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difference in 3/4 ton and 1 ton 14 bolt ff

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frankthtanc

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Ok im trying to locate a 14 bolt ff from the junkyard to swap into my 85 k5 blazer which has 1/2 bolts now. I want a 3/4 ton but how can i tell the difference between a 3/4 ton and a 1 ton 14 bolt ff when searching the junkyards???? Also what are the differences between the two?
 
frankthtanc said:
Ok im trying to locate a 14 bolt ff from the junkyard to swap into my 85 k5 blazer which has 1/2 bolts now. I want a 3/4 ton but how can i tell the difference between a 3/4 ton and a 1 ton 14 bolt ff when searching the junkyards???? Also what are the differences between the two?
Click to expand...

The easiest would be to look for the truck that has badging on stil and it will be 20 if chevy, and 25 if GMC, or if the newer trucks it's 2500.
10 or 15 would be 1/2 ton, and 30 or 35/3500 would be one ton.
The other way to verify is to measure the width of the spring pads sepreation, they should be 42.5" from center to center, or easier from one edge to the other but the same side edge meaning from the outside of one to the inside of the other.:D
If it's 40.5" it's a 1 ton
 
the 10.5" ring gear 14bolt Full-Floater's differential comes down to a point in the center and its little brother, the semi-float 9.5" ring gear 14bolt has a more rounded differential housing ( looks alot like a GM corporate 12-bolt from behind,only bigger)

Plus the hubs are a dead give away. The Full Floater has massive hubs that stick out through the wheel hole opening where the wheel bolts to the axle. The semi-float 14 bolt's hub does not pertrude through the wheel opening. It is flush with the mounting surface.

The full-floaters were used liberally throughout the 70's on 3/4 and 1-ton trucks. In the 80's 3/4-ton trucks I've alot more of the smaller 9.5" semi-float 14's used.

Anyone have any side by side pics to help show the obvious visual differences to help this guy out?
 
G-Force8 said:
the 10.5" ring gear 14bolt Full-Floater's differential comes down to a point in the center and its little brother, the semi-float 9.5" ring gear 14bolt has a more rounded differential housing ( looks alot like a GM corporate 12-bolt from behind,only bigger)

Plus the hubs are a dead give away. The Full Floater has massive hubs that stick out through the wheel hole opening where the wheel bolts to the axle. The semi-float 14 bolt's hub does not pertrude through the wheel opening. It is flush with the mounting surface.

The full-floaters were used liberally throughout the 70's on 3/4 and 1-ton trucks. In the 80's 3/4-ton trucks I've alot more of the smaller 9.5" semi-float 14's used.

Anyone have any side by side pics to help show the obvious visual differences to help this guy out?
Click to expand...

He asked about the difference between the 14bff in the 3/4 ton and the 1 ton.
They are both 10.5" ring, the differences are in the spring pad locations.
There are also different size drums but I have seen the smaller drums on 1 tons so it's anybody's guess there.
 
frankthtanc said:
Ok im trying to locate a 14 bolt ff from the junkyard to swap into my 85 k5 blazer which has 1/2 bolts now. I want a 3/4 ton but how can i tell the difference between a 3/4 ton and a 1 ton 14 bolt ff when searching the junkyards???? Also what are the differences between the two?
Click to expand...


I don't see anything about ONLY being concerned about spring perch width. He originally asked about the differences between the 3/4 ton 14 bolt and 1-ton 14 bolt. A very general question.He sounds like he doesn't know that there are two different breeds available in the 3/4 tons. We'll wait and see.

ALL 1-tons had the 10.5" 14. Some 3/4 tons had the 9.5" and some had the 10.5".Both are very different creatures. The 9.5" is a c-clip semi-float axle which is much weaker than the 10.5" full-float 1-ton version

They are not ALL 10.5"ers:haha:
 
thanks guys for all of the help. i knew about the difference in the 9.5 and the 10.5, i just was not sure on the 1 ton and 3/4 ton. i think i have found one at the junkyard sitting under an 80's model chevy scottsdale 20 crewcab. The guy is going to cut it out and give it to me for $100.00. It looks good and is the only one i have found in my area. Sound like the one im looking for imiceman44?
 
G-Force8 said:
I don't see anything about ONLY being concerned about spring perch width. He originally asked about the differences between the 3/4 ton 14 bolt and 1-ton 14 bolt. A very general question.He sounds like he doesn't know that there are two different breeds available in the 3/4 tons. We'll wait and see.

ALL 1-tons had the 10.5" 14. Some 3/4 tons had the 9.5" and some had the 10.5".Both are very different creatures. The 9.5" is a c-clip semi-float axle which is much weaker than the 10.5" full-float 1-ton version

They are not ALL 10.5"ers:haha:
Click to expand...
read it again:
frankthtanc said:
Ok im trying to locate a 14 bolt ff from the junkyard to swap into my 85 k5 blazer which has 1/2 bolts now. I want a 3/4 ton but how can i tell the difference between a 3/4 ton and a 1 ton 14 bolt ff when searching the junkyards???? Also what are the differences between the two?
Click to expand...
Don't you see "ff" after the 14bolt every time he says 14b there is a ff after it.
That means full float that means it's the 1.5" and that means it's not the sf 9.5"
Common, if you missed it and I corrected you leave it at that.
:D
 
hunterguy86 said:
Weren't all crewcabs 1 tons?
Click to expand...
Actually no.
Some crewcabs in the early years were offered in 3/4 ton but I think it was only 2wd.
The first few years before the D60 was introduced, the crew cabs had a D44 HD with a dually hub adapter. :o
 
I know someone out there believes that Burbans didn't have 14 bolt ff's, but mine did.

I hope this helps.

Go 1 Ton!
 
Also keep in mind that shock mounting may be different between 2WD and 4WD. 2WD lower shock mounts hang down a lot more.
 
54inches said:
I know someone out there believes that Burbans didn't have 14 bolt ff's, but mine did.

I hope this helps.

Go 1 Ton!
Click to expand...

I pulled my 14ff out of an 85 burb.

Shock mounts are different between the 3/4 and 1 ton and also different between 2WD and 4WD.
 
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