72 Jimmy 4x4 transfer case troubles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VanceH · 01-21-2010, 12:35 PM

Ok heres the deal, i have a 72 jimmy with a automatic. I am assuming its a turbo 350. I just lost the transfer case and had to be towed home. I am wanting to replace or fix asap as this is my daily driver. Does anyone have any ideas what transfer case this is? How hard is this to rebuild

Thanks
Vance

JimmyFloyd · 01-21-2010, 12:37 PM

my guess would be it's a NP205, but don't quote me.

mrein3 · 01-21-2010, 01:52 PM

Make sure you get one that was originally behind a th350. The straight stick 205s have a different input shaft.

**D.PASSMORE** · 01-21-2010, 02:24 PM

Is it the T-case (NP-205) or the transmission (TB350)? Have you been able to determine which it could be causing the problem? Snaps some pictures, so it can be ID'd the units... There is plenty of rebuild info and kits available.

**Thealien** · 01-21-2010, 02:53 PM

Why do you think it is the transfer case? Those NP205s are pretty tuff!

VanceH · 01-21-2010, 08:39 PM

ok after getting underneath the rig its the u joint on the Transfercase side. (i think) But it does not look like any u joint i have ever seen. seems different. is there a special u joint on these? Sorry this is my first 4x4 i have owned in this year.

Thanks

*sharpie1972* · 01-21-2010, 08:43 PM

Please keep us posted on parts needs. Pictures would be helpful. If you haven't damaged a yoke or driveshaft this should be an easy fix. Sharpie

VanceH · 01-21-2010, 08:52 PM

I will post up pics in the morning, as its to dark now. I am trying to find the u-joint or a pic of it but i have seen nothing like this before. Its almost like a sleeve of some sort?

*sharpie1972* · 01-21-2010, 09:01 PM

Sounds like the "slip joint" might have let loose. This probably calls for a driveline rebuild or replacement. Still not nearly as bad as losing your trans. or transfercase. Any sign of damage to the transfercase yoke or housing? Sharpie

VanceH · 01-21-2010, 09:20 PM

ok i found a pic, this is not mine but this is what i have. Am i correct that there is 2 u-joints on the transfer side

VanceH · 01-21-2010, 09:12 PM

No damage on the transfercase at all, i looked thru some documents that i have when i bought the jimmy. it shows a rebuild on the transfercase with less than 10k ago. So i will take the driveshaft off in the morning and see what is what

*sharpie1972* · 01-21-2010, 09:16 PM

Let me know how bad the damage is. I have two original shafts and may be able to get you back on the road. A rebuild of your original is the best option if it's not too mangled. Sharpie

*sharpie1972* · 01-21-2010, 09:55 PM

Oh Boy! that is modified to the max. You have a driveshaft park brake set-up. Not factory, but very functional. I say you have 2 choices: Rebuild what you have or go back to stock. The problem with stock would be the cost/trouble of replacing a factory park brake set-up. You may be money ahead to fix what you have if it is not totally destroyed. Sharpie

VanceH · 01-21-2010, 10:07 PM

like i said this is not mine just a pic of what my ujoint set up is. I dont think i have the same brake setup. is the h joint factory on these?

BLAZERMAN · 01-21-2010, 10:10 PM

Thats a CV joint [constant velocity] and would be normal for the transfer case side of your front driveshaft but not the rear.

FLEET72 · 01-21-2010, 10:24 PM

That is a "double cardan joint"

a little tougher to repair but very doable in the driveway or at the rest stop 20 miles east of Phoenix on I-10 in the middle of summer.

**D.PASSMORE** · 01-21-2010, 10:09 PM

What are the symptoms of the problem with the drive line?

*72lb4x4* · 01-21-2010, 10:14 PM

If the TC is in 2H and you have unlocked locking hubs, why is the front driveshaft an issue?

VanceH · 01-21-2010, 10:23 PM

not sure how the whole 4x4 thing works, i think i have a hub stuck in the locked positon or somthing. The front drive shaft turns when the truck moves. It happened while i was driving 60 on the highway. all of a sudden BANG BANG BANG so i stopped and had it towed. The shaft looks good but there is about an inch play in the CV or H-joint. I will pull it off in the morning and take a bunch of pics. Does anyone know if this takes a standard Ujoint?

FLEET72 · 01-21-2010, 10:26 PM

Quote:

Originally Posted by VanceH

not sure how the whole 4x4 thing works, i think i have a hub stuck in the locked positon or somthing. The front drive shaft turns when the truck moves. It happened while i was driving 60 on the highway. all of a sudden BANG BANG BANG so i stopped and had it towed. The shaft looks good but there is about an inch play in the CV or H-joint. I will pull it off in the morning and take a bunch of pics. Does anyone know if this takes a standard Ujoint?

Check this

msgross · 01-21-2010, 10:27 PM

you should be able to go into NAPA and get new u-joints for that. Find a buddy with a vice and it can be done in a few hours. Or take it off and have a mechanic fix it...

Is the Transfer Case in 2WD? If so the front driveshaft shouldn't be turning...

VanceH · 01-21-2010, 10:51 PM

Hey fleet thats it!!!! thanks again for all the help ill post up pics in the morning

FLEET72 · 01-21-2010, 11:00 PM

Also, if it is the front drive shaft just take it off and you can still drive it as needed til the shaft is repaired . If it is the rear shaft you can still drive the truck, just pull the rear shaft, put the transfer case in 4H, lock the hubs and off you go. I drove my K5 that way for a week while having a new rear shaft made up.

**D.PASSMORE** · 01-22-2010, 07:30 AM

When you get it apart, pull the yoke out of the rear of the T-case and look at the splines for damage, Also, replace the two seals in the housing. The are notourious leakers. I have part numbers if needed.
Keep use informed, I'm in the process of rebuilding a 72 Blazer driveline.

*sharpie1972* · 01-22-2010, 09:11 AM

You may want to clarify if it's a front shaft or the rear shaft that you are having trouble with. I can't quite tell which one from the conversation so far. Sharpie

01-21-2010, 12:35 PM	#1
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	72 Jimmy 4x4 transfer case troubles Ok heres the deal, i have a 72 jimmy with a automatic. I am assuming its a turbo 350. I just lost the transfer case and had to be towed home. I am wanting to replace or fix asap as this is my daily driver. Does anyone have any ideas what transfer case this is? How hard is this to rebuild Thanks Vance

01-21-2010, 12:37 PM	#2
JimmyFloyd Registered User Join Date: Apr 2009 Location: Rochester, NY Posts: 1,458	Re: 72 Jimmy 4x4 transfer case troubles my guess would be it's a NP205, but don't quote me. __________________ 1970 Blazer 350/SM465/205 SOLD! \| 1998 Z3

01-21-2010, 01:52 PM	#3
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	Re: 72 Jimmy 4x4 transfer case troubles Make sure you get one that was originally behind a th350. The straight stick 205s have a different input shaft. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

01-21-2010, 02:24 PM	#4
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,059	Re: 72 Jimmy 4x4 transfer case troubles Is it the T-case (NP-205) or the transmission (TB350)? Have you been able to determine which it could be causing the problem? Snaps some pictures, so it can be ID'd the units... There is plenty of rebuild info and kits available. __________________ DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie) Last edited by D.PASSMORE; 01-21-2010 at 02:25 PM.

01-21-2010, 02:53 PM	#5
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,135	Re: 72 Jimmy 4x4 transfer case troubles Why do you think it is the transfer case? Those NP205s are pretty tuff! __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

01-21-2010, 08:39 PM	#6
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles ok after getting underneath the rig its the u joint on the Transfercase side. (i think) But it does not look like any u joint i have ever seen. seems different. is there a special u joint on these? Sorry this is my first 4x4 i have owned in this year. Thanks

01-21-2010, 08:43 PM	#7
sharpie1972 Account Suspended Join Date: Apr 2007 Location: Powell, Wyoming Posts: 4,973	Re: 72 Jimmy 4x4 transfer case troubles Please keep us posted on parts needs. Pictures would be helpful. If you haven't damaged a yoke or driveshaft this should be an easy fix. Sharpie

01-21-2010, 08:52 PM	#8
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles I will post up pics in the morning, as its to dark now. I am trying to find the u-joint or a pic of it but i have seen nothing like this before. Its almost like a sleeve of some sort?

01-21-2010, 09:01 PM	#9
sharpie1972 Account Suspended Join Date: Apr 2007 Location: Powell, Wyoming Posts: 4,973	Re: 72 Jimmy 4x4 transfer case troubles Sounds like the "slip joint" might have let loose. This probably calls for a driveline rebuild or replacement. Still not nearly as bad as losing your trans. or transfercase. Any sign of damage to the transfercase yoke or housing? Sharpie

01-21-2010, 09:20 PM	#10
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles ok i found a pic, this is not mine but this is what i have. Am i correct that there is 2 u-joints on the transfer side Attached Images

01-21-2010, 09:12 PM	#11
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles No damage on the transfercase at all, i looked thru some documents that i have when i bought the jimmy. it shows a rebuild on the transfercase with less than 10k ago. So i will take the driveshaft off in the morning and see what is what

