I appologize if this comes off as a newbie question. If it really offends anyone that bad, please let me know and I will delete and move to newbie. I am just trying to get a quick response so I can get these in soon.

I am transfering the disc converson from my old 9" to my new one, but am having a hard time finding the caliper brackets to mount to the 9". I checked A&A Manufacturing but they need measurments, and unfortunately I am not around my Jeep right now, so I can't get them. I need to order these today! but can't get to my Jeep to take measurments untill around 6 tonight. I am sure that there has to be someone on this board, or someone that has a friend that has done this conversion. I either need measurments or a place that just sells the conversion so I can buy the brackets already made. And, this is for cadillac calipers and rotors. My other brackets were made by a friend, and unfortunately I don't have the resources to make them again.

If somone could please help me out soon, it would be greatly appreciated.

Matt

Since you stated the 9" was under a Jeep, I'm thinking that it's not original equipment. What year and model did the 9" come from? Bronco, car, truck...believe it or not, it matters because they all varied somewhat with respect to the housing flange pattern and axle offset, two very important things to know when you're doing a disc brake swap.

The 9" that is under there now came from an EB 28 spline, small bearing, banjo style housing (round housing not the newer trussed style). The axle tubes also tapered down to something like 3" or a little smaller. The new 9" is a 31 spline, big bearing, non-banjo. I just pulled this from a yard last weekend from I believe was either an 80's to early 90's two wheel drive truck, didn't really pay attention. I don't know if this will make a difference or not, but the new one did have a posi in it.

Matt

Your flange mounting pattern should be 3.5 across the bottom by 2.375 high. The hole diameters (bolt size) went from 1/2" to 3/8" in 1978, so yours should be 3/8", although there's nothing keeping you from drilling out a bracket to fit if that's the only problem. Most bolt on bracket manufacturers will require that you use the rotor they specify, whereas you can get around that sometimes with the weld-on varieties.

Offset I'm not sure about, whether it varied between 2wd and 4wd. As a side note, don't get too attached to the Ford Trac-Loc "posi" , they don't last very long in my experience.

Which measurements does A-A Mfg need? Specifically. If I was at home, I'd go measure one of my three for you but I'm not. Anybody have one handy?

Well it looks like I not going to have the best luck with ordering the parts today. Apogee, thanks for the assistance though. Teaches me for leaving all my info back at the shop last night. To tell you the truth I am not exactly sure what measurments A&A wants, but am guessing the roter diameter, axle tube diameter, and the center to center mounting holes for the caliper to the bracket. When I talked to the guy he seemed a little confused.

As far as that posi goes, it is going onto e-bay to hopefully bring in a little $. I have a detroit that is going in place of that.

Also, if anyone has any sources in the meantime, please post 'em up. Whether it be a complete conversion (I'll just spend the $), or just a source for the bracket.

I was able to come across this: http://www.speedwaymotors.com/xq/asp/strBase_List.%2791641005%27%2C%2791031046%27%2C%27 91031933%27/hilt.91641010/source./base_no.91641005/str_base_no.91031046%2C91031933%2C91641005%2C/header_title.Part+Number+Search/page_name.base%5Flist%5Fdisplay%2Easp/search_type./search_option./deptsearch./deptSearch_id./dept_id./dept_id_p./dept_name./dept_name_p./ShowImages.yes/sq./cont.1/intPgNo.1/redirect./qx/product.htm but am not sure if it will work yet. Especially, because it is for a 3" axle tube diameter.

Edit: I want weld on brakets, not bolt on.

which caddy calipers?
there is the large ones that are ~7" between mounting pins and the small ones that are ~5"
the large ones fit the brackets that are sold as 'large GM caliper'
measure your calipers and order the ones you need