Nv4500 cracked case - Competition Diesel.Com

diesel_importer · 12-26-2016, 07:48 PM

In the last few years, I've had 1 customer with a cracked case and it was due to not seating the U-joint clips. Now, in the last week I've had 2 customers return with cracked cases. Both, have had a rebuilt nb4500 installed by me. I'm starting to question myself......... One is a first gen that ended up having driveline vibration, should have never let it leave. Customer said it had been like that, I suggested taking it to a driveline shop to get it fixed. My fault, so now it's being fixed right.
2nd truck I haven't got in the shop, yet. Customer says they found a crack toward the top (guessing it's the same place as usual) Just your typical 2nd gen 4wd. We had the NV rebuilt a month or so ago, and had the t-case gone thru. It drove perfect. No vibration, no leaks, etc.
Anybody have some input?

Sent from my iPhone using Tapatalk

Mark Nixon · 12-26-2016, 08:41 PM

Never seen this, personally.
What's the chances either dropped a rear driveshaft previously?

Mark.

not enoughsmoke · 12-27-2016, 12:00 AM

drivers side close to top on the top bell housing bolt

diesel_importer · 12-27-2016, 07:13 AM

The first gen definitely had a bent driveline. We just got it repaired. That truck prob hasn't driven 150 easy miles since the rebuild, and the case cracked that quick.

This second gen, I'll get checked out today and see what's up.

jlbayes · 12-27-2016, 10:29 AM

I had a buddy crack 2 or 3 getrags and then 2 nv4500s trying to be a drag racer with his 1st gen. I bet he also had some mount issues letting stuff move further than it should.

99GreenCummins · 12-27-2016, 11:53 AM

We have one laying in the building I plan to have welded, rebuild and install in brother's puller. It had a broken input. Front bearing has been extremely hot. My guess on this one is front bearing locked up, broke input and cracked housing.

I also now own the truck that the trans came out of. It does have quite a bit of movement and has been beat on.

M249cummins · 01-28-2017, 11:47 AM

Maybe they were already there? once I cleaned and light grit air sanded the whole outer case I found probably 5 separate cracks. my case has been through a lot and will be retired the next time it comes out.

Me personally and some people I know have had and still have issues with the rubber mount under the transfer case coming loose or wallering the mount holes and you can move it quite a bit.

A new case is like $300, might as well imo.

turbo_coffin · 03-04-2017, 08:22 PM

Bad Trans mount and good motor mount leads to the driver side bell housing upper bolt area to Crack.

12-26-2016, 07:48 PM	#1
diesel_importer Name: diesel_importer Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Fairfield,TX Member`s Gallery Posts: 4,501	Nv4500 cracked case In the last few years, I've had 1 customer with a cracked case and it was due to not seating the U-joint clips. Now, in the last week I've had 2 customers return with cracked cases. Both, have had a rebuilt nb4500 installed by me. I'm starting to question myself......... One is a first gen that ended up having driveline vibration, should have never let it leave. Customer said it had been like that, I suggested taking it to a driveline shop to get it fixed. My fault, so now it's being fixed right. 2nd truck I haven't got in the shop, yet. Customer says they found a crack toward the top (guessing it's the same place as usual) Just your typical 2nd gen 4wd. We had the NV rebuilt a month or so ago, and had the t-case gone thru. It drove perfect. No vibration, no leaks, etc. Anybody have some input? Sent from my iPhone using Tapatalk __________________ 01 QCSB 2WD AUTO: Redline/Smarty, Monster VP, 6x.013, S467 FMW, Goerend Trans, Caltracs. Fuel only - 11.85 @ 114, 50 Shot - 11.58 @ 116 w/ 1.69 60'

12-26-2016, 08:41 PM	#2
Mark Nixon Name: Mark Nixon Title: No Savior among the flesh Status: Not Here Join Date: Feb 2009 Location: Brownville, Nebraska Member`s Gallery Posts: 8,676	Never seen this, personally. What's the chances either dropped a rear driveshaft previously? Mark. __________________ If you or I did business like the PEOPLE in government do business, we'd be put in jail. Government is coercive. Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.

12-27-2016, 12:00 AM	#3
not enoughsmoke Name: not enoughsmoke Title: floatin in tha gulf Status: Not Here Join Date: Dec 2008 Location: tenn Member`s Gallery Posts: 5,730	drivers side close to top on the top bell housing bolt __________________ 1995 F350 Powerstroke 1995 F350 Fummins 1995 F250 lightning clone 1968 Fastback GT 2003 F150 1994 F350 IDIT 1988 F350 IDIT 2003 Dodge 2500 1999 F250 Powerstroke 1993 F250 Fummins 1979 F350

12-27-2016, 07:13 AM	#4
diesel_importer Name: diesel_importer Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Fairfield,TX Member`s Gallery Posts: 4,501	The first gen definitely had a bent driveline. We just got it repaired. That truck prob hasn't driven 150 easy miles since the rebuild, and the case cracked that quick. This second gen, I'll get checked out today and see what's up. __________________ 01 QCSB 2WD AUTO: Redline/Smarty, Monster VP, 6x.013, S467 FMW, Goerend Trans, Caltracs. Fuel only - 11.85 @ 114, 50 Shot - 11.58 @ 116 w/ 1.69 60'

12-27-2016, 10:29 AM	#5
jlbayes Name: jlbayes Title: Too Much Time Status: Not Here Join Date: Mar 2011 Location: michigan Member`s Gallery Posts: 2,399	I had a buddy crack 2 or 3 getrags and then 2 nv4500s trying to be a drag racer with his 1st gen. I bet he also had some mount issues letting stuff move further than it should. __________________ Jacob, 97 rclb

12-27-2016, 11:53 AM	#6
99GreenCummins Name: 99GreenCummins Title: That guy.... Status: Not Here Join Date: Feb 2011 Location: Marietta, Ohio Member`s Gallery Posts: 2,387	We have one laying in the building I plan to have welded, rebuild and install in brother's puller. It had a broken input. Front bearing has been extremely hot. My guess on this one is front bearing locked up, broke input and cracked housing. I also now own the truck that the trans came out of. It does have quite a bit of movement and has been beat on. __________________ Todd Some farm trucks 2014 Ram 3500 19.5s, aisin 1999 Ram 2500,6 spd, typical mods

01-28-2017, 11:47 AM	#7
M249cummins Name: M249cummins Title: Diesel Enthusiast Status: Not Here Join Date: Jan 2017 Member`s Gallery Posts: 157	Maybe they were already there? once I cleaned and light grit air sanded the whole outer case I found probably 5 separate cracks. my case has been through a lot and will be retired the next time it comes out. Me personally and some people I know have had and still have issues with the rubber mount under the transfer case coming loose or wallering the mount holes and you can move it quite a bit. A new case is like $300, might as well imo.

03-04-2017, 08:22 PM	#8
turbo_coffin Name: turbo_coffin Title: Rookie Status: Not Here Join Date: Sep 2015 Location: saskatchewan Member`s Gallery Posts: 22	Bad Trans mount and good motor mount leads to the driver side bell housing upper bolt area to Crack.