Forum searches suck, so I'll just ask this question at grave risk of getting told to search before posting a question. Has anyone tried to install 80 series rear disk brakes on their 70 series rear FF axle. It looks quite do-able, with lots of up-side.
1.5" extra width per side.
Rear Disc Brakes. Yeah.
Rear axle parking brake that uses factory cables - double dog yeah!
I have an old and incomplete set of 80 series RDB's that I am experimenting with. Here's what I know so far.
The 80 hub has a wheel mounting flange some 1.5" outboard of the 70 series hub. The 80 hubs appear to bolt right on to the 70 FF spindles.
The second seal on the 80 axle is a bit different than the 70 series, due to the ABS ring on the 80 hub. Appears that it will work anyway.
The two hubs share the same bearings and spindle nuts.
The problem is that the axle flange on the 70 is quite different than the 80. Furthermore, the center hub that the backing plate has to go over is quite a bit bigger on the 70 than the 80.
At this time, it looks like I can cut a larger hole in the 80 backing plate, and drill out 3 new mounting holes (one appears to match up), and it will all bolt up. Access to the little hole in the back to adjust the parking brake drums will be lost, but everything else looks ok... mind you, I haven't test fit any of it yet. Besides, I don't have a complete set of 80 hubs. I have two backing plates, rotors, and callipres, but only one hub, and it's in a bad way as it's the one that precipitated the '3 axle break' at the base of Glacier 13, and helped coin the ACT2002 as the 'Camping Trip and Birfield Exchange', which somone has actually scribbed onto the side of Tippy... but I digress...
Anyone done this before, or knows of why it cannot be done, or should I take the next step, cut the center of the 80 backing plate and re-drill it for a test fit?
Peter Straub
BTW... this whole 'hub with a different wheel flange' completely destroys the concern that some people have about running wheel spaces or wider wheels "Aren't you worried about stress on the bearings with wider wheels?" Toyota 'widened' the stance on 4Runner IFS hubs and 80 series FF rear hubs without changing the bearings, or the location of thosee bearing on the spindle. HA!
1.5" extra width per side.
Rear Disc Brakes. Yeah.
Rear axle parking brake that uses factory cables - double dog yeah!
I have an old and incomplete set of 80 series RDB's that I am experimenting with. