Full Float Rear Axle Conversion - and FF mods

[ntsqd]

Not to counter myself, but there is some value in using common and/or familiar parts. It's just that they may force a compromise. So long as that compromise is known then it's personal preference. It's important to me that folks know the trade-offs that they're making. What they ultimately choose is their choice, even if I don't like it.

If we are talking a 60 that mostly sees trails and never really goes highway speeds, then the 60 front's in the rear could work fairly well. The slower the peak speed, the lower the dynamic weight transfer so the difference in front vs. rear piston areas can be smaller.

 

[ntsqd]

Has anyone looked into adapting 80 series rear discs to a 60 rear axle?

 

[Tinker]

I called the "weird part guru" at the Stealer today & he said he'd look for a caliper with smaller pistons but the same mount & throat as the 60/62. Then Jim The Yota Man who said "come down & look around for yourself" in his mini-truck yard (his ex-wife got all the Cruiser stuff in the divorce).

I already had the vented 60/62 rotors hogged out in the middle for the FF hubs so I don't want to go unvented just yet.

NT -
You've got a point about the 80 rear calipers. Maybe the Car Quest across the alley has one in stock. I'll try tomorrow.

 

[Spook50]

I
NT -
You've got a point about the 80 rear calipers. Maybe the Car Quest across the alley has one in stock. I'll try tomorrow.

I think he's referring to the entire rear disc setup. That might be worth investigating. A buddy of mine has an FZJ80 with rear locker (which I've been wanting to take a look at for comparison's sake) so I could take a look and see how the discs are set up on that (if I can ever get a hold of the guy).

 

[ntsqd]

Initially, yes I was thinking of the whole assembly, but shortly after posting (i.e. on my drive home) I got to thinking that perhaps the calipers alone would work well.

 

[Tinker]

Looks like the '93, '95, 97, & '07 Land Cruiser rear calipers are all single-piston, floating-frame type. Haven't been able to find out about the new 5.7 Tundras, though.

 

[Vicm]

I did my own FF rear convesion on a 40 rear SF axle few years ago. It was a lot of fun and a long thinking process. I am good with our local Mchine shop ,so they helped me out a little, but I did about 90% of it.
No e-brake issue with the 40 ,so I used all the stuff from 78 40 front axle.
I ended up welding front axle shafts together to test my conversion so I used seals from Universal sales and lockouts.
I drove it few months after that and the axles held up very good.
I even took it to trails for a good run.
I am going to get axle shafts made for it, to use the 80 locking diff, but right now , the 40 is all apart , having the body redone and getting a 3b Iinstalled this summer, if everything goes good.
Here is a pic from last summer.
The quality of the pics is not good, sorry about that.
Vic

 

[GulfShoresFJ60]

Initially, yes I was thinking of the whole assembly, but shortly after posting (i.e. on my drive home) I got to thinking that perhaps the calipers alone would work well.

I was thinking about putting the 80 outer ends on my 60 FF, but have not had the chance to track down any parts. From the EPC it appears pretty much everything would be replaced including the hubs. The part numbers didn't cross over between the two axles.

I don't have any experience with the 80-series e-brake, but would assume it would hold just as good as any other drum system. I'll probably hold off until I have problems with my current brakes.

 

[Spook50]

I was thinking about putting the 80 outer ends on my 60 FF, but have not had the chance to track down any parts. From the EPC it appears pretty much everything would be replaced including the hubs. The part numbers didn't cross over between the two axles.

I don't have any experience with the 80-series e-brake, but would assume it would hold just as good as any other drum system. I'll probably hold off until I have problems with my current brakes.

If it's anything like the setup on my dad's Heep, it has the discs with a kind of integral drum that's just for the ebrake. Not a bad design overall. I think that's te only part of that Heep that hasn't had issues yet...

 

[ntsqd]

It is a good design, Mercedes & Volvo have been using in the rotor hat type drum type p-brakes as far back as I can remember them having rear discs. Corvettes, Explorers, Ford F-Series, and the full size GM trucks also use this p-brake design.

The only domestically used hydro-mechanical caliper that I know of that works is a Varga, but I do not know what the application is. I've no experience or info with the Asian hydro-mechanicals. FROF used to (still does?) offer a Mini rear disc conversion using Supra hydro-mechanicals. I'm interested if anyone has experience in using those.

I'm hearing from a well respected vendor that the 80 series set of parts most likely are not a bolt-on and worse, probably would require grafting the 80 stubs to a 60 housing. No info on simply adapting the calipers & brackets to a 60.

 

[Vicm]

It is a good design, Mercedes & Volvo have been using in the rotor hat type drum type p-brakes as far back as I can remember them having rear discs. Corvettes, Explorers, Ford F-Series, and the full size GM trucks also use this p-brake design.

The only domestically used hydro-mechanical caliper that I know of that works is a Varga, but I do not know what the application is. I've no experience or info with the Asian hydro-mechanicals. FROF used to (still does?) offer a Mini rear disc conversion using Supra hydro-mechanicals. I'm interested if anyone has experience in using those.
I'm hearing from a well respected vendor that the 80 series set of parts most likely are not a bolt-on and worse, probably would require grafting the 80 stubs to a 60 housing. No info on simply adapting the calipers & brackets to a 60.

I think you mean FROR.
I did a rear disc brake conversion on an 89 Toyota pickup 2 summers ago. I was going to use the supra rear disc calipers that have built in levers for the e-brake. I was able to find a lot of info , but all the part store around my area were not able to get them ordered for me.
They would be from 79-81 supras with rear discs.
you would have to use rotors from 79-85 4x4 toy trucks for SF land cruise rear disc. They are floating calipers.
We recently bought an HJ60 which I would like to change to rear disc.
maybe this summer I will be able to locate those Supra calipers.
There are other calipers that work in the same maner.
89 Corolla with rear discs , I was able to locate them ,but the levers are offset , so still the supra calipers are better, because they have the levers in the right location.
For SF rear or FF this would be where I would look to do discs.
Making a caliper bracket should be easy to do.
All this info I got from looking at pics ,searching on the web and taking to the parts guys. So even though I can't confirm it, I think it is worth looking into.
I have posted about this few times on mud, but never got any feed back with more insight, just more questions.
You can talk to Brian at FROR , he might offer more info on the Supra calipers.
I had a chat with him a while back he was very helpfull with info.
Vic

 

[Kynot62]

I think you mean FROR.
I did a rear disc brake conversion on an 89 Toyota pickup 2 summers ago. I was going to use the supra rear disc calipers that have built in levers for the e-brake. I was able to find a lot of info , but all the part store around my area were not able to get them ordered for me.
They would be from 79-81 supras with rear discs.
you would have to use rotors from 79-85 4x4 toy trucks for SF land cruise rear disc. They are floating calipers.
We recently bought an HJ60 which I would like to change to rear disc.
maybe this summer I will be able to locate those Supra calipers.
There are other calipers that work in the same maner.
89 Corolla with rear discs , I was able to locate them ,but the levers are offset , so still the supra calipers are better, because they have the levers in the right location.
For SF rear or FF this would be where I would look to do discs.
Making a caliper bracket should be easy to do.
All this info I got from looking at pics ,searching on the web and taking to the parts guys. So even though I can't confirm it, I think it is worth looking into.
I have posted about this few times on mud, but never got any feed back with more insight, just more questions.
You can talk to Brian at FROR , he might offer more info on the Supra calipers.
I had a chat with him a while back he was very helpfull with info.
Vic

Don't create a brake/axle frankenstein on your 60/62. I put the FF from Specter on my 62 this summer. Basically a used FF housing with axles. Uses all the same brake parts (drum) as my SF. The drums work fine, and I pull a small trailer with brakes. By the way the drums and backing plates are the same, FF or SF axle. My third member bolted right in.
If you have a factory manual for your rig you may find that some of the drawings for the brakes will actually be full float axles. One other thing of note, the bearings in a full float are supposedly the same as the front axle....
SF 3rd member is the same as the FF 3rd in the front axle, only difference is the spacer on the pinion shaft for the semi float axle c-clips. This part is omitted on a FF. I only know they are the same because I swapped out my 4.11's for 4.88's and I found no differences.
Don't be shocked about the weight of your rig my 62 lightly loaded tips the scales at the dump at 5700 lbs not counting passengers and driver. FJ 80's I hear run close to 7000!

Best of Luck

 

[Tapage]

reading this thread drive me to the same couple of question that I place in this thread too ..

https://forum.ih8mud.com/hardcore-corner/255557-2nd-long-rear-broken.html