A friend of mine has a 9-bolt drum rear with 3.45, and I have the crappy 2.77 disc rear. I want those gears!!!

Here are my Questions:

1) Is there a difference between a disc rear carrier and a drum carrier?

2) If I wanted to purchase is rear from him, what would I need to change to get it under my car with disc brakes.

3) If I did get the gears and carrier from him, what would I need to get to put them in my rear?? Install kit? What comes in them and do I need more?



Thanks guys.

 

I am by far an expert, but I would think you could at least take out the guts of one and put it in the other, you would more than likely have to adjust for lash and slop but it should fit.

I know for the 10 bolts its not really easy, but it might be on the 9 bolt to take off the brake stuff and put it on the other axel.

BTY, you should change your transmission gears to match, otherwise your speedo will be off.

John

 

Yeah, I'm thinking that they should interchange. I'm thinking that the only real difference is the backing plates for the calipers.

 

Thats the difference between the two for the 10 bolt, it would not surprise me either way... What always surprised me is how close they are, If I were GM I would have just made the bot haxels the same and work around it...

If your a good welder, you could weld up a new back plate...

John

 

I have read that the disk and drum rears had different lenght axles, but I dont think that is true. I have had a 3.08 drum rear, 2.77 older style disk rear, and a 3.45 older disk rear that I converted to pbr's. I think all you will need to do is change the backing plates and breaks. To do this there is 4 bolts at the end of each axle that hold the axles in. You have to unbolt them and pull the axles to change backing plates, but its not to hard(I did this converting the 3.45 rear to pbr brakes).

I think that if you change the intearnals from one to the other you will have to buy more parts and change more stuff. I would get new axle bearings and seals while you have the axles out of the rear to change the breaks though. You will have to have them pressed on though.

Ben

 

I think my bolt patterns on the brackets were different from my drum to disk tho... I know Baer sells a conversion kit

John

 

I dont think they should be. It is the bolts that hold the axle in that the backing plates bolt to. I doubt that they would make the housings different.

Ben

 

Here are pics of the 9- and 10-bolt PBR backing plates (the 9--bolts are for sale, by the way). Note the difference in bolt patterns.

JamesC

 

The 9-bolt is the old one, the 10-bolt the new.

JamesC

 

it even looks like the hub size is different, a little larger on the 9 bolt. Might explain why they are a different bolt pattern as they probably did not want someone to mix the two. I imageine if your backplate did not rest on the hub itself and fit snug it might have some strength issues. but thats asssuming that the pic is not an illusion...


John

 

Yes, I know that the 9 and 10 bolts have different backing plates. I meant that I think that a 9 bolt disk backing plate should fit fine on a 9 bolt drum housing.

Ben