4x4 Problems - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Lowered13 · 01-09-2016, 10:37 AM

This is the front axle.

Chevy_mud_truck · 01-09-2016, 10:45 AM

The rear is a 12 bolt need better picture of the other 2 take one of the cover on the front axle

**hatzie** · 01-09-2016, 11:54 AM

Do you have the SPID (Service Parts Idenitification) tag in the glovebox or on the front LH inner fender?
The build sheets are usually in the seat springs if it hasn't been swapped. My 76 had a 1980 build sheet in the seat springs.

A 1977-80 K10 or K20 could have either an 8 1/2 inch 10bolt or Dana 44 in the front.
The 10 bolt will have an Oval cover. The Dana axle covers are an odd hexagon.
Dana Axle ID Through 1980

Front Axle ID From GM Quick Req
Name: 1973-1980AxleID.jpg
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The 77 & 78 front axle identification codes are on page 26 of the 73-78 parts book
Identification numbers (bill of material) from DANA.

That rear axle looks like a GM Truck 12 bolt. Not surprising on a 77 K10.
The rear axle codes are in the 73-78 parts book pages 27-37. You'll find your ID stamped into the RH axle tube.

**JIMs70GMC** · 01-09-2016, 10:14 PM

front looks like a dana44, I don't see the 10 bolts "ears". The transfer case looks like a NP205.

Lowered13 · 01-15-2016, 10:51 AM

I am pretty sure they are both dana axles and is a np205 transfer case, it would make sense if they were. I couldn't find the build sheets is there any other of finding out that information. Maybe through Chevy some how?

cadillac_al · 01-15-2016, 11:43 AM

Post #10 will point you in the right direction.

**hatzie** · 01-15-2016, 01:34 PM

Quote:

Originally Posted by Lowered13

I am pretty sure they are both dana axles and is a np205 transfer case, it would make sense if they were. I couldn't find the build sheets is there any other of finding out that information. Maybe through Chevy some how?

Can't see enough of the Transfer case to tell. The round cover on a Cast Iron case looks close enough to the same on both the NP203 & NP205 transfer cases to not be a good tell. The giveaway would be that the NP203 has a range box between the transfer case and the transmission.

The front axle is a likely a Dana 44. See the Front Axle Ident guide in post #28. There are zero good pictures of it.

If it's not a 1967-1972 or earlier model (Dana 60) or a Dually (Dana 70) you don't have a Dana axle in the back... And the picture doesn't look Dana either.
On a 1/2 ton it's either a GM 10 bolt or a truck 12 bolt. It will not be a 10 bolt in 1977. As I stated earlier the rear axle is a 12 bolt truck axle.
If you don't believe me look here...http://coloradok5.com/axleguide.shtml
8 3/4" 12bolt gasket and cover

enaberif · 01-16-2016, 12:04 PM

Poor shot of transfer case... Need to see it from behind not the side. From first glance I'd say NP203 but without seeing the middle who knows still.

Lowered13 · 01-17-2016, 12:12 PM

Quote:

Originally Posted by hatzie

Can't see enough of the Transfer case to tell. The round cover on a Cast Iron case looks close enough to the same on both the NP203 & NP205 transfer cases to not be a good tell. The giveaway would be that the NP203 has a range box between the transfer case and the transmission.

The front axle is a likely a Dana 44. See the Front Axle Ident guide in post #28. There are zero good pictures of it.

If it's not a 1967-1972 or earlier model (Dana 60) or a Dually (Dana 70) you don't have a Dana axle in the back... And the picture doesn't look Dana either.
On a 1/2 ton it's either a GM 10 bolt or a truck 12 bolt. It will not be a 10 bolt in 1977. As I stated earlier the rear axle is a 12 bolt truck axle.
If you don't believe me look here...http://coloradok5.com/axleguide.shtml
8 3/4" 12bolt gasket and cover

No I do believe you i just though someone said it was a dana because of the limited slip in it. I also knew someone had modified the truck from stock.

**hatzie** · 01-17-2016, 02:57 PM

Limited slip carriers are available for just about every axle put in these trucks.
The front Dana 44 could have Limited slip carrier installed by someone... I did on my 76 for a while.

Lowered13 · 01-21-2016, 10:07 PM

Ok thankyou for all the information.

Lowered13 · 01-21-2016, 11:12 PM

I do have one more question for you sense you seem to know your stuff. What year and model truck would these rims have come on.

01-09-2016, 10:37 AM	#26
Lowered13 Registered User Join Date: May 2012 Location: Bangor Maine Posts: 84	Re: 4x4 Problems This is the front axle. Attached Images

01-09-2016, 10:45 AM	#27
Chevy_mud_truck Registered User Join Date: Feb 2015 Location: Lester West Virginia Posts: 244	Re: 4x4 Problems The rear is a 12 bolt need better picture of the other 2 take one of the cover on the front axle

01-09-2016, 10:14 PM	#29
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: 4x4 Problems front looks like a dana44, I don't see the 10 bolts "ears". The transfer case looks like a NP205. __________________ 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

01-15-2016, 10:51 AM	#30
Lowered13 Registered User Join Date: May 2012 Location: Bangor Maine Posts: 84	Re: 4x4 Problems I am pretty sure they are both dana axles and is a np205 transfer case, it would make sense if they were. I couldn't find the build sheets is there any other of finding out that information. Maybe through Chevy some how?

01-15-2016, 11:43 AM	#31
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,378	Re: 4x4 Problems Post #10 will point you in the right direction. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

01-09-2016, 11:54 AM	#28
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,014	Re: 4x4 Problems Do you have the SPID (Service Parts Idenitification) tag in the glovebox or on the front LH inner fender? The build sheets are usually in the seat springs if it hasn't been swapped. My 76 had a 1980 build sheet in the seat springs. A 1977-80 K10 or K20 could have either an 8 1/2 inch 10bolt or Dana 44 in the front. The 10 bolt will have an Oval cover. The Dana axle covers are an odd hexagon. Dana Axle ID Through 1980 Front Axle ID From GM Quick Req The 77 & 78 front axle identification codes are on page 26 of the 73-78 parts book Identification numbers (bill of material) from DANA. 1967-1978 GM Dana Axle Bill of Material Numbers. Dana Publication X510-8.pdf 1978-1998.5 GM Dana Axle Bill of Material Numbers. Dana Publication X510-9.pdf That rear axle looks like a GM Truck 12 bolt. Not surprising on a 77 K10. The rear axle codes are in the 73-78 parts book pages 27-37. You'll find your ID stamped into the RH axle tube. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 01-16-2016 at 12:31 PM.

01-16-2016, 12:04 PM	#33
enaberif Registered User Join Date: Jan 2009 Location: Calgary, AB Posts: 1,181	Re: 4x4 Problems Poor shot of transfer case... Need to see it from behind not the side. From first glance I'd say NP203 but without seeing the middle who knows still.

01-17-2016, 02:57 PM	#35
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,014	Re: 4x4 Problems Limited slip carriers are available for just about every axle put in these trucks. The front Dana 44 could have Limited slip carrier installed by someone... I did on my 76 for a while. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

01-21-2016, 10:07 PM	#36
Lowered13 Registered User Join Date: May 2012 Location: Bangor Maine Posts: 84	Re: 4x4 Problems Ok thankyou for all the information.

01-21-2016, 11:12 PM	#37
Lowered13 Registered User Join Date: May 2012 Location: Bangor Maine Posts: 84	Re: 4x4 Problems I do have one more question for you sense you seem to know your stuff. What year and model truck would these rims have come on. Attached Images



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