05 Z71 transfer case clunk - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bmchevy1979 · 02-04-2016, 09:20 PM

Well I recently purchased a 05 Chevy Silverado 4x4 and i am getting ready to service the transfer case and axles on it but on the transfer case when you are shifting from high 4wd to low 4wd it makes a clunk that is fairly loud it doesn't do it any other time just when shifting from high to Low and Low to High. 4wd functions perfectly in both its just fairly loud when switching I'd like to know if it's something I should be concerned about or not the truck is pretty much stock and I plan on using it off road quite often mostly at the sand dunes and in the snow it looks to be the original fluid in the transfer case it's fairly dark compaired to the bright blue that the Autotrak ll fluid is so is it possibly that it's just gummed up from not being used very often and the fluid being old

**WestButteTruck** · 02-06-2016, 10:08 PM

I figure it's normal, every push button 4x4 I've owned (5) have done this going into 4 low. And typically I am on level ground, stopped, in neutral.

68C15 · 02-10-2016, 06:25 PM

I'm still trying to figure out why they put 4 low in a passenger truck.

WigglesTheHoly · 02-16-2016, 05:39 PM

68C15
Because sometimes we like to pull bushes out of the front yard....atleast that is the last time I used mine. lol

allengator · 02-26-2016, 11:43 AM

my '04 Tahoe has done that since new.... so did the '02 before it....

kaycee · 03-26-2016, 10:29 AM

transfer case pump rub it will eventually crack your rear case and cause a leak or replace the back half case. A cheap easy fix for this is to get a pump rub plate to prevent this $30 its not hard at all to put in ther is another kit to use but it is $75 and a little more advanced installation. There are several videos on you tube on this procedure . If you plan on keeping the truck or 4x a lot this is a must do

WigglesTheHoly · 03-28-2016, 11:03 AM

Here is a good video on it. https://www.youtube.com/watch?v=bOyZ...nPCz4Y&index=2

treveiger · 04-05-2016, 02:56 AM

I thought the pump rub was a issue for the hds only? Does it effect all transfer cases? I'd say the clunk is normal, try it on gravel with the truck in neutral to see if it reduces the noise.

clinebarger · 04-05-2016, 08:25 PM

Quote:

Originally Posted by treveiger

I thought the pump rub was a issue for the hds only? Does it effect all transfer cases? I'd say the clunk is normal, try it on gravel with the truck in neutral to see if it reduces the noise.

It affects all GMT800 trucks. For example a 1500 would have NP261-LD & a 2500 would have a NP261-HD....The only difference between the 2 is the Input Gear (27 spline vs 32 spline).

treveiger · 04-06-2016, 01:56 AM

That's good to know, thank you.

kaycee · 04-07-2016, 10:23 PM

My 01 1500 had it and it has the NP 246 x-CASE

richards72chevy · 05-21-2016, 10:06 PM

I have an 02 Silverado 1500 push button 4wd would it use the autotrak ll?How many quarts?Should it be changed after the truck has been driven a little bit or can it be changed cold?

clinebarger · 05-23-2016, 09:48 PM

The Auto NP246 is also effected by Pump Rub.

NP246 uses 2 Quarts of Auto Trak II Fluid.

NP261 & NP263 take 2 Quarts of Dexron III ATF.

AnotherWs6 · 05-23-2016, 09:50 PM

My 2000 with 308K miles has always done that.

02-04-2016, 09:20 PM	#1
bmchevy1979 Registered User Join Date: Dec 2010 Location: Visalia, Ca Posts: 707	05 Z71 transfer case clunk Well I recently purchased a 05 Chevy Silverado 4x4 and i am getting ready to service the transfer case and axles on it but on the transfer case when you are shifting from high 4wd to low 4wd it makes a clunk that is fairly loud it doesn't do it any other time just when shifting from high to Low and Low to High. 4wd functions perfectly in both its just fairly loud when switching I'd like to know if it's something I should be concerned about or not the truck is pretty much stock and I plan on using it off road quite often mostly at the sand dunes and in the snow it looks to be the original fluid in the transfer case it's fairly dark compaired to the bright blue that the Autotrak ll fluid is so is it possibly that it's just gummed up from not being used very often and the fluid being old __________________ <Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works. 1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195

02-06-2016, 10:08 PM	#2
WestButteTruck Kung Fu Master Join Date: Oct 2005 Location: Montana Posts: 543	Re: 05 Z71 transfer case clunk I figure it's normal, every push button 4x4 I've owned (5) have done this going into 4 low. And typically I am on level ground, stopped, in neutral. __________________ 72 GMC SuperCustom 4x4 1972 Chevrolet Cheyenne Super 4x4

