How Loud Is Your Transfer Case In 4HI? - Page 3

**KensAuto** · 12-01-2012, 06:13 AM

are you saying you haven't checked the fluid yet?

Hotdogstand · 12-01-2012, 06:34 AM

Mine makes a fair bit of noise, kind of a whirring maybe would describe it. I've read up on the pump rub issue, so I checked my fluid level to be sure, bit I'm up to the fill plug, so...?

I haven't torn one apart, but if there are straight cut gears, those are louder than sprockets or helical cut gears. That might have something to do withi it.

48548 · 12-01-2012, 07:40 AM

Quote:

Originally Posted by Hotdogstand

Mine makes a fair bit of noise, kind of a whirring maybe would describe it. I've read up on the pump rub issue, so I checked my fluid level to be sure, bit I'm up to the fill plug, so...?

I haven't torn one apart, but if there are straight cut gears, those are louder than sprockets or helical cut gears. That might have something to do withi it.

The transfer case has chains in it. So maybe it is the chain making noise?

Armus · 12-01-2012, 09:15 AM

Quote:

Originally Posted by KensAuto

are you saying you haven't checked the fluid yet?

No, I took it to the dealer when I first noticed the noise, but it is correct to say the first thing to do should be to check the level.

**Tubbs** · 12-01-2012, 10:00 AM

Quote:

Originally Posted by Armus

Hello brothers.

With the onset of winter I've had the occasion to use four wheel drive the past few weeks. Although one cannot expect a transfer case meant to handle serious torque to be whisper quiet, mine seems to whine a fair amount, especially on coast down. My exhaust is still factory stock (i.e. quiet) which makes any case noises that much easier to hear, but still I find myself wondering if my noise is normal for an HD part, or if something is wrong.

At highway cruise, light throttle, the volume of the transfer case whine on coast down is about 75% as loud as the engine itself. How loud is yours? Is your exhaust stock like mine?

Had mine checked when first purchased, it has a growl during acceleration
and deceleration, dealer stated the 2011 have that growl sound. Had them write it up and test drive just so there is a record of it.

Tubbs

Armus · 12-01-2012, 01:08 PM

Well I had the occasion to drive another new truck, and it makes the exact same sound in 4HI as mine, so there is nothing wrong.

I guess if one comes from the half ton world, where everything is car like and no need to accommodate 800 ft-lbs, transfer cases can be made relatively silent. Not so in the HD world.

.

crossfire879 · 12-01-2012, 08:38 PM

I don't normally drive in 4wd but I just recently went on a snowmobile trip and the highways were terrible so I put in 4hi and left it in there for 2000+ kms. Driving at 100-140km/h and never noticed any noise. I have a 5" straight pipe so maybe I can't hear it but I can't feel anything either. I also changed my oil to transynd. Filled it through the full hole until it came running out.

GMC04LLY · 12-01-2012, 09:33 PM

Hey I read this in 8 Lug, GM Transfer Case Pump Rub Repair - WTR - 8-Lug Magazine
Talks about the hole that will affect all of us sometime if its is not addressed.

48548 · 12-02-2012, 03:25 PM

Our cases (NNBS) have been redesigned and shouldn't need that. I think all nnbs 07 or so and up should be covered with the new case. Here is the new and old.

Armus · 12-02-2012, 04:10 PM

Which year did this change take effect? Does "NNBS 07" imply 2007 and newer?

12-01-2012, 06:13 AM	eBay Motors #21 (permalink)
KensAuto Duramax Lifetime Supporter Join Date: Apr 2012 Location: Casa Grande, Az Posts: 2,217	are you saying you haven't checked the fluid yet? __________________ 2012 GMC 2500 SLT 4x4 H&S minimaxx, MBRP downpipe back SS duals, Insight CTS w/backup cam, Fass HD150, PPE rear diff cover, Amsoil front to rear w/by-pass Cognito 4-6 NTBD w/idler/pitman braces, a-arms, Monster energy 18x9 w/BFG KM2s 35x12.5, Recon smoked cab lights Titan 57 gal saddle tank, linex color matched bedliner w/kevlar, Trekstep bed steps x2, RBP rail steps

12-01-2012, 06:34 AM	eBay Motors #22 (permalink)
Hotdogstand Senior Member Join Date: Feb 2011 Location: Virginia Beach Posts: 410	Mine makes a fair bit of noise, kind of a whirring maybe would describe it. I've read up on the pump rub issue, so I checked my fluid level to be sure, bit I'm up to the fill plug, so...? I haven't torn one apart, but if there are straight cut gears, those are louder than sprockets or helical cut gears. That might have something to do withi it. __________________ 2003 Chevy 2500HD D/A ECSB 206K EFI Live, batmowheel & BD wastegate (thanks to MrManners @ Synthetic Motorsports) AD 150, Kryptonite tie-rods, MBRP downpipe and 4" straight pipe, 33" BF Goodrich A/T KOs on H2s Goals: Morgan's Corner next season! Transmission (see goal #1) Last edited by Hotdogstand; 12-01-2012 at 06:37 AM.

12-01-2012, 01:08 PM	eBay Motors #26 (permalink)
Armus Junior Member Join Date: Jun 2012 Location: Tar Sands Posts: 151	Well I had the occasion to drive another new truck, and it makes the exact same sound in 4HI as mine, so there is nothing wrong. I guess if one comes from the half ton world, where everything is car like and no need to accommodate 800 ft-lbs, transfer cases can be made relatively silent. Not so in the HD world. . __________________ Attention environmentalists, reduce emissions from this:

12-01-2012, 08:38 PM	eBay Motors #27 (permalink)
crossfire879 Senior Member Join Date: Jun 2010 Location: Fort McMurray Alberta Canada Posts: 756	I don't normally drive in 4wd but I just recently went on a snowmobile trip and the highways were terrible so I put in 4hi and left it in there for 2000+ kms. Driving at 100-140km/h and never noticed any noise. I have a 5" straight pipe so maybe I can't hear it but I can't feel anything either. I also changed my oil to transynd. Filled it through the full hole until it came running out. __________________ 2012 GMC 2500HD cc/sb Ultimate GFX Edition Escort 9500ix radar detector, Rancho stabilizer, Rotella T6 synthetic 5w40 engine oil, Allison Transynd transmission oil, H&S mini maxx, FASS Titanium 150, 5" flo pro straight exhaust, Diamond Eye Downpipe, Autometer Cobalt Pyro and Boost Gauges, AFE Stage 2 CAI, ASDP EGR Block Plate. Running on HOT

12-01-2012, 09:33 PM	eBay Motors #28 (permalink)
GMC04LLY DuramaxForum n00b Join Date: Nov 2012 Posts: 14	Hey I read this in 8 Lug, GM Transfer Case Pump Rub Repair - WTR - 8-Lug Magazine Talks about the hole that will affect all of us sometime if its is not addressed. __________________ LLY, MBRP 5'' TB, AFE intake & bladerunner, ppe fule rail & hot 2+2 programer, and a few other goodies.

12-02-2012, 03:25 PM	eBay Motors #29 (permalink)
48548 Senior Member Join Date: May 2012 Location: Phoenix, AZ Posts: 475	Our cases (NNBS) have been redesigned and shouldn't need that. I think all nnbs 07 or so and up should be covered with the new case. Here is the new and old. __________________ 2012- Denali HD 4x4 2500 Xpel clear bra, amp steps, Inyati Bedliner. Rancho RS5000 Steering Stabilizer-Rancho 9000XL Shocks PPE PTO-front/rear/Allison covers with transynd and amsoil severe gear oil. Last edited by 48548; 12-02-2012 at 03:57 PM.

12-02-2012, 04:10 PM	eBay Motors #30 (permalink)
Armus Junior Member Join Date: Jun 2012 Location: Tar Sands Posts: 151	Which year did this change take effect? Does "NNBS 07" imply 2007 and newer? __________________ Attention environmentalists, reduce emissions from this:

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