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Old 11-03-2018, 02:35 PM   #1
feller
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Will a 205 hold up?

Just thinking about a possible future project, and I don't have any of the parts. But I am thinking about doing a k40, or k50 build (67-72 vintage) possibly (probably) a crew cab. My question is if I went duramax and either a zf6 or an allison, if I found a way to mate a 205 would it hold up? I would like it to remain passenger side drop and use as many Chevy parts as possible. Also would an nv4500 be a transmission option? Just thinking about this and am open to any ideas or advice.
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Old 11-03-2018, 04:28 PM   #2
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Re: Will a 205 hold up?

when I was entertaining a Dmax/Allison swap into a 71 K20, I found nothing on the shelf to hook up to an np205..

called several vendors, advanced, dirty laundry or something, diesel experts something, etc.. nothing allison to np205..

a saavy vendor down south recommended to look for later model mopar stuff, np 241 or something like that, also RH drop..

gal on the phone and her husband in the background spent at least 10 minutes giving me a laundry list of specifics..

still need adapters and speed sensor mod, etc.. couple of $k but at least doable..

I decided against it, not enough time for all of that, sounds like a good job for retired folks

here's the engine/trans I was looking at 07 LBZ Duramax 6 speed Allison

good luck!

eta: found my scratch paper..

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Old 11-03-2018, 08:56 PM   #3
feller
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Re: Will a 205 hold up?

Sheesh!
Thanks for the info, it sounds like dodge or Ford axles, or a divorced transfer case would be better or cheaper. I guess it wouldn't matter and I would probably be the only one who knew. Another option might be a k4500 rollover and just do the frame swap I'd gain IFS from that
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Old 11-05-2018, 06:36 PM   #4
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Re: Will a 205 hold up?

You can get a 241d transfer case that was used in 86-93 gas 3/4 and 1 ton dodge trucks. This is a RH drop tcase and if you did do a NV4500 you can put the 29 spline input in it. I've heard of guys putting 208s behind allisons with upgraded guts so they can keep rh drop. If I was building a true K40 or K50 I'd be using non 8 lug stuff to stay true to it's rating but that is just me.
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Old 11-05-2018, 07:38 PM   #5
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Re: Will a 205 hold up?

Dont know how to hook it up but, found a cool truck that you might want to take a look at basically the same thing with 2wd https://www.bismanonline.com/baker_m...dually_duramax
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Old 11-05-2018, 08:03 PM   #6
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Re: Will a 205 hold up?

these guys offer allision to np205 products and shifter cable brackets . https://precisionfabricationplus.com/

but there prices are CRAZY high . lots of there stuff is 2x the price / labor of offroad design stuff . but some stuff ord dosnt offer .

there is a guy on the other site that got there cable bracket kit . he was thinking there ally to 205 kit also but for the same basic money he went off road design MAGNUM BOX doubler . since the magnum box uses round 6 pattern it will bolt to about any trans easy . then the np205 bolts behind it with a new input gear that eliminates a coupler sleeve .

gets you 1:1 / 2:1 / 2.72:1 / 5.33:1 / TRUE 3 speed box .

http://offroaddesign.com/catalog/Magnum%20Box.htm
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Old 11-05-2018, 10:21 PM   #7
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Re: Will a 205 hold up?

A Dodge 29 spline from a First Gen cummins/getrag truck will bolt up, though I believe needs to be clocked.

I chose my LB7/Allison/29 spline np205 first with the GM D60. It would need a higher lift than I intended for my crew build. I wound up finding a Ford HP 78-79 D60 and Ford np205. I bought a kit with clocking ring and 29spline input to change the ford case. The ford D60 will help clear the offset oil pan, and get the truck lower to the ground.
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Old 11-10-2018, 01:35 AM   #8
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Re: Will a 205 hold up?

Even if you get the NP205 mated up to the Allison, you still have to overcome the issue with the VSS to get it to play nice with the Allison TCM in 4low. Why not use a 2wd Allison and divorce mount the NP205? That way the VSS sensor can stay in the trans and there will be no issue. The 2005-2008 Kodiak's that where 4x4 I think that had a divorced transfer-case setup...not 100% sure though.
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Old 12-31-2018, 06:59 PM   #9
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Re: Will a 205 hold up?

Quote:
Originally Posted by 1972K20 View Post
Even if you get the NP205 mated up to the Allison, you still have to overcome the issue with the VSS to get it to play nice with the Allison TCM in 4low. Why not use a 2wd Allison and divorce mount the NP205? That way the VSS sensor can stay in the trans and there will be no issue. The 2005-2008 Kodiak's that where 4x4 I think that had a divorced transfer-case setup...not 100% sure though.
I'm pretty sure they did and I think they used NP 273s but I'm not 100% sure on that.
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Old 01-04-2019, 07:51 PM   #10
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Re: Will a 205 hold up?

Sounds like a cool build to me . I'd like to do similar. I'd like to build something 4500 or 5500 ish with a c50 cab and big fenders on it . I'm thinking f550 chassis. It's plenty tough . Has much bigger than 1 ton axles , 19.5 wheels etc. And junk blown up 6.0 superdutys are everywhere cheap. I'd like to do a cummins build. Motor mounts etc are easily available for that chassis and cummins drive lines are the proper side drop for that axle and t case . Koop us posted ��
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Old 01-06-2019, 04:08 PM   #11
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Re: Will a 205 hold up?

So what is the best trans/transfer case option for a cummins swap for a crew cab? So much info on this topic....
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Old 01-07-2019, 11:40 PM   #12
Dieselwrencher
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Re: Will a 205 hold up?

I'm not sure there is a best really. Personal preference and parts availability has a lot to do with it. Just my .02.
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Old 01-08-2019, 07:42 AM   #13
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Re: Will a 205 hold up?

The Allison will hook up fine to the 29 spline np205, there are a couple adapters for the job on the market. You will need more lift on a GM Dana axle then Ford axle. The oil pan is offset to clear a driver side driveshaft. There is a guy who sells an aftermarket oil pan for clearance though. As far as getting past the 4 Lo/Reverse issue, you put the VSS in the tailsection of the Tranny and not in the tcase. Trevor
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1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks)
1972 Jimmy (soon to be Hickey cloned)
1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track)
1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank
1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT)
http://67-72chevytrucks.com/vboard/s...d.php?t=624819
1989 V3500 Crew Cab (454tbi, NV4500, np205)
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:2004 Jeep Wrangler Rubicon (daily driver)

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Old 01-09-2019, 12:19 AM   #14
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Re: Will a 205 hold up?

The Kodiak xfer case was a divorced mounted NP271. It is rare as hens teeth and the input parts are discontinued. I tried to find one about 5 years ago and gave up.

As far as transfer cases go the NP271/273 are stronger than a 205. They are beasts. My Dodge 5500 has been putting over 1000 ftlbs though one for the last 10 years. Truck is a G56 (6spd manual) with a dual clutch and factory 4.44s. Wieghs 12k empty and has grossed 36k for thousands of miles.

Alot of people talk down on the Dodge 241s also. My 95 2500 still has the original case (non HD so not the wider chain) at 320k and needed rebuilt, still does, when I bought it 100k miles ago. It is still kicking behind a 750 rear wheel HP 12 valve. The NV4500 was making death noises under boost so it got swapped for a G56. Ironically the NV4500 is now in my DD 72 K20 with a built 400SBC with no issues. I guess it was just to worn out for holding 1500 ftlbs of torque.
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