69 SWB Drop and Disc Conv Questions
 

I just got this truck and I'm getting ready to drop the front and rear and convert the front brakes to discs. I have two questions for y'all before I start ordering parts.

1. How far can I lower it before I have to consider c-notching the frame? I was considering a 2 1/2, 4 or a 3 1/2, 6 inch drop.

2. Will the wheels that are currently on it still fit after the disc brake conversion? They are six lug rallys with center caps that say 4x4. I don't know if the 4x4 cap means they are 4x4 wheels or if its just a different cap. The truck is not a 4x4.

Ok, I lied, Three questions...

3. The truck currently has power brakes. Will the master cylinder and booster thats on it work with the disc brakes?

There will be many more, I'm sure, over the course of this project. Thanks in advance for any help.

Re: 69 SWB Drop and Disc Conv Questions
 

1) 4" will put you pretty close to the frame but you should be ok. use an aftermarket "button" style snubber.

2) wheels should fit fine.

3) you will need to add some type of proportioning valve either stock or aftermarket because the discs require a lower line pressure to operate.

Josh

Re: 69 SWB Drop and Disc Conv Questions
 

Thanks for the info!

Do you know if these wheels were 4x4 specific or are they just different center caps?

Re: 69 SWB Drop and Disc Conv Questions
 

the rims on your truck were factory rally rim on the 73-87 4x4 trucks hence the 6 bolt pattern, 2wd were the 5 bolt pattern. and as far as the disk conversion there is a post of using??88 up?? 3/4 ton components that have the same 6 bolt pattern as our trucks

Re: 69 SWB Drop and Disc Conv Questions
 

Not wanting to hijack but my wheels look pretty much the same and i wonder if they are the same. i want to do the disc conversion but I'd like to keep the rims and i want to know how I can find out for sure if they will clear discs. Is there a way to be sure?
http://i6.photobucket.com/albums/y23...G_3151copy.jpg

-Andy

Re: 69 SWB Drop and Disc Conv Questions
 

I had those same wheels on my '69 and they were great.

Sitting on bags:
http://i134.photobucket.com/albums/q.../snowdump2.jpg

<edit> mine cleared the McGaughy's 5 lug brake kit. If they are off the 4x4, they will clear.

http://gmcpauls.com/pictures/discbra...ceinwheels.jpg

Re: 69 SWB Drop and Disc Conv Questions
 

Great diagram. Thanks jd.
I'll have a look when i get home later.

-A

Re: 69 SWB Drop and Disc Conv Questions
 

A lot of ppl on this board swear up and down that u can get away w/a 6" rear drop w/out going to a C-notch. Others say you can't. I don't have any personal experience w/that. But, I tend to believe u can as long as you aren't driving 80 down a pothole-riddled dirt road.

I will add that when going to a 6" drop, a shock relocator kit would definitely help keep the axle off of the frame, along w/shorter bump stops as mentioned before. Many would recommend an adjustable panhard bar too, to keep the rearend centered w/that much of a drop.

Re: 69 SWB Drop and Disc Conv Questions
 

Thanks for all the tips guys. Good Stuff, I love this place!