C20 Rear... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

FuelCellGuy · 06-02-2005, 09:16 PM

Do the C20 diffs have bigger axles that the C10's?? That may be what I have... I need a C10 rear 6 OR 5 lug. If the C20's have bigger axles, then that would explain why the 5 lug axles I have won't fit the diff that I currently have. Maybe I just confused everyone.

Someone help! Later, Mark

68w/sbc406 · 06-02-2005, 09:20 PM

i am not confused, i just dont have the answer for you

Longhorn Man · 06-02-2005, 09:28 PM

The c/20 axle is nothing like the C/10 axles.
The 20 bolts to the hub and has splines on the oposite end.
a 10 axle has splines on the inner end, and a c clip on the same end to retain it.

FuelCellGuy · 06-02-2005, 09:40 PM

Was there a C10 "Heavy Half"?? or maybe a C10 Camper Special??

**kwmech** · 06-02-2005, 10:25 PM

Not very likely.

WRMZ71 · 06-02-2005, 10:48 PM

hey fuelcell guy i seen your wanting to buy 5 lug 12 bolt rearend in the parts board. I'm up in Oklahoma City and I might have one for you, but its at my buddies junkyard. I'll ask him tomorrow and see if he still has it and then i'll let you know.

Longhorn Man · 06-02-2005, 11:03 PM

Heavy half....that was later...late 70's early 80's.
Custom Camper...nothing but HD springs, shocks tires and a sway bar. That's it.

67_C-30 · 06-02-2005, 11:43 PM

Some 1/2 Tons came with 12 bolt GM rears and some had Dana 44's. That may be your problem. You may have Dana 44 axles and a 12 bolt rear, or vice versa. Look at you rear diff and count the bolts. If it has 12, it is a 12 bolt (you probably had that covered, huh?

) and if it has 10, it would be the Dana 44. I've never seen a Dana 44 with the coils springs in a 1/2 ton, but I'm not sure if they only came that way. The rear covers should look like either of the 2 below.

DANA 44

12 BOLT

FuelCellGuy · 06-03-2005, 07:27 AM

67_C-30, I know for a fact that it is a regular 12 bolt. I could use the diff that I have but I would have to have the axles redrilled.

WRMZ71, yea, check into that if you will.

Thanks to all, Mark

neonlarry · 06-03-2005, 07:57 AM

How are the axles too big? Too long, Too big around, What?

FuelCellGuy · 06-03-2005, 10:07 AM

The ones in the housing now have a larger diameter spline than the one I bought that were supposed to be 71-72 axles. That's kinda where I am at.

WRMZ71 · 06-03-2005, 07:31 PM

fuelcellguy - My buddy knows he sold one of those 12 bolt 5 lugs but think he might have one left. I'll let you know as soon as I do.

06-02-2005, 09:16 PM	#1
FuelCellGuy FUEL CELL GURU Join Date: Aug 2003 Location: Mineola, Texas Posts: 993	C20 Rear... Do the C20 diffs have bigger axles that the C10's?? That may be what I have... I need a C10 rear 6 OR 5 lug. If the C20's have bigger axles, then that would explain why the 5 lug axles I have won't fit the diff that I currently have. Maybe I just confused everyone. Someone help! Later, Mark

06-02-2005, 09:20 PM	#2
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	i am not confused, i just dont have the answer for you __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

06-02-2005, 11:43 PM	#8
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Some 1/2 Tons came with 12 bolt GM rears and some had Dana 44's. That may be your problem. You may have Dana 44 axles and a 12 bolt rear, or vice versa. Look at you rear diff and count the bolts. If it has 12, it is a 12 bolt (you probably had that covered, huh? ) and if it has 10, it would be the Dana 44. I've never seen a Dana 44 with the coils springs in a 1/2 ton, but I'm not sure if they only came that way. The rear covers should look like either of the 2 below. DANA 44 12 BOLT __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 06-02-2005 at 11:44 PM.

06-03-2005, 07:57 AM	#10
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	How are the axles too big? Too long, Too big around, What? __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

06-02-2005, 09:28 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	The c/20 axle is nothing like the C/10 axles. The 20 bolts to the hub and has splines on the oposite end. a 10 axle has splines on the inner end, and a c clip on the same end to retain it.

06-02-2005, 09:40 PM	#4
FuelCellGuy FUEL CELL GURU Join Date: Aug 2003 Location: Mineola, Texas Posts: 993	Was there a C10 "Heavy Half"?? or maybe a C10 Camper Special??

06-02-2005, 10:25 PM	#5
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	Not very likely.

06-02-2005, 10:48 PM	#6
WRMZ71 Cause the Chicks DIG IT!! Join Date: Nov 2003 Location: Beaufort SC Posts: 509	hey fuelcell guy i seen your wanting to buy 5 lug 12 bolt rearend in the parts board. I'm up in Oklahoma City and I might have one for you, but its at my buddies junkyard. I'll ask him tomorrow and see if he still has it and then i'll let you know.

06-02-2005, 11:03 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Heavy half....that was later...late 70's early 80's. Custom Camper...nothing but HD springs, shocks tires and a sway bar. That's it.

06-03-2005, 07:27 AM	#9
FuelCellGuy FUEL CELL GURU Join Date: Aug 2003 Location: Mineola, Texas Posts: 993	67_C-30, I know for a fact that it is a regular 12 bolt. I could use the diff that I have but I would have to have the axles redrilled. WRMZ71, yea, check into that if you will. Thanks to all, Mark

06-03-2005, 10:07 AM	#11
FuelCellGuy FUEL CELL GURU Join Date: Aug 2003 Location: Mineola, Texas Posts: 993	The ones in the housing now have a larger diameter spline than the one I bought that were supposed to be 71-72 axles. That's kinda where I am at.

06-03-2005, 07:31 PM	#12
WRMZ71 Cause the Chicks DIG IT!! Join Date: Nov 2003 Location: Beaufort SC Posts: 509	fuelcellguy - My buddy knows he sold one of those 12 bolt 5 lugs but think he might have one left. I'll let you know as soon as I do.



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