14 bolt swap question

[FrankieD61]

Hey all,

My truck is a 93 Chevy K1500, 4wd.

I just finally got my new 14 bolt SF swapped in and I noticed the leaf springs are very close to the tires. Any reason why this would be?

 

[GoToGuy]

Did you relocate the original mount locations on the axle? Is the new axle narrower, ( axle flange to axle flange width ) than your previous? Start with the obvious, basic dimensions, and compare.

 

[FrankieD61]

Did you relocate the original mount locations on the axle? Is the new axle narrower, ( axle flange to axle flange width ) than your previous? Start with the obvious, basic dimensions, and compare.

I didn’t have to relocate anything. The spring perches and shock mounts lined up perfectly. This rear was from a 4wd truck so everything fit well. I pre measured everything before I ripped it all apart. The only difference I notice is the axle appears to be narrower but it’s not the backing plates are just set back a little further than the 10 bolt to make up for the difference in the drum size.

 

[FrankieD61]

I did replace the leaf springs but that should not make a huge difference.

 

[Caman96]

I didn’t have to relocate anything. The spring perches and shock mounts lined up perfectly. This rear was from a 4wd truck so everything fit well. I pre measured everything before I ripped it all apart. The only difference I notice is the axle appears to be narrower but it’s not the backing plates are just set back a little further than the 10 bolt to make up for the difference in the drum size.

How certain are you this is from a 4WD? What is width of axle from wheel mounting surface to other WMS?
Post some pictures too.
If it’s that noticeable, it sounds like a 2wd axle which is narrower by i think 3”.

 

[FrankieD61]

How certain are you this is from a 4WD? What is width of axle from wheel mounting surface to other WMS?
Post some pictures too.
If it’s that noticeable, it sounds like a 2wd axle which is narrower.

The width from hub to hub? If it was a 2wd wouldn’t the spring perches and shock mounts be different? I’ll post some pics soon.

 

[Caman96]

The width from hub to hub? If it was a 2wd wouldn’t the spring perches and shock mounts be different? I’ll post some pics soon.

I thought they were the same, which is why it’s critical to get whichever axle 4WD/2WD you need. You need to confirm WMS to WMS.

 

[FrankieD61]

Yea, before I purchased it I made sure the place was selling me one off of a 4wd truck. I even called them back and they said yup pulled a 4wd version… once the rain stops I’ll get some pictures.. what are the measurements supposed to be? If I have the wrong rear, I’m gonna scream… lol

 

[Caman96]

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GM Corporate 8.5" 10 Bolt Semi-Floating Axle - GMT400 Information

This is the well known "10 bolt", so named for the number of bolts on the rear cover. The majority of C/K1500 trucks were equipped with this rear axle. Not to be confused with the passenger car 8.5" differential, or the various other 10 bolts, the truck version is significantly stronger. It...

gmt400.info

The confusing part for the junkyard experts is even though the semi-float is 2wd, it’s a 6 lug. So they just assume, based on that.

 

[FrankieD61]

I figured it out…… I’m a complete moron. I didn’t put the drums on.. in my defense my brain has been consumed with other life stuff.. so sorry but thank you…