Full floater ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greenhorn male · 03-01-2005, 01:31 AM

72 c20 I parted out has a 14b full floater from a later truck. I read somewhere that 1 ton 14b spring perches line up with our trucks so I am assuming this is a 1 ton axle. The drums are huge but the shock mounts are different. The previous owner I beleive said it had 307 gears. I'm not sure what it came out of. How do I tell for sure if this is a 1 ton and how do I check the actual gear ratio.

I also read here (I beleive Longhorn man stated), if I didn't misunderstand that all 3/4 tons (67-72) with a full floater and 350/350 engine combo had a 410 gear ratio is this true. My 72 GMC has a 10 bolt full floater. I beleive it is a Dana 60 (the cover is not round, looks similar to a dana 44 cover).

Question: if the 14 bolt is a 1 ton with the 307 gear ratio and non-posi, is it worth swapping it into my GMC (I have the drivelines as well from the donor) if it is a 410 ratio dana 60 (working condition). The e-brake cables seem to match.
What, if any, are the advantages? Disadvantages?

Thanks!

1969 GMC · 03-01-2005, 01:59 AM

the 14 bolt is stronger than the D60 in just about every way, but if the D60 under your truck is doing fine then there is no need to swap it out.

greenhorn male · 03-01-2005, 10:34 AM

What about the gear ratios. do the 14b come with that steep of a ratio and would that be preferrable or not on a not too daily driver. Would the a 410 Dana be stronger for towing than a 307 14 bolt? I just want to make sure i don't regret selling the 14 bolt.

**JIMs70GMC** · 03-01-2005, 07:08 PM

Not that simple(67-72), the 2wd trucks are 42" from center to center, the 4wds are 40" and a 73 up one ton is 40.5". So if you have a 2wd truck w/ a 14 bolt that was not molested than it probably came back from 3/4 ton.

LONGHAIR · 03-01-2005, 07:47 PM

I'm confused, I've never heard of a Dana60 being called a 10 bolt full-floater?

**JIMs70GMC** · 03-01-2005, 08:06 PM

It has 10 bolts holding on it's cover, but then again so does the H052.

86SILVERADO · 03-01-2005, 09:02 PM

The 14 bolt will have 3.73 gearing at the highest. If so it would be slightly better for you gas mileage wise but it is nothing you couldn't make up for with taller tires on your Dana60. To check the 14bolt just prop it up and spin one tire around while watching the yoke. the yoke will probably spin four times to one complete tire revolution. Almost all 14bolts had 4.10 gears you had to request 3.73.

69 longhorn · 03-01-2005, 09:18 PM

Quote:

Originally Posted by LONGHAIR

I'm confused, I've never heard of a Dana60 being called a 10 bolt full-floater?

Yup, the Dana 60 has 10 bolts on the cover & the ring gear! On the 14 bolt, I didnt know you could get one higher than a 3.42 gear(3.73 was the norm on a 3/4 ton truck)........69L

1969 GMC · 03-01-2005, 10:04 PM

you can get 3.21's at the highest, and 5.13s at the lowest, for the 14 bolt. although the word on the block is that there are some 5.38's coming soon.

greenhorn male · 03-02-2005, 12:35 AM

Quote:

Originally Posted by JIMs70GMC

Not that simple(67-72), the 2wd trucks are 42" from center to center, the 4wds are 40" and a 73 up one ton is 40.5". So if you have a 2wd truck w/ a 14 bolt that was not molested than it probably came back from 3/4 ton.

Jim...Are you saying the 73 up 3/4 ton 14 bolts were also 42" center to center. I am assuming you are talking about leaf spring perches, right? I guess I need to do more homework and crawl under there and do some measurements and count tire/axle turns. I'm almost certain the PO said this had 307 gears, but I guess from the answers here it is not possible.

**kwmech** · 03-02-2005, 01:30 AM

Quote:

Originally Posted by greenhorn male

Jim...Are you saying the 73 up 3/4 ton 14 bolts were also 42" center to center. I am assuming you are talking about leaf spring perches, right? I guess I need to do more homework and crawl under there and do some measurements and count tire/axle turns. I'm almost certain the PO said this had 307 gears, but I guess from the answers here it is not possible.

If it is a 14 bolt 3.07s were NEVER an option. 3.21s are rare. 3.73, 4.10, and 4.56 are the most popular

**JIMs70GMC** · 03-02-2005, 07:20 AM

Yep right at 42"

LONGHAIR · 03-02-2005, 07:23 AM

Oh, I wasn't disputing the actual bolt count..........just never heard it called that.
It just seemed funny..........Like refering to how many studs hold the center section in a 9" Furd. Why bother? It already has a common name?

greenhorn male · 03-02-2005, 11:34 AM

Quote:

Originally Posted by LONGHAIR

Oh, I wasn't disputing the actual bolt count..........just never heard it called that.
It just seemed funny..........Like refering to how many studs hold the center section in a 9" Furd. Why bother? It already has a common name?

I'm probably the only one that has called it that, lol. Not knowing what I have,
I was just describing it.

Jim, thanks for the clarification, I must have misunderstood what I read on a 4 wheeling board. I was searching 14 bolt and dana 60 info and nothing but 4wd forums pop up in my search. Now I know what I have.

Besides spring perch location, what is the difference between a 1T and 3/4T full floating axles?

**JIMs70GMC** · 03-02-2005, 07:38 PM

Quote:

Besides spring perch location, what is the difference between a 1T and 3/4T full floating axles?

In pre 72 vehicles and non-dana60 rear trucks the only difference is spring spacing and the size of the brakes.

03-01-2005, 01:31 AM	#1
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	Full floater ??? 72 c20 I parted out has a 14b full floater from a later truck. I read somewhere that 1 ton 14b spring perches line up with our trucks so I am assuming this is a 1 ton axle. The drums are huge but the shock mounts are different. The previous owner I beleive said it had 307 gears. I'm not sure what it came out of. How do I tell for sure if this is a 1 ton and how do I check the actual gear ratio. I also read here (I beleive Longhorn man stated), if I didn't misunderstand that all 3/4 tons (67-72) with a full floater and 350/350 engine combo had a 410 gear ratio is this true. My 72 GMC has a 10 bolt full floater. I beleive it is a Dana 60 (the cover is not round, looks similar to a dana 44 cover). Question: if the 14 bolt is a 1 ton with the 307 gear ratio and non-posi, is it worth swapping it into my GMC (I have the drivelines as well from the donor) if it is a 410 ratio dana 60 (working condition). The e-brake cables seem to match. What, if any, are the advantages? Disadvantages? Thanks! __________________ 03 Tahoe 72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays.

03-01-2005, 01:59 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	the 14 bolt is stronger than the D60 in just about every way, but if the D60 under your truck is doing fine then there is no need to swap it out. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

03-01-2005, 10:34 AM	#3
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	What about the gear ratios. do the 14b come with that steep of a ratio and would that be preferrable or not on a not too daily driver. Would the a 410 Dana be stronger for towing than a 307 14 bolt? I just want to make sure i don't regret selling the 14 bolt. __________________ 03 Tahoe 72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays. Last edited by greenhorn male; 03-01-2005 at 04:55 PM.

03-01-2005, 07:08 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Not that simple(67-72), the 2wd trucks are 42" from center to center, the 4wds are 40" and a 73 up one ton is 40.5". So if you have a 2wd truck w/ a 14 bolt that was not molested than it probably came back from 3/4 ton. __________________ 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

03-01-2005, 08:06 PM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	It has 10 bolts holding on it's cover, but then again so does the H052. __________________ 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

03-01-2005, 07:47 PM	#5
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	I'm confused, I've never heard of a Dana60 being called a 10 bolt full-floater?

03-01-2005, 09:02 PM	#7
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	The 14 bolt will have 3.73 gearing at the highest. If so it would be slightly better for you gas mileage wise but it is nothing you couldn't make up for with taller tires on your Dana60. To check the 14bolt just prop it up and spin one tire around while watching the yoke. the yoke will probably spin four times to one complete tire revolution. Almost all 14bolts had 4.10 gears you had to request 3.73. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

03-01-2005, 10:04 PM	#9
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	you can get 3.21's at the highest, and 5.13s at the lowest, for the 14 bolt. although the word on the block is that there are some 5.38's coming soon. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

03-02-2005, 07:20 AM	#12
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Yep right at 42" __________________ 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

03-02-2005, 07:23 AM	#13
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Oh, I wasn't disputing the actual bolt count..........just never heard it called that. It just seemed funny..........Like refering to how many studs hold the center section in a 9" Furd. Why bother? It already has a common name?



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