79 k10 transfer case help

[JJV]

i just boughta 79 k10 shortbed 350 turbo 350 and np 203 transfercase i bought the it didnt have a front driveshaft i got a front drive shaft off a 86 k10 with the 208 transfer case i put it on and 2 miles down the road it starting making a banging noise i really want to know if the driveshaft out of balance or bad u joint or the transfer case is the problem what other transfer case can be swapped in to replace np 203 or what other problems could it be

[GreaseDog]

did you lay the driveshafts side by side? are they even close to the same length? what's the condition of the shaft you installed? ujoints, cv, slipshaft all in good shape? are you sure the joints on the end of it are correct for your application? sure the bolts are all tight, and joints centered? you've got a lot of checking to do...

[JJV]

thanks for info man i had wrong length driveshaft i got a new one and it fits fine but this morning i drove it across the street to get gas and realize i has in 4 hi the front driveshaft wasnt hooked up i thought the np203 can only move in 4 hi loc without the front shaft also it was grinding on the way back i drove it 4 miles it still have automatic hubs on it im confuse about this transfer case last two k10s i had the 208 case so im new to this 203 case

[~Super~Midget~]

every 203 case i've seen has already had a part time kit in it, giving you 4 high - 2 high - N - 2 low - 4 low, i've gone thru several in my 77 and haven't got my hands on one yet that wasn't already part timed, an original 203 truck didn't have "automatic" hubs it had slugs that left them engaged 100% of the time, if it has actual automatic hubs then i'd say its been part timed and they went with auto hubs instead of manual hubs

[JJV]

it does have the slugs looking hubs on it im going to get manuel locking hubs and put in it but as i was working on it i installed a new front driveshaft and doesnt matter which range im in 2wd or 4 wheel drive it makes a banging noise like its hitting againt something i looked underneath it nothing is its way from i notice as my brother drove it up a little bit it was coming from where you bolt in the shaft to the tcase with front shaft off it drives good anything else i need to look i will take it to transmiison shop and let them check out the t case see if anything wrong with it

[GreaseDog]

do the caps say "4x4" on them or are they just smooth caps?

[JJV]

Smooth caps

[FordeatinZ71]

sounds to me like you have a grenaded t-case. probably the "differential" inside the t-case is shot...which would be the REASON the front driveshaft was removed...it's called "polishing a turd"...it was done so they could get more money out of you. anyhow, you got a '79 K-series so you got a great truck...just put in a NP205/208 (205 is strongest...has no chain drive, is gear to gear) and start loving your new rig!f you. anyhow, you got a '79 K-series so you got a great truck...just put in a NP205/208 (205 is strongest...has no chain drive, is gear to gear) and start loving your new rig!

[JJV]

alright i have a buddy that has a 208 transfer case hes taking out his 86 k10 hes swapping to a turbo 400 and 205 what would all i have to change if i got the 208

[FordeatinZ71]

honestly not sure, never done that swap. but i wouldn't think you'd need anything other than possibly the trans. adapter and the proper length driveshafts...

[JJV]

10 4 I seen the adapter kit on summit racing so I will check that out and go from there I really appreciate yalls help

[~Super~Midget~]

is the truck lifted any?

[GreaseDog]

Smooth capsthen you do no have automatic locking hubs... the auto hubs say "4x4" on them, where the drive slugs mentioned before, are smooth chrome caps.

[GreaseDog]

alright i have a buddy that has a 208 transfer case hes taking out his 86 k10 hes swapping to a turbo 400 and 205 what would all i have to change if i got the 208what trans does his 86 have in it? i'm thinking you may be able to get away with a 350/700 to 208 adapter, the case, and the driveshafts from a 350/208 equipped truck.

[JJV]

I have 4 inch rancho lift on it and the 86 has the 700r4 transmission I can get that too but I would like to keep the turbo 350 me and 700 r4 don't get along lol

[FordeatinZ71]

that's fine. he was talking about using the adapter for the t-case out of a truck with a 700R4, not the transmission...but, for what it's worth...i've had lots of gleeful miles with 700R4s under vehicles i've owned...good transmissions...

