rockwells, so I am not sure.

Well, there ya go. Chevy never used the divorced 205... Napco did.

Well, there ya go. Chevy never used the divorced 205... Napco did.

napco may have done custom 4x4 stuff but they only built the production line of chevy 4x4's till 59, 60 was the first year chevy produced it own 4x4 and has from then on. and afaik they used the 221 also, but i havent seen to many inperson.

napco may have done custom 4x4 stuff but they only built the production line of chevy 4x4's till 59, 60 was the first year chevy produced it own 4x4 and has from then on. and afaik they used the 221 also, but i havent seen to many inperson.

The Rockwells were standard fare for the divorced era 60 to 66 and I think we may have established some divorced Chevy's till 70. Napco was a dealer installed 4wd system till 59. Shipped to the dealer in a wood crate. After that they were used on 1 ton and above 4wd applications. Not sure about the assembly locations on these or the transfer case used.

BTW if you are interested in Napco stuff they have a website and some interesting vehicles pictured there. Also a youtube video of a completely off road Pikes Peak climb done by an early Chevy Napco pickup as an advertisement for the durability of the vehicle. Kinda cool.

after chevy dropped them they started making some real cool ford stuff to, there is a few collector sites as well.

I had a 63 Chevy 1/2 ton 4x4 that had a Rockwell transfer case that blew out the rear output shaft. I limped it home with front wheel drive and then found a mystery divorced transfer case at a used parts place. They didn't know what it was but said it came out of a 50s Chevy and only wanted 100 bucks for it, and it was in very good condition. It only took an hour or so to make it mount up and it worked great. I traded that truck soon after because it had a single reservoir master cylinder for the brakes and no e brake that worked and I figured let someone else deal with that. That truck had stock 8 or 10 inch(stupidly big) blocks on the rear axle too. They leaned a little and would not straighten up when I tried to fix that. But since I got it for 200 bucks with a dirtbike included in the deal I wasn't complaining. http://i157.photobucket.com/albums/t75/bbigtn/backinDay004324x475.jpg

The 66 ran a Timken 221 t-case. It's nice to see other folks wanting to go divorced. Definitely solves a few issues. I put a divorced NP205 from a Dodge into my C-10 as part of my 4-wheel drive conversion.

The 66 ran a Timken 221 t-case. It's nice to see other folks wanting to go divorced. Definitely solves a few issues. I put a divorced NP205 from a Dodge into my C-10 as part of my 4-wheel drive conversion.

rocwel and timkin are the same, alot of duece axles are labeld timkin as well.

the 221 case was a rockwell. the bearings were Timken...