got a full floater for my k20!

[86chevyk20]

So i got a 1 ton full floater i want to stick under my k20 to replace that semi floater. I plan on going through it just to check it out but dont plan to rebuild it except for brakes and lines. some day down the road i will install a posi.


My issue is the axel is 4.11

my front orginal axal is 4.10

Will that small of an difference cause an issue or can i just run them like that??


Liam

 

[Swims350]

nope, had the same issue on extreme 4x4 and he said them being off .01 won't hurt a thing in 4x4.

 

[HotRodPC]

Are you sure that is a 14b Full Floater? Are you sure it's 4.11 and not a 4.10? Or is it possible you have it backwards? IIRC, 14b FF is a 41Ring 10 Pinion, that's 4.10. So if your front is 4.10. But at any rate, to answer your question . 4.10 and 4.11 are fine. Just like 3.07/3.08, 4.56/4.57 are all OK. Shouldn't even make the difference one tire was wore a few thousandths more than another, or 1 tire running 10-15 lbs lower pressure than the rest.

 

[elstm3]

If you did get a 1 ton 14 bolt the spring perches will be in the wrong spot. you will have to cut them off and reweld them about an inch farther out on each side.

 

[86chevyk20]

i was told it was a 4.11 im 90% sure it is but i am going to check. and yes it is a full floater axels bolt in. It came out of a 85 1 ton . when i moved into my shop there was a rotted 85 1 ton there and we cut it up saved the axels and other crap.

Seriously i would have to move the perches in??

 

[HotRodPC]

i was told it was a 4.11 im 90% sure it is but i am going to check. and yes it is a full floater axels bolt in. It came out of a 85 1 ton . when i moved into my shop there was a rotted 85 1 ton there and we cut it up saved the axels and other crap.

Seriously i would have to move the perches in??

It'll be a 4.10 ratio if it's FF. Not in, OUT. 1 ton perches are more inboard.

 

[86chevyk20]

great ! haa.

 

[bucket]

If it's an original '85 axle, the perches should be stamped and can be reused if you're careful cutting them off. If it has cast perches, plan on buying new ones. Also, the shock mounts will need to be moved.

 

[86chevyk20]

why the difference ?? i mean i have a semi floater in it now the frames are the same arn't they?

 

[HotRodPC]

It doesn't have to do with Semi or Full Floater. It has to do with 3/4 and 1 ton. 1/2 and 3/4 ton have the same spring spacing. 1 ton is narrower to allow for bigger spring hangers that push the springs more inboard. Also the shock brackets go in opposite directions on the 3/4 and 1 ton axles.

1/2 and 3/4 tons will swap, 1 ton will NOT. You'd have to move the shock brackets and the spring perches to more outboard toward the brake backing plates if you use a 1 ton axle in a 3/4 ton. Are you sure this axle came from a 1 ton, or did it come from a heavier duty 3/4 ton. The 3/4 tons in the mid to late 80's got either Semi Float and the heavier duty ones got the 14b Full Floater, and all 1 tons got the full floater. Crew Cab Pick Ups, got the Dana 70, and Cab and Chassis 1 tons, got 14b Full Float.

 

[bucket]

why the difference ?? i mean i have a semi floater in it now the frames are the same arn't they?

Yes and no. The frames are the same width, but the 1-ton rails are taller. That doesn't matter here, I was just pointing it out. What does matter is the spring hangers, the 1-ton hangers move the springs closer to the frame for tire clearance on the dually versions. The shocks are also mounted inboard of the rails. The spring perch spacing is 2 inches narrower than 1/2 and 3/4 ton trucks.

 

[bucket]

Crew Cab Pick Ups, got the Dana 70, and Cab and Chassis 1 tons, got 14b Full Float.

DRW pickup got the D70. SRW and DRW Cab&Chassis models were 14 bolt axles (C&C DRW had narrower track due to different hubs).

 

[86chevyk20]

hummmmm. well the truck it came out of had a dana 60 up front so im assuming it was a 1ton.

What about a full floater out of a 3/4 ton?? would i have to do the same issue. because i also have one of those .
and when you say move them more ourbored do you mean i have to cut them off the axle and move them closer to the backing plate??

Im sorry for my inexperience iv been a mechanic for 8 years im just learning somthing new

 

[HotRodPC]

Full Floater from a 3/4 ton is bolt right in. It's ONLY 1tons that are different from 3/4 and 1/2 tons. You can even get a Full Floater out of a 2wd 3/4 ton and it bolts right in.

 

[HotRodPC]

DRW pickup got the D70. SRW and DRW Cab&Chassis models were 14 bolt axles (C&C DRW had narrower track due to different hubs).

Yeah, I always forget to specify, DUAL WHEELS