[JJV]

Alright I get the tranny too and get the adapter and see if it works woukdnt hurt having the 700 r4 laying around in the shop I get it rebuilt later on

[FordeatinZ71]

a 700R4 can be a tough transmission when built right...with a decently low 1st gear and the benefit of OD.

[~Super~Midget~]

i know my 4" lift came with instructions to grind the droop tabs off the drive shaft, they will cause one hell of a racket, i didn't need to but i know some people that have

[GreaseDog]

you will kill a 700R4 if you try putting a 700R4 in a stock K10 on big tires. just like the factory "problematic" 700R4s, it will be grossly undergeared. you need to be turning at least 1500 RPMs at speed.

[Jon4x4]

my 78 had a np203 with no issues. but it does say it should have 2hi and what not. i only found 4hi n and 4lo.

[vic_V8]

my truck popped a lot, it was due to the lift, the front shaft was hitting the crossmember, check that out too.

[FordeatinZ71]

no, a factory NP203 does NOT have 2hi. the shift positions are as follow:

Hi Loc
Hi
N
Lo
Lo Loc

[GreaseDog]

no, a factory NP203 does NOT have 2hi. the shift positions are as follow:

Hi Loc
Hi
N
Lo
Lo Loc:word:

[~Super~Midget~]

actually you're backwards... if you're sitting in the seat looking at the shifter it would run from from High to Low, but ya get the hidea
Dash:
Low Loc
Low
N
High
High Loc
Seat:

[Jon4x4]

but yet i never got my 78 in eitherr lock's just lo n hi

[FordeatinZ71]

actually you're backwards... if you're sitting in the seat looking at the shifter it would run from from High to Low, but ya get the hidea
Dash:
Low Loc
Low
N
High
High Loc
Seat:

you REALLY, REALLY wanted to make a post, didn't ya?

[~Super~Midget~]

haha its not the first time i've made it.... but its something i had to figure out the hard way when i got the 77 in my sig i sold today since it didn't have the original knob on the shifter when i got it

[FordeatinZ71]

ah so you did sell it...sounded like a nice truck!

[~Super~Midget~]

yeah sold it to a guy i mud race with, tax time my next truck will show up on the forums haha, working the kinks out of the wifes new jeep over the winter though

[FordeatinZ71]

well that's cool bud, have fun with the Jeep!

[JJV]

i havent been up here in a while been working non stop but i di manage to work on my truck i put in new warn locking hubs i changed the oil in the transfer case and the buzzing noise went away and my front driveshaft was hitting agaist the crossmember so i finally got everything right on it 4wd works great now i really appreciate all of your guys help now i can start building a nice little small block so i can have a good excuse for getting bad gas mileage lol

[FordeatinZ71]

sweet bud, glad to hear it! now, post pics of that bad boy (or girl, lol) so we can all take a gander...

[JJV]

http://www.fullsizechevy.com/forum/garage.php?do=user_garage_view&id=139258

[JJV]

i tried to upload a picture but i believe i have failed lol i do have one pic of the truck on my profile im snap some more tomorrow

[FordeatinZ71]

well, i can't see what you uploaded (could be because i'm on a smart [dumb] phone) but from what i can tell in your avatar pic, good lookin truck!

[tahoe 9955]

just a note after reading thread some 76 and 77's came with full-time 4wd you had to buy an aftermarket kit that included lock unlock hubs and a crosbar peice that went in the 203 transfer case hubs where called part-time

[FordeatinZ71]

the full-time 4x4 was introduced with the 1973 restyling of the K-series trucks. when you ordered 4wd and an automatic transmission in a 1/2 ton truck you got it...

[tahoe 9955]

your right i was refering to K-5 blazer 76-77

[FordeatinZ71]

even on the K5's the full-time system came on in '73...just like the pickups.

[Your41Plague12]

All K-series half ton and 3/4 ton trucks with automatic transmissions from 73-80 got the NP203, while the manual half tons and 3/4 tons (along with ALL 1 tons) got NP205's. From 81-87, I'm pretty sure everything had an NP208 except the 1 tons.

[FordeatinZ71]

where are you getting this info from? all the literature i've read and my Chevy Pickups book say the 203 only came in 1/2 tons with the automatic...3/4 tons got the 205. i mean, i could be wrong and i'll gladly eat crow if i am...but i've never in my life seen a 3/4 ton truck with a 203 in it...

[GreaseDog]

All K-series half ton and 3/4 ton trucks with automatic transmissions from 73-80 got the NP203, while the manual half tons and 3/4 tons (along with ALL 1 tons) got NP205's. From 81-87, I'm pretty sure everything had an NP208 except the 1 tons.negative on the use of the 203... where would we get 400/205 combos from? and EVERYTHING in 1980 got a 205, the 203 was phased out after 79, and the 208 didn't come into play until 1981.

[GreaseDog]

where are you getting this info from? all the literature i've read and my Chevy Pickups book say the 203 only came in 1/2 tons with the automatic...3/4 tons got the 205. i mean, i could be wrong and i'll gladly eat crow if i am...but i've never in my life seen a 3/4 ton truck with a 203 in it...i have owned 3 77-79 K20s with automatics (2 TH350s, and one TH400) that say your book is wrong... wish i would have known what i had with the 400/203 combo.

[96K2500]

I have read that all '73 models had a 205 also. A couple friends had K20's, a 75 TH350/NP203 and a 76 TH400/NP203.

[Your41Plague12]

negative on the use of the 203... where would we get 400/205 combos from? and EVERYTHING in 1980 got a 205, the 203 was phased out after 79, and the 208 didn't come into play until 1981.
I thought the TH400/NP205 combo only came from K30's. I thought all 4x4 1 tons from '77 to 87 got the NP205, regardless of whether automatic or manual. Thanks for the info about '80 only having NP205's, I learned something new.

[GreaseDog]

I thought the TH400/NP205 combo only came from K30's. I thought all 4x4 1 tons from '77 to 87 got the NP205, regardless of whether automatic or manual. Thanks for the info about '80 only having NP205's, I learned something new.as for the 400/205, i've seen plenty of them in K20s. surely there aren't that many transplants out there.

you are correct on the 1 tons all getting 205s, except one thing... military trucks (though no different anywhere else other than the 24v system) most of the time got a 208. i think it was the M1031s that got 205s.

[FordeatinZ71]

i have owned 3 77-79 K20s with automatics (2 TH350s, and one TH400) that say your book is wrong... wish i would have known what i had with the 400/203 combo.

well, like i said...if i'm wrong i'm wrong. thanks for the insight on this bud. i just have never seen a full-time 4wd K20...i'm not saying that such a beast didn't exist. i can honestly say i wouldn't want one. i'm not a fan of the 203...i've owned one...and while it was trouble free i just didn't like it. i'd rather have the 205...

[GreaseDog]

well, like i said...if i'm wrong i'm wrong. thanks for the insight on this bud. i just have never seen a full-time 4wd K20...i'm not saying that such a beast didn't exist. i can honestly say i wouldn't want one. i'm not a fan of the 203...i've owned one...and while it was trouble free i just didn't like it. i'd rather have the 205...its ok, i don't like my 203 either, or the TH350 that's in front of it... i'm probably going to end up putting a 700/208 combo in that truck when it comes back out (strictly a driver and extremely light hauler)

[FordeatinZ71]

that's exactly what i'd put in it. another good combo (if there's such an adapter) would be the 4L80E/205...

[GreaseDog]

that's exactly what i'd put in it. another good combo (if there's such an adapter) would be the 4L80E/205...working on that one too... going to go in my 80 chassis with the 93's body on top... unless i can figure out the 80E/241 beforehand.

[FordeatinZ71]

lol i like the way you think...:-)

[GreaseDog]

just workin with the "junk" i have... fresh SYE'd short shaft 241 vs fresh rebuilt 205...

[FordeatinZ71]

lol that doesn't sound anything like junk to me. and yea, that'd be a difficult decision...the 241 is a tough case and the SYE makes it that much sweeter...hmmmm...:lol: