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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by misfit, Jan 14, 2003.
after you went from drum to disc? standard 14 bolt FF. has anyone measured the weight difference?
I read somewhere that it is 70 lbs.
Like POWERMAD says....around 70-75 lbs. lighter. /forums/images/graemlins/thumb.gif
That sounds about right for me also. /forums/images/graemlins/grin.gif
doing work on mine before I hang it, I'm trying to lighten it up.I have it all apart and weighed all the parts.
axle housing...187 lbs
axle long.....17-1/4 lbs
axle short....15 lbs
brake plates..44 lbs
My numbers so far..
axle....need to recheck after doing this(187)
axle long.....17 lbs....gun drilling will change this
axle short....14-3/4 ...gun drilling
total so far..321 lbs
wow, 389 so far, minus diff unit and gears and bearings and such ?
those caliper brackets: are they made of perfectly flat steel stock ?
the diff unit, gears and bearings are in the axle housing at 187 lbs....the caliper plates are ground flat...
I think 70lbs is about right.. every little bit counts, and 70lbs is substantial in that game, especially on the axle!
tonyp, i like how you profiled your diff...
Oh yeah. I think every bit counts. Since I put my Blazer on a diet, I have noticed a huge difference. I'm always looking for ways to shave the weight. (without going broke). /forums/images/graemlins/grin.gif
Curious... how did you lose 13 lbs on the hubs? That's quite a bit.
I had to turn the outside dia of the hub to allow my 6 lug rim to fit over it, then I cut the inside of the hub(where the drum sits) to move my rotors into the rim more....if you can see in the pic I also cleaned the inside bolt pattern of the hub up, it had a big chunk of steel between two of the holes where the mold gate was....
I'm curious, what did you turn the outside of the hub down to? I'm trying to figure out how small I can go without worrying about anything. I was planning on 4.125".
What rotor did you use?
I want to use a plain-jane 10 bolt 6 lug rotor but I think I might end up using a IFS rotor because it has a hole in the middle that is bigger. I'm trying to find a no-brainer solution that doesn't require machining rotors each time I do a brake job. I'd really like to make it so I had the same disks, calipers, and pads front and rear but I don't know if I'm going to be able to pull it off.
your hole size is right, the hub is so thick out there it will change very little, remember that you will have to turn down your axle flange too. The rotors I used are 8 lug and I have the info at home on what there from(will get that for you tonight).They were only 1.225" wide, I had to find a thin rotor to fit the ford calipers I'm using, but they are thinner then the chevy rotors guys are getting.
In the middle of my disc conversion now. Has anybody crossdrilled these discs? Thought it would look pretty trick plus a little less weight and cool better. Is this something that can be done without causing any problems anywhere else? None that I can think of but Maybe I'm missing something... /forums/images/graemlins/smirk.gif
Yeah, they're pretty thick and I didn't think they'd miss 3/8" of steel but I was really hoping to get it down to 4".. but I think I might be pushing it.
Do you think a 10 bolt/Dana 44 6 lug rotor would fit? I can't remember how big of a hole is in the rotors, I just remember it was bigger than the 3.5" hub diameter. I'm kind of worried about machining the backside of the hubs down too small.
It kind of sucks that I don't have any of that stuff here. It's all 500 miles away.
By any chance did you use late seventies F350 rotors?
Thanks for the info.
I turned the hubs down to 4.250", thats the size of the hole in my 6 lug rim.
If you put that rotor on it only has 6 lugs, so you would need some kind of ring or something to hold it on.
I have my hugs here, I'll take a look at how thick the back side is......
be carefull drilling rotors as some are pressed together, solid rotors are crossed drilled, but vented rotors are vented to cool. I've seen rotors with cuts on the sides so you could look at it and see the bolts.....
i still have 14 bolt disc brake brackets for sale. pm me or go to my sig
is that a stock diff cover? it looks like you wouldn't have the same problem i did when my spider gears shot through my diff cover and leaked diff oil all over my driveway, and for over a month now i've ben trying to get rid of the massive oil slick in it.
i drove 5 miles home, AFTER i broke the spider gears, yet only 4 feet into my driveway did the gears get shot through the cover, so al 5 quarts or however much were in my driveway. that truck hates me.
if that's not a stock cover, where'd you get it?
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