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Old 04-23-2018, 08:51 PM   #1
1968_K20_4x4
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Full time axle to locking hubs

Hey all,

I am going to do an axle swap on my truck. The truck is a 68 K20 with a Dana 44 front axle. I have a crack in my diff, and so I'm looking to swap out to a new axle with disk brakes and open knuckle. I have found an axle i like, it is a dana 44 out of a 76 K20 military truck. It has my gear ratio and is in good shape. However being military it is a full time axle. My question is, can I reuse the locking hubs I currently have on my truck and install them on this new axle? Is it a strait bolt on deal?

Thanks
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Old 04-23-2018, 09:29 PM   #2
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Re: Full time axle to locking hubs

I've swapped a few...just remove the slug gear and install the locking hub..
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Old 04-23-2018, 09:47 PM   #3
Mike C
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Re: Full time axle to locking hubs

If it's the Dana 60 which the military truck should have had then you will need to buy hubs for a 60 and not the Dana 44 hugs. I think your original hubs are the external ones on the K20 and are not compatible with later stuff. But maybe?

If memory serves thought, the 77 model year was the first for the K30 though, but that's what all the Military trucks were I thought?

But 60's bring big bucks so maybe something else was swapped in to sell the truck again?

Cliff Notes version: Early K20 hubs different than later K20 hubs which are same as K10 hubs. K10 hubs interchangeable all years, Dana 60 gets it own hub.
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Old 04-23-2018, 10:06 PM   #4
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Re: Full time axle to locking hubs

he is in canada and there gm military trucks were not like our trucks .
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Old 04-24-2018, 08:35 AM   #5
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Re: Full time axle to locking hubs

Yep forgot to mention but Im in Canada, and the axle is definitely a D44. Most of the axles that I have found in my serch all had a 4.10 gear ratio, but this one has the 4.56 gearing I need to match my rear end. I was just wondering about the hubs... if it was as simple as just removing the full time hub and bolting on my locking hubs or if there was anything else I had to do to the axle to make it work. Sounds like it should be a simple bolt on swap, which is what I wanted to know before I go ahead and purchase the new axle. Thanks for the replies everyone!
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Old 04-24-2018, 09:16 PM   #6
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Re: Full time axle to locking hubs

It would be if you didn't have an older large hub K/20. The small K20 hubs, which started in '76, are the same as K10. You'll need to come up with some lock out hubs. But that is all that is different. The whole full-time deal is the NP203 transfer case. There were conversion kits to correct that blunder, which involved a parts to swap out in the transfer case and a set of lock out hubs.
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Old 04-26-2018, 01:09 PM   #7
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Re: Full time axle to locking hubs

Making a 205 out of a 203 is like trying to make a silk purse out of a sows ear. Better try to find a 205 to put in there.
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Old 04-26-2018, 05:38 PM   #8
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Re: Full time axle to locking hubs

Quote:
Originally Posted by Peanutbutter View Post
Making a 205 out of a 203 is like trying to make a silk purse out of a sows ear. Better try to find a 205 to put in there.
and drive shafts for length difference . and shifter .

maybe he is just trying to keep it simple and on budget .

only real down faul to 203 is the chain . the gear box section in front is super strong .
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Old 04-27-2018, 02:01 AM   #9
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Re: Full time axle to locking hubs

We won't sweat the small stuff, its worth it to have a 205. I put the conversion in a 203 years ago and still didn't like it, that's why I have 9 or 10 205s for spares. Probably never need them but just like lookin at'em.
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Old 04-27-2018, 05:48 PM   #10
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Re: Full time axle to locking hubs

I know . I have 205's in my k30's . and 5-6 extra cases to clean and sell . and some extra guts also .

2 of my k30's have the best of both . . . 203/205 .
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Old 04-28-2018, 09:45 AM   #11
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Re: Full time axle to locking hubs

I never owned a truck with 203 in my life. That's because I never liked them from the get go. Gears don't stretch and slap the case. If I was doing a doubler I'd probably go Dana 300... all gear.
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Old 04-28-2018, 12:56 PM   #12
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Re: Full time axle to locking hubs

Quote:
Originally Posted by special-K View Post
If I was doing a doubler I'd probably go Dana 300... all gear.
? ? ?

how is a 203/205 doubler not all gear ?

and dana 300 is a smaller box over a 205 .
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Old 04-28-2018, 11:43 PM   #13
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Re: Full time axle to locking hubs

I'm sorry, I didn't realize I needed your permission to have my own opinion. Is there anything else you feel the need to educate me on that I already knew before I formed my opinion? If a 203 is not chain driven but all gear then thank you for teaching me something new. Musta made a wrong turn at that sign that said Pirate 4x4.
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Old 04-29-2018, 10:44 AM   #14
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Re: Full time axle to locking hubs

wow never said you were wrong or should never be done . just pointing out a few things incase you didnt know since you SAID i have never owned a 203 case .

i DONT wana fight or piss off anyone here . i was just pointing out a few things was all . i guess you took it wrong .

-----------------------------------------------------------------------------------

a 203 is chain drive i am NOT saying it is not . but the chain drive is for the front output only . the reduction is gear drive in the front half . looks almost like a 205 inside . pics posted .

a 203/205 doubler mates the best part of a 203 the RANGE BOX to a 205 and gets you a super strong combo with 4:1 low with both in low.

pic 1 &2 = np203 range box gears . same size as a np205 basicly .
pic 3 = offroad design doubler kit mated to the 203 range box ready to bolt a 205 on the back .
pic 4 - 5 = whole combo bolted up and ready to install .
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85-c10sb summer fun toy .
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EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 04-30-2018, 07:53 AM   #15
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Re: Full time axle to locking hubs

Sorry if I took you wrong or you took me wrong. I was referring to the chain drive of the 203 as one reason I never liked them. I have owned the unit, one came laying in the back of a '71 3spd Blazer I bought years ago. I guess the P.O. had plans to do a swap of some sort. I've installed I don't know how many part-time conversions back in the day as well. Back when trucks were coming out with this set-up a friend had a '79 K20 I loved. It was two-tone grey, lifted a few inches at spring shop, 9.00-16s on stock wheels/hubcaps (in '79 it was all about flash in the magazines), and a 4 x 6 tube rear bumper (laid flat & black w/angled red safety stripes) with angled drop down diamond plate to the Reese hitch. I wasn't hot on new trucks back then, especially because of the full-time deal. But his was the one that taught me you could still get a TH400/205 with lockout hubs. I loved that truck wicked bad! He had the 350 a bit warmed up, too. I always had trucks/Blazers with NP205 and am a big fan of them.

I ended up putting a TH350/NP205 in the Blazer. I learned about brownie gear set-ups when in Oregon and it had me thinking about coupled transfer cases. I had a friend who's dad machined parts for NASA and other such outfits in his little old mountain machine shop. That is where I was first dazzled at the capabilities such a shop had. His dad made parts for his MX bike that put him over his competition. This was late-70s. The fact that his dad would make tools to make tools and such madness as that led up to the end result of coupling a Dana300 to the divorced NP205 in the '69 W200 Power Wagon I had put a Dana60 front axle under. Dougs dad made the coupler parts for the Dana300. The truck was a billy goat back in the day of chrome roll bars, graphics paint jobs with crushed velvet interiors. It was when 4wds were catching on with the van crowd converts and all the arguments were about Ford vs Chevy and Jeep had their "We wrote the book on 4wd" motto. I was all about that Dodge being the underdog. My reply to the Jeep guys who liked to quote that motto was "And Power Wagon taught Jeep how to write" . I'm just reminiscing now, back to the day when mfgrs were marketing 4wds for comfort & convenience and the trends were about cosmetics. I'm glad to see things go to maximum capabilities these days, but I can't even go on Pirate because I'm not 100% up on everything these days and I don't need the punkass attitude that site spews.

Sorry for being testy. I was just stating my feelings on the NP203 to all and didn't see the need for a direct response from you, as if I was only talking to you. If I saw it all wrong I apologize.
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Old 04-30-2018, 08:06 AM   #16
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Re: Full time axle to locking hubs

we cool man

and for the record i HATE rough country lift kits the same way you dont like 203 t-case .
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77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 05-01-2018, 09:12 AM   #17
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Re: Full time axle to locking hubs

I never hold a grudge even if my wittle feewings were huwt.

I liked Rough Country in the mid-70s when Tom Cepek had that Tan & White F250. There were not the options that are out there today. Of course, my first K/20 got Burbank Springs and I have never ran a Rough country lift or shocks. That Blazer had Rancho and that '69 Power Wagonddn't have a lift kit. No one made one for one thing. It was pill the springs, disassemble, Pound out your desired arch with a sledge hammer on an anvil with your buddy squeezing on that leaf with all he had or he'd get a bigass OWIE! First main arched in comparison to the other original, arch rest of pack to fit, then do the other side to match. Made the 4" pipe bumpers and a front brush guard out of 3/8" plate & 2.5" tube just to middle of grille with a third tube at bottom so tow hooks wouldn't bend the side-plates in...like the store bought 1/4" plate/2" 2 tubes would.

My buddy was selling at Carlisle just what I needed to do a repeat of that doubler set-up...minus the custom machined parts! He brought a divorced NP205 w/crossmember and bought off someone a collection of a couple variations of the Dana300 for cheap. I haven't checked, but Advance Adapters may offer what is needed now. The second pictures has the 300s lied up out front behind that group of buyers
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GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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Old 05-01-2018, 09:06 PM   #18
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Re: Full time axle to locking hubs

thats not a divorced np205 . i thats a older np202 case . the pto area is wrong for a 205 .

no prob . love a good story and feedback on old parts we liked or didnt like.

here is my custom made bumper i just made a few weeks ago . c-channel and 3x3x5/16 angle for brackets.

and here is a divorced dodge 205 case i did up for a guys truck with around 19" lift and 44" tires in pic got replaced with 46" few days later .
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85-k30lb the plow machine build .
85-c10sb summer fun toy .
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Old 05-01-2018, 09:18 PM   #19
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Re: Full time axle to locking hubs

I found this on the 202...[ I know IH and dodge used them]

The NP 202 is a through drive transfer case that is dimensionally about the same size as the NP 200. Most people prefer the NP 205 to the NP 200 as the 205 is also a through drive ddesign but the NP 202 input and output shafts are a good 1/4 inch larger in diameter and the gears measure a good 3/8 thicker and the frount output shaft rear bearing cap is iron instead of aluminum. They used these transfers in 1 ton and 1 1/2 ton and 2 ton and maybe 2.5 ton IH trucks but I am not for sure on that one. The transfer has the same lowrange as the NP 205 and NP 200 but it also has a neutral position so you can use the PTO outlet on the 202 and speed up and reverse your winch with your transmission. Internally this transfer makes the 205 and 200 look puney.
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Old 05-02-2018, 09:01 AM   #20
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Re: Full time axle to locking hubs

You're right. It's the IH/Dodge unit, not what I had in my '69. Not mine and I never looked it over other than a glance when I saw it at Carlisle on his spot. He still has it. I could get it for $300 or so if anyone is interested
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