02-10-2016, 06:25 PM	#3
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 05 Z71 transfer case clunk I'm still trying to figure out why they put 4 low in a passenger truck. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

02-16-2016, 05:39 PM	#4
WigglesTheHoly IT Guy/ Father/ Chevy lover Join Date: Feb 2010 Location: Hoisington, KS Posts: 568	Re: 05 Z71 transfer case clunk 68C15 Because sometimes we like to pull bushes out of the front yard....atleast that is the last time I used mine. lol __________________ 78 Chevy (Pictures) SOLD 79 Chevy LWB (pasture) 83 Chevy LWB (crushed rusted beyond repair) 02 TrailBlazer SOLD 03 VW Passat wagonSOLD 95 extended cab silveradoSOLD (still in family) 05 Crew Cab Silverado 5.3 (The Turd) WTB: 66 El camino Technology Specialist aspiring to be a gear head.

02-26-2016, 11:43 AM	#5
allengator Registered User Join Date: Dec 2010 Location: Burleson, Texas Posts: 596	Re: 05 Z71 transfer case clunk my '04 Tahoe has done that since new.... so did the '02 before it.... __________________ Allengator Outta the Blue (my band - available for hire in the DFW area!) 1980 Chevy SWB Pickup (build thread) 1951 Chevy Sedan Delivery 2004 Chevy Tahoe Z71 2011 Harley Davidson Street Glide 2018 Silverado Z71 Crew Cab

03-26-2016, 10:29 AM	#6
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,443	Re: 05 Z71 transfer case clunk transfer case pump rub it will eventually crack your rear case and cause a leak or replace the back half case. A cheap easy fix for this is to get a pump rub plate to prevent this $30 its not hard at all to put in ther is another kit to use but it is $75 and a little more advanced installation. There are several videos on you tube on this procedure . If you plan on keeping the truck or 4x a lot this is a must do __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

03-28-2016, 11:03 AM	#7
WigglesTheHoly IT Guy/ Father/ Chevy lover Join Date: Feb 2010 Location: Hoisington, KS Posts: 568	Re: 05 Z71 transfer case clunk Here is a good video on it. https://www.youtube.com/watch?v=bOyZ...nPCz4Y&index=2 __________________ 78 Chevy (Pictures) SOLD 79 Chevy LWB (pasture) 83 Chevy LWB (crushed rusted beyond repair) 02 TrailBlazer SOLD 03 VW Passat wagonSOLD 95 extended cab silveradoSOLD (still in family) 05 Crew Cab Silverado 5.3 (The Turd) WTB: 66 El camino Technology Specialist aspiring to be a gear head.

04-05-2016, 02:56 AM	#8
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,090	Re: 05 Z71 transfer case clunk I thought the pump rub was a issue for the hds only? Does it effect all transfer cases? I'd say the clunk is normal, try it on gravel with the truck in neutral to see if it reduces the noise. __________________ 1969 Chevy c20(Miss Hackjob)

04-06-2016, 01:56 AM	#10
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,090	Re: 05 Z71 transfer case clunk That's good to know, thank you. __________________ 1969 Chevy c20(Miss Hackjob)

04-07-2016, 10:23 PM	#11
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,443	Re: 05 Z71 transfer case clunk My 01 1500 had it and it has the NP 246 x-CASE __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

05-21-2016, 10:06 PM	#12
richards72chevy Registered User Join Date: Dec 2010 Location: konawa ok/oakdale Ca. Posts: 1,647	Re: 05 Z71 transfer case clunk I have an 02 Silverado 1500 push button 4wd would it use the autotrak ll?How many quarts?Should it be changed after the truck has been driven a little bit or can it be changed cold?

05-23-2016, 09:48 PM	#13
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 05 Z71 transfer case clunk The Auto NP246 is also effected by Pump Rub. NP246 uses 2 Quarts of Auto Trak II Fluid. NP261 & NP263 take 2 Quarts of Dexron III ATF.

05-23-2016, 09:50 PM	#14
AnotherWs6 Registered User Join Date: Feb 2016 Location: Westchester, NY Posts: 602	Re: 05 Z71 transfer case clunk My 2000 with 308K miles has always done that. __________________ 1968 C-10 Suburban - Original 396/TH400 2002 Transam WS6 - M6 - Black/Black - Evil Garage Queen 2000 Silverado - DD - Small lift+Body lift+35" Duratracs+4.88's + Eaton TruTrac - Monster Truck 2010 Cadillac CTS Wagon Sport - Wife's DD and the only classy car we have.



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