1969 3/4 4x4 front end disc brake conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chopperrob · 01-03-2004, 11:16 PM

I have a 1969 3/4 ton Longhorn pickup that I am converting to a 4x4. I have a 1969 3/4 suburban that will be the donor. How do I convert the front end from drum brakes to disc brakes.
thanks for the help

Rob

1969 GMC · 01-04-2004, 01:22 AM

hello and welcome to the board!

to convert the '69 front end to disc brakes, the easiest way is to get a complete dana 44 or 10 bolt front axle from a '71-up 4x4 with the same lug pattern. in '73 the axle tubes got larger, so you will need different u bolts. there are also some brake problems you will run into with this swap, but maybe someone else can help you out.

**Bernie** · 01-04-2004, 01:34 AM

I'm in process of doing this. I don't have the complete story, but what I have so far is this. 2 wd and 4X4 frames are different. It is better to get the later axles for open knuckle and disc brakes. Use a power brake booster and master cylinder from a 71 3/4 ton. 2 wd and 4wd boosters are the same. Master cylinders are the same for 71 and later. Need a proportioning valve from the later truck. All of this is for 3/4 ton. If I'm wrong, I hope people will correct me.

**JIMs70GMC** · 01-04-2004, 01:35 AM

Just make sure you get brake lines for the year of the axle you install.

01-03-2004, 11:16 PM	#1
chopperrob Registered User Join Date: Jan 2004 Location: Cincinnati, Ohio Posts: 1	1969 3/4 4x4 front end disc brake conversion I have a 1969 3/4 ton Longhorn pickup that I am converting to a 4x4. I have a 1969 3/4 suburban that will be the donor. How do I convert the front end from drum brakes to disc brakes. thanks for the help Rob

01-04-2004, 01:22 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	hello and welcome to the board! to convert the '69 front end to disc brakes, the easiest way is to get a complete dana 44 or 10 bolt front axle from a '71-up 4x4 with the same lug pattern. in '73 the axle tubes got larger, so you will need different u bolts. there are also some brake problems you will run into with this swap, but maybe someone else can help you out. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-04-2004, 01:34 AM	#3
Bernie Senior Member Join Date: Jan 2001 Location: Northern Illinois Posts: 516	I'm in process of doing this. I don't have the complete story, but what I have so far is this. 2 wd and 4X4 frames are different. It is better to get the later axles for open knuckle and disc brakes. Use a power brake booster and master cylinder from a 71 3/4 ton. 2 wd and 4wd boosters are the same. Master cylinders are the same for 71 and later. Need a proportioning valve from the later truck. All of this is for 3/4 ton. If I'm wrong, I hope people will correct me. __________________ Bernie

01-04-2004, 01:35 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Just make sure you get brake lines for the year of the axle you install. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



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