I've read in a few threads that the booster from an 80 will fit into 70 series in general. Supposedly the connecting rod needs to be extended almost an inch (25mm). Are there any other mods? Any confirmation/information would be appreciated.
Thanks!
Bolts right up. Yeah an extension is required but is easy to do. You'll have to tweak the brake lines just a bit to refit them but thats it. Your Troopy will stop WAY better with that dual diaphragm. If it is a booster out of full disc truck you can tweak your LSPV to be a little more open as well.
Yes, I used a 80 series one in my 79. Direct bolt in but as you mentioned, the rod needs to be extended. Just make sure you get the 2 bolt one, otherwise you'll have to change the master too.
Good to know as I will be doing the same thing. I had to extend the rod on my BJ40 and used a coupler and a long bolt with head whacked off. I drilled a hole in the side of the coupler and filled it with weld so the two halves would come apart.
Yes, I used a 80 series one in my 79. Direct bolt in but as you mentioned, the rod needs to be extended. Just make sure you get the 2 bolt one, otherwise you'll have to change the master too.
Good to know as I will be doing the same thing. I had to extend the rod on my BJ40 and used a coupler and a long bolt with head whacked off. I drilled a hole in the side of the coupler and filled it with weld so the two halves would come apart.
The 80 series boosters come with studs for either a 2 bolt or 4 bolt master cylinder mount. So make sure you get the one that matches your master cylinder. The firewall side bolt pattern etc seems the same across most cruiser variants.
I made a longer clevis to adapt it up in my LJ71, works great, an absolute no-brainer of a mod if you're running big tyres &/or heavy loads.
Also guys if you use my method extending the shaft use some red lock tight to make sure it stays at the exact same length. I set mine up with verniers to make sure it was the same length.
Just did this upgrade, wow. Brake pedal feels way better and the truck stops much quicker. Extended the rod ~1" (25mm), using an old rod fitting, drilled it out, tapped it all the way through (M10x1.25), cut it to length (1"), then welded it to the 80 series pedal clevis.
Need to get a formed 80 series booster vacuum line as the 75 hose is too short to reach the new booster vacuum fitting. I had a section of straight line laying around, but a formed line would look better and not interfere with the master cylinder reservoir cap.
