bgott wrote:On our 67 we used this https://www.speedwaymotors.com/Speedway ... 36759.html
We run a closed knuckle 44 up front with a disc brake swap and a ford 9 in the back with a disc swap and it stops the truck nicely.
Minus drilling a few holes in the firewall and modifying the linkage for the pedal a bit it worked great for us.
IIRC the early J Trucks didn't have a booster and you'll definitely want that to be able to take advantage of the rear disks.
bgott wrote:^^^ What stuka said. It occurred to me that I didn't mention you will definitely want front disc running rear disc as well. Front drums and rear discs would be an odd setup and also 2x on the proportioning valve.
Here's an article about swapping the closed knuckle to discs. http://www.fourwheeler.com/how-to/trans ... /#photo-15
All the parts basically can be sources from similar era Chevy full size pickups. (Calipers, Backing Plate, Rotors, etc.)
bgott wrote:https://www.speedwaymotors.com/Under-Da ... 45467.html
That's the specific kit we used. We used the bracket it came with while the dash was out, but IIRC it would work with the stock assembly too with a bit of modification. The bracket it comes with has to be chopped to fit behind the dash and the pedal modified (bent) to go around the column. Nothing a smoke wrench can't fix, but a long days work if your dash isn't out.
Looks like BJ's is selling a kit to swap the front to disks now, and honestly for mild builds I think these front ends are plenty strong enough. I would upgrade if you have a ton of torque and/or wheel your rig hard, but for more or less stock application they're fine.
Here's the BJ's kit. http://www.bjsoffroad.com/1963-1973-Dis ... p_277.html
44bz wrote:There’s also a cast spacer that mounts between the booster brackets and firewall. It realigns the booster and master cylinder to match the power brake pedal. I got one from a 70 or 72 wagoneer I think.
I also used a hotrod style booster/mc/pv for a disc/drum configuration, similar to what was posted. I found mine on eBay. It bolted to the wagoneer firewall plate and lined up perfect with the jeep brake pedal.
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We used the underdash kit because it came with everything needed to make it work. I'm sure you could make the booster/MC from an XJ work, but you'll be piecemealing a system that I can't imagine would save you a tremendous amount of time/money and could cause you more headaches than it's worth.BWFDRUMS wrote:
Why did you guys go with an under dash kit. Do you think I can use a Master Cylinder and booster from an XJ?
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Im running an XJ master, vac boost, and disc/drum proportioning valve with drum front and rear and it stops my truck with 35s like it has disc up front. As long as theyre adjusted correct and in good working order it would work fine. Ive been running that setup for about 4 years now with zero issues. Youll have to drill a couple new holes for the booster (2 if i recall) but it is definitly doable and less expensive than a disc conversion. Ive driven interstate at 75mph and stopped it like any other vehicle would. Just make sure the fronts are evenly adjusted or youre gonna see some serious s**t at those speeds lol extremely hard braking locks it right up.BWFDRUMS wrote:bgott wrote:https://www.speedwaymotors.com/Under-Da ... 45467.html
That's the specific kit we used. We used the bracket it came with while the dash was out, but IIRC it would work with the stock assembly too with a bit of modification. The bracket it comes with has to be chopped to fit behind the dash and the pedal modified (bent) to go around the column. Nothing a smoke wrench can't fix, but a long days work if your dash isn't out.
Looks like BJ's is selling a kit to swap the front to disks now, and honestly for mild builds I think these front ends are plenty strong enough. I would upgrade if you have a ton of torque and/or wheel your rig hard, but for more or less stock application they're fine.
Here's the BJ's kit. http://www.bjsoffroad.com/1963-1973-Dis ... p_277.html
Why did you guys go with an under dash kit. Do you think I can use a Master Cylinder and booster from an XJ?
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Haha same here with the crazy mods. Thanks, I just actually pulled one off an XJ but wasn’t gonna trying swapping it until I find a new front axle with discs. I just bought an original MC and gonna try that so I can “kinda” drive until then. Thank you.Phils67 wrote:Im running an XJ master, vac boost, and disc/drum proportioning valve with drum front and rear and it stops my truck with 35s like it has disc up front. As long as theyre adjusted correct and in good working order it would work fine. Ive been running that setup for about 4 years now with zero issues. Youll have to drill a couple new holes for the booster (2 if i recall) but it is definitly doable and less expensive than a disc conversion. Ive driven interstate at 75mph and stopped it like any other vehicle would. Just make sure the fronts are evenly adjusted or youre gonna see some serious s**t at those speeds lol extremely hard braking locks it right up.BWFDRUMS wrote:bgott wrote:https://www.speedwaymotors.com/Under-Da ... 45467.html
That's the specific kit we used. We used the bracket it came with while the dash was out, but IIRC it would work with the stock assembly too with a bit of modification. The bracket it comes with has to be chopped to fit behind the dash and the pedal modified (bent) to go around the column. Nothing a smoke wrench can't fix, but a long days work if your dash isn't out.
Looks like BJ's is selling a kit to swap the front to disks now, and honestly for mild builds I think these front ends are plenty strong enough. I would upgrade if you have a ton of torque and/or wheel your rig hard, but for more or less stock application they're fine.
Here's the BJ's kit. http://www.bjsoffroad.com/1963-1973-Dis ... p_277.html
Why did you guys go with an under dash kit. Do you think I can use a Master Cylinder and booster from an XJ?
Sent from my iPhone using Tapatalk
Disclaimer: Any mods I have done to my jeep were done irrationally with a slight does of insanity and disregard for common sense. Perform at your own risk
All seriousnous though, it can be easily done and works fine.