Locking hub ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1980chevy4x4 · 10-06-2003, 09:00 PM

If I put my truck in 4hi do i still have to get out an lock the hubs? It says that they lock automaticly. And when i put it back into 2wd do they unlock?

nu2-72 · 10-06-2003, 09:54 PM

I take it you have auto hubs or did you have auto hubs and someone has changed them to lock-outs?
If you have hubs that say lock free on them, you will need to get out and lock them in. If they do not have a turning knob in the hub, they are considered a full time 4x4. Simply shift inside the truck. This locks the transfer case. Shifting back unlocks it.

**JIMs70GMC** · 10-07-2003, 05:07 AM

One other thing to get auto hubs to unlock you have to switch the tc into 2 HI and then back-up about 15' to get them to unlock.

1980chevy4x4 · 10-07-2003, 04:08 PM

i have the kind that u have to turn. So if i want 4wd i have to shif the TC then get out and lock the hubs?

P.S
How do i tell what TC i have?

Destructo · 10-07-2003, 05:31 PM

Yes, there are manual and auto hubs, Manual hubs you have to get out and lock yourself, auto do it automatically.

nu2-72 · 10-07-2003, 05:51 PM

I have always locked the hubs first and then shifted the TC. Then do reverse order to unlock.
I have driven with the hubs locked in and the TC in 2 HI before. This was not for highway driving but for areas that I felt that I might get stuck in and did not want to get out in the mud to turn the lockouts.
Go to Advance Adapters homepage and they have pics of the cases. Looking from the rear, mine has a small circular 3 bolt plate, it is a 205. If you are not the original owner, it could have anything but I think it will be a 203. Chain drive.

1980chevy4x4 · 10-07-2003, 09:04 PM

Thanks guys

Destructo · 10-07-2003, 10:31 PM

I have a set of manuals the guy gave me with the axles I bought from him, I think I may put my auto hubs on the new axles though just so I don't have to get out this winter to lock them in, i'm kinda lazy ya know, probably put the manuals in after winter is over and i'll want the little extra gas mileage.

**JIMs70GMC** · 10-08-2003, 08:58 AM

auto hubs will have no effect on gas mileage. Unless you don't allow them to un-lock(i.e. back-up with TC in 2 HI). Auto hubs have nothing to do with full-time 4WD, Trucks that had full-time 4WD (non convereted NP203), had drive flanges on the front axle.

10-06-2003, 09:00 PM	#1
1980chevy4x4 Got Mud? Join Date: Sep 2003 Posts: 361	Locking hub ? If I put my truck in 4hi do i still have to get out an lock the hubs? It says that they lock automaticly. And when i put it back into 2wd do they unlock? __________________ Dan Got mud?

10-06-2003, 09:54 PM	#2
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	I take it you have auto hubs or did you have auto hubs and someone has changed them to lock-outs? If you have hubs that say lock free on them, you will need to get out and lock them in. If they do not have a turning knob in the hub, they are considered a full time 4x4. Simply shift inside the truck. This locks the transfer case. Shifting back unlocks it. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

10-07-2003, 05:07 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	One other thing to get auto hubs to unlock you have to switch the tc into 2 HI and then back-up about 15' to get them to unlock. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

10-07-2003, 04:08 PM	#4
1980chevy4x4 Got Mud? Join Date: Sep 2003 Posts: 361	i have the kind that u have to turn. So if i want 4wd i have to shif the TC then get out and lock the hubs? P.S How do i tell what TC i have? __________________ Dan Got mud?

10-07-2003, 05:51 PM	#6
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	I have always locked the hubs first and then shifted the TC. Then do reverse order to unlock. I have driven with the hubs locked in and the TC in 2 HI before. This was not for highway driving but for areas that I felt that I might get stuck in and did not want to get out in the mud to turn the lockouts. Go to Advance Adapters homepage and they have pics of the cases. Looking from the rear, mine has a small circular 3 bolt plate, it is a 205. If you are not the original owner, it could have anything but I think it will be a 203. Chain drive. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

10-07-2003, 05:31 PM	#5
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	Yes, there are manual and auto hubs, Manual hubs you have to get out and lock yourself, auto do it automatically.

10-07-2003, 09:04 PM	#7
1980chevy4x4 Got Mud? Join Date: Sep 2003 Posts: 361	Thanks guys __________________ Dan Got mud?

10-07-2003, 10:31 PM	#8
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	I have a set of manuals the guy gave me with the axles I bought from him, I think I may put my auto hubs on the new axles though just so I don't have to get out this winter to lock them in, i'm kinda lazy ya know, probably put the manuals in after winter is over and i'll want the little extra gas mileage.

10-08-2003, 08:58 AM	#9
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	auto hubs will have no effect on gas mileage. Unless you don't allow them to un-lock(i.e. back-up with TC in 2 HI). Auto hubs have nothing to do with full-time 4WD, Trucks that had full-time 4WD (non convereted NP203), had drive flanges on the front axle. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



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