drum brakes and moser axles

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toshoo7

toshoo7

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ive recently changed from sbp to bbp with a set of moser axles and are now getting at the brakes.i plan on using 10 in back plates that are on the rearend now cause they were new last spring,does anyone know what drums i need to order to make this work.width doesnt matter (2 or 1 3/4)some brakes is better than none thanks .....jamie
 
it depends on what the axles are set up for...

are the axles for a or b body brakes?

and yes each backing plate has a different offset so you need the correct drum and hardware for the backing plate...
 
If the backing plates you currently have are SBP 10 x 1.75" plates, you have to replace them. You need to get backing plates that are designed for whichever BBP drum you wish to run.

Which axles did you purchase? SBP axle standoff with BBP or BBP axles with BBP standoff.
 
i bought the MEIA30-CST-A45,when i went in to order them i told them what had and what i wanted (not from moser but a local shop)they told me id need new drums but nobody mentioned the plates.those axles were the a bastard to get in,they were really tight
 
i just checked the moser site and it says *a body drums redrilled to 4 1/2 bolt pattern! they dont mention anything else,
 
805moparkid said:
it depends on what the axles are set up for...

are the axles for a or b body brakes?

and yes each backing plate has a different offset so you need the correct drum and hardware for the backing plate...
Click to expand...
oh crap, that wasnt what i wanted to hear but what do you do?
 
The 1 3/4" drums have a small "register" that the drums center on. It's the round, raised area in the middle. As mentioned, the 1 3/4" drum/backing plate assembly has a particular offset, which works with the axle bearing position that is unique to small bolt pattern A-body 8 3/4" axles. 2x10 backing plates and drums won't work if the axle bearing location is cut for the original, smaller brake assemblies. So it sounds like you have to use the smaller brakes and redrill the OEM drums for 4.5". Not sure how easy it is to find new drums when needed.
 
Locomotion said:
The 1 3/4" drums have a small "register" that the drums center on. It's the round, raised area in the middle. As mentioned, the 1 3/4" drum/backing plate assembly has a particular offset, which works with the axle bearing position that is unique to small bolt pattern A-body 8 3/4" axles. 2x10 backing plates and drums won't work if the axle bearing location is cut for the original, smaller brake assemblies. So it sounds like you have to use the smaller brakes and redrill the OEM drums for 4.5". Not sure how easy it is to find new drums when needed.
Click to expand...
you would think they'd mention this,:disgust: i cant be the first person to come across this problem
 
They probably just figure people know the ins & outs of what they are doing when they walk into a project like this. Just get the ones you have drilled for the new pattern. You might have 1/2" bolts on the new axles, so take that into account. New drums are still available. Somebody posted a part number for chubsgts yesterday or today. Search for posts by him & you should be able to find it.
 
'64 Cuda said:
They probably just figure people know the ins & outs of what they are doing when they walk into a project like this. Just get the ones you have drilled for the new pattern. You might have 1/2" bolts on the new axles, so take that into account. New drums are still available. Somebody posted a part number for chubsgts yesterday or today. Search for posts by him & you should be able to find it.
Click to expand...
i ll do that now,i just went out to look at something and noticed that center of the moser axles is larger than the center hole of the drum
 
I just looked at their web site & they don't mention anything about the diameter of the center register of the axles. The SBP drums have a 2.25" (IIRC) register. They should mention it if you need to machine the drum register to a larger size, but what they REALLY should do is supply the axles with the proper register for the drums.
 
Go to the salvage yard, and get a set of backing plates, and hardware off a B or C body, preferably 10" but you will probably get 11". Then go to the parts store and get new drums, shoes, and hardware to match the donor car you got the backing plates off of. Option 2 is to buy a set of backing plates on Ebay for an 8 3/4. Backing plates and hardware off an 8 1/4 axle will work also, I did my conversion using all 8 1/4 backing plates, and drums off a duster.
 
toshoo7 said:
oh crap, that wasnt what i wanted to hear but what do you do?
Click to expand...

If these are just stock replacement axles for a body with 4 1/2" bolt pattern then your only option is re drilling stock drum's to 4 1/2", if so disregard my earlier comment.
 
3forty said:
Measure the registers and then post what you have!
Click to expand...

I agree, if your stock drums register doesn't fit over the new axles, you may have the B or C body style. I would also call Moser and ask them what style you have, and what drum's you need to use. When I looked on there website, it does specify what type of drums to use with each axle. There was one that specifically say's Must redrill stock drum's!
 
its very easy... if the new axles are a body just redrilled or same housing to flange width as a stock axle then you need to redrill the drums...

thats why im going thru doctordiff and getting BBP a body axles set up for b body drums...
 
It says it right in the item description what you need.
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Part # A30-CST-A45 - A-Body, 8 3/4" Rear Axle Shafts, Stock A-Body Drum Brake (Redrilled) -- 30 Spline
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You need to use the stock A body drum and drill, or open the holes to 4.5" pattern.

If you have the small bolt backing plates and drum, you got what you need.
 
But the OP says the register on the axles is larger than the register on the drums. From the description on the Moser site it sounds like the axles are for stock A body drums that have been drilled for the LBP. So it looks like he has to not only drill for the LBP but he also has to machine the register in the drums to the larger axle register.

An alternative might be to machine the register to fit the drums. This would probably void any warranty the axles would have but it might be worth checking with Moser to ask them about it.
 
gunny+highway.jpg


It's a clusterf*ck at this point.

:)

I wonder if he got BBP standoff axles.
 
crackedback said:
gunny+highway.jpg


It's a clusterf*ck at this point.

:)

I wonder if he got BBP standoff axles.
Click to expand...

I agree about the cluster..........

As far as what axles he got...It would be nice if Moser would post the specs on their site. If they said what the register size is it would (maybe) help clear things up. Probably best to call them on Monday & find out for sure what's going on.
 
the end of the axles where the drum sits is 2 3/4 in,and the center of the drum is 2 1/4.I guess when they call them replacement axles they mean replace everything.lol this is getting so annoying its startin to be funny
 
I ordered a set of these last week. Should be here on tuesday.

Part # M30-CST-A45 - A-Body, 8 3/4" Rear OEM Axle Shafts, Stock A-Body Drum Brake (Redrilled) -- 30 Spline
SKU: M30-CST-A45

Availability: In stock.

Dont know if the original poster ordered online or called. But I called when I ordered mine and they asked plenty of questions about my application, including wheather I wanted the A-body offset or something else. I told them I wanted to use my original A-body brakes and just redrill the drums. They said OK.

We'll see what mine look like when they show up this week.
I hope I dont have the same issue with the center register being a different size. Dont really want to spend a bunch of money on machine work. I'm running out of cash fast.
 
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