01-21-2010, 09:16 PM	#12
sharpie1972 Account Suspended Join Date: Apr 2007 Location: Powell, Wyoming Posts: 4,973	Re: 72 Jimmy 4x4 transfer case troubles Let me know how bad the damage is. I have two original shafts and may be able to get you back on the road. A rebuild of your original is the best option if it's not too mangled. Sharpie

01-21-2010, 09:55 PM	#13
sharpie1972 Account Suspended Join Date: Apr 2007 Location: Powell, Wyoming Posts: 4,973	Re: 72 Jimmy 4x4 transfer case troubles Oh Boy! that is modified to the max. You have a driveshaft park brake set-up. Not factory, but very functional. I say you have 2 choices: Rebuild what you have or go back to stock. The problem with stock would be the cost/trouble of replacing a factory park brake set-up. You may be money ahead to fix what you have if it is not totally destroyed. Sharpie

01-21-2010, 10:07 PM	#14
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles like i said this is not mine just a pic of what my ujoint set up is. I dont think i have the same brake setup. is the h joint factory on these?

01-21-2010, 10:10 PM	#15
BLAZERMAN Currently Blazerless Join Date: Apr 2000 Location: St. Joseph Mo. Posts: 4,828	Re: 72 Jimmy 4x4 transfer case troubles Thats a CV joint [constant velocity] and would be normal for the transfer case side of your front driveshaft but not the rear. __________________ 1972 C/30 133" W.B. C&C 1970 GMC 3500 157" W.B. single wheel C&C



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01-21-2010, 10:24 PM	#16
FLEET72 Registered User Join Date: Jan 2007 Location: Sonoma, CA Posts: 521	Re: 72 Jimmy 4x4 transfer case troubles That is a "double cardan joint" a little tougher to repair but very doable in the driveway or at the rest stop 20 miles east of Phoenix on I-10 in the middle of summer. __________________ Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper

01-21-2010, 10:09 PM	#17
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,059	Re: 72 Jimmy 4x4 transfer case troubles What are the symptoms of the problem with the drive line?

01-21-2010, 10:14 PM	#18
72lb4x4 Account Suspended Join Date: Jul 2006 Location: DFW Posts: 1,427	Re: 72 Jimmy 4x4 transfer case troubles If the TC is in 2H and you have unlocked locking hubs, why is the front driveshaft an issue?

01-21-2010, 10:23 PM	#19
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles not sure how the whole 4x4 thing works, i think i have a hub stuck in the locked positon or somthing. The front drive shaft turns when the truck moves. It happened while i was driving 60 on the highway. all of a sudden BANG BANG BANG so i stopped and had it towed. The shaft looks good but there is about an inch play in the CV or H-joint. I will pull it off in the morning and take a bunch of pics. Does anyone know if this takes a standard Ujoint?

01-21-2010, 10:27 PM	#21
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 72 Jimmy 4x4 transfer case troubles you should be able to go into NAPA and get new u-joints for that. Find a buddy with a vice and it can be done in a few hours. Or take it off and have a mechanic fix it... Is the Transfer Case in 2WD? If so the front driveshaft shouldn't be turning... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

01-21-2010, 10:51 PM	#22
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Re: 72 Jimmy 4x4 transfer case troubles Hey fleet thats it!!!! thanks again for all the help ill post up pics in the morning

01-21-2010, 11:00 PM	#23
FLEET72 Registered User Join Date: Jan 2007 Location: Sonoma, CA Posts: 521	Re: 72 Jimmy 4x4 transfer case troubles Also, if it is the front drive shaft just take it off and you can still drive it as needed til the shaft is repaired . If it is the rear shaft you can still drive the truck, just pull the rear shaft, put the transfer case in 4H, lock the hubs and off you go. I drove my K5 that way for a week while having a new rear shaft made up. __________________ Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper

01-22-2010, 07:30 AM	#24
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,059	Re: 72 Jimmy 4x4 transfer case troubles When you get it apart, pull the yoke out of the rear of the T-case and look at the splines for damage, Also, replace the two seals in the housing. The are notourious leakers. I have part numbers if needed. Keep use informed, I'm in the process of rebuilding a 72 Blazer driveline. __________________ DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie)

01-22-2010, 09:11 AM	#25
sharpie1972 Account Suspended Join Date: Apr 2007 Location: Powell, Wyoming Posts: 4,973	Re: 72 Jimmy 4x4 transfer case troubles You may want to clarify if it's a front shaft or the rear shaft that you are having trouble with. I can't quite tell which one from the conversation so far. Sharpie

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