Squarebody Differentials.

[GreaseDog]

D70HD as in Dana 70??? I was not aware that was available in Squares. Doesn't suprise me about C&C though.

So was it the Dana 44 in K30 for the 73-76. I'll update that info.

full width duallies are generally dana 70s.

Prior to 77, the k30 didn't exist from the factory.

 

[GreaseDog]

I mentioned that because the list at the beginning of the thread showed 82 and newer as having the SF. I do have two older FF's, a '65 corporate and a '69 Dana 44 or 60, not sure on the '69.

Eatons or Danas, there was no corporate rear back then. Ho52 and ho72 come to mind for the eaton model numbers.

 

[HotRodPC]

full width duallies are generally dana 70s.

Prior to 77, the k30 didn't exist from the factory.

That would explain why the K30's didn't get Dana 60 fronts early on. They didn't exist. Someone was selling a 73 K30 with 14b FF and Dana 60 and I told someone to make sure it wasn't a D44 instead of D60, that if it was D60 it's not OEM. And it wouldn't be. So it really wasn't a K30 at all then.

 

[HotRodPC]

Eatons or Danas, there was no corporate rear back then. Ho52 and ho72 come to mind for the eaton model numbers.

So what was in those 67 and 68's for sure, but maybe into early 70's in the 3/4 and 1 tons. They were full floaters and had a drop out 3rd member. Only avaialable in 4.56 and 4.10 ratios, and 4.10 was rare to find. I was told they were GM Corporates long long ago when my dad and bro had them in their 67 and 68's.

 

[bucket]

So what was in those 67 and 68's for sure, but maybe into early 70's in the 3/4 and 1 tons. They were full floaters and had a drop out 3rd member. Only avaialable in 4.56 and 4.10 ratios, and 4.10 was rare to find. I was told they were GM Corporates long long ago when my dad and bro had them in their 67 and 68's.

Those were the Eaton rears, the HO72 I think. From my understanding, the 14FF was based off of them.

 

[DoubleDingo]

Eatons or Danas, there was no corporate rear back then. Ho52 and ho72 come to mind for the eaton model numbers.

Curiosity got the better of me. According to the 1965 Truck Shop Manual Supplement they had Chevrolet Single Speed axles rated at 3300 and 3500; 5200, 7200 and 11,000; 13,500; 15,00 and 17,000 pounds.

A Chevy Two Speed axle

Eaton Single Speed

Eaton Two Speed

Timken Single Speed

Timken Two Speed

 

[DoubleDingo]

So what was in those 67 and 68's for sure, but maybe into early 70's in the 3/4 and 1 tons. They were full floaters and had a drop out 3rd member. Only avaialable in 4.56 and 4.10 ratios, and 4.10 was rare to find. I was told they were GM Corporates long long ago when my dad and bro had them in their 67 and 68's.

The 1969 Dana 60 I have is full floater and has 3:54 gears. Cruises at 70 mph turning 2600 rpm's 245/75r16's. Great axle and bought it for $20 in 1990. Had to hacksaw the rear springs because I didn't have any tools with me that could bust loose the bolts. That was a good workout! Never pulled the cover, just added gear oil and ran it until the truck rolled 2005. Probably put 150,000 miles on it like that.

 

[GreaseDog]

Curiosity got the better of me. According to the 1965 Truck Shop Manual Supplement they had Chevrolet Single Speed axles rated at 3300 and 3500; 5200, 7200 and 11,000; 13,500; 15,00 and 17,000 pounds.

A Chevy Two Speed axle

Eaton Single Speed

Eaton Two Speed

Timken Single Speed

Timken Two Speed

No light truck 2 speed rear axles to my knowledge, so no corporate axles in light trucks.

 

[smurph20]

A buddy of mine just traded a 68 ton truck that was a dually. The rear axle had square axle tubes and was stamped GM with a gm part number. Any clue?

 

[crazy4offroad]

Square tubes usually means 2.5 ton Rockwells.

 

[smurph20]

No this was a regular 8 lug hub dually rear. It had a renmovable third member and a removable back plate weird i know. But it diffently wasnt rockwell lol

 

[HotRodPC]

What ton was the truck? You missed that up there. 1/2 ton, 3/4 or what? The 3/4 and 1 tons in 68 had the drop out 3rd member and removable back cover with full floating axles. I was always told that was GM Corp. Grease is saying it's Eaton.

 

[DoubleDingo]

What ton was the truck? You missed that up there. 1/2 ton, 3/4 or what? The 3/4 and 1 tons in 68 had the drop out 3rd member and removable back cover with full floating axles. I was always told that was GM Corp. Grease is saying it's Eaton.

Got the Motors Truck Repair Manual out, and in the Chevy Truck section they refer to Timken. Turned to that section of the book and Timken (Rockwell) Driving Axles have square tubes but the tubes and housing are one solid unit. It doesn't provide information on what truck it came from, just how to service it. The Eaton section didn't have a photo of the tube and housing but those appeared to be for service trucks with tandem axles or two speed axles, but there was the single speed axle too. In the Chevy section there is info on the Salisbury Type Semi Floating Axle used from 1963 to 1970. The Dana 60 looked the same as the Salisbury except it was semi floater in C10 with 396 V8, in the C20 it was full floater. Looking at the cut-away views, the semi floater has a longer nose and the full floater has the stubby nose where the driveshaft bolts up.

 

[smurph20]

Yea it was a 1 ton truck.

 

[HotRodPC]

Very nice list.

To add, the D70HD came in 20 & 30 series pick up duallies. A cab & chassis dually could have either a D70HD or 14 bolt depending on the configuration ordered.

Also a K30 w/ a front D60 was not available until 77.

Here is the quote I was looking for. Someone was saying K30 really didn't exist in a GM OEM form until 77, so that might be why any info you have found saying Dana 60 wasn't available in K30 until 77.