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Old 10-23-2021, 08:32 PM   #1
Johnl48
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Slip on or press on drums ?

I'm doing an axle swap to a 14 bolt 1 ton. The axle came without drums. In order to know what disc brake kit to order I need to know if they were slip on or press on. Can you tell by looking at hubs ?

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Old 10-23-2021, 09:06 PM   #2
sweetk30
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Re: Slip on or press on drums ?

What year is stamped in ring gear is a big help .

But from what i can see on my phone zoomed in there early press on drum .

Were the wheel sits there is just 1 surface for the wheel center to register on and center up .

If they were slip on drum or even newer disc there would be two lip step . 1 for drum or disc and 1 for wheel .

And you look on the back side note the machined lip for the drum to center up .

Anymore better option is use a 99-newer 14ff from gas engine trucks . Same basic axle but disc brake AND parking brake . Just need 14x1.5mm lug nuts . And new leaf spring perches and shock mounts .
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Old 10-23-2021, 09:09 PM   #3
Johnl48
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Re: Slip on or press on drums ?

Quote:
Originally Posted by sweetk30 View Post
What year is stamped in ring gear is a big help .

But from what i can see on my phone zoomed in there early press on drum .

Were the wheel sits there is just 1 surface for the wheel center to register on and center up .

If they were slip on drum or even newer disc there would be two lip step . 1 for drum or disc and 1 for wheel .

And you look on the back side note the machined lip for the drum to center up .

Anymore better option is use a 99-newer 14ff from gas engine trucks . Same basic axle but disc brake AND parking brake . Just need 14x1.5mm lug nuts . And new leaf spring perches and shock mounts .
So is it just the hub that's different between the slip on and press on or is the housing different also ?
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Old 10-24-2021, 01:09 AM   #4
57taskforce
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Re: Slip on or press on drums ?

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Originally Posted by Johnl48 View Post
So is it just the hub that's different between the slip on and press on or is the housing different also ?
Those are press on drum. The Hubs and drums are the only difference between slip and press. The housings have changed a bit thru the years as well.
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Old 10-27-2021, 09:20 PM   #5
sweetk30
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Re: Slip on or press on drums ?

NO THERE IS A MAJOR CHANGE

i found this out the hard way 1 time . i had all the parts to go disk from a mid 70's i had with aftermarket kit . i wanted to install on a 96 c3500 truck and the newer with slip on drums and i found out the hard way the spindles are different and the bearings are set a little closer together .

and even in the aftermarket world there is 2 specific kits .
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 10-27-2021, 09:28 PM   #6
Johnl48
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Re: Slip on or press on drums ?

Guy from lugnut told me the only difference in the kit are the rotors and caliper brackets. I was told however the housing after 1988 was 2" wider. No idea if that's true
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Old 10-27-2021, 11:59 PM   #7
57taskforce
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Re: Slip on or press on drums ?

Quote:
Originally Posted by sweetk30 View Post
NO THERE IS A MAJOR CHANGE

i found this out the hard way 1 time . i had all the parts to go disk from a mid 70's i had with aftermarket kit . i wanted to install on a 96 c3500 truck and the newer with slip on drums and i found out the hard way the spindles are different and the bearings are set a little closer together .

and even in the aftermarket world there is 2 specific kits .

Ahh yes! I may had forgotten that the slip on drums use different hubs and spindles. I knew the later factory disk spindles where shorter and used different bearing spacing than the pressed drum spindles but I had forgot the slip on drums used the shorter spindle too. Thanks for setting it straight! I went thru all this when I put the 01+ 10.5” 14 bolt factory disk setup on my ‘89 square body 14 bolt pressed drum rear axle.
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‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206
'98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's
‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue
‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0

Last edited by 57taskforce; 10-28-2021 at 12:14 AM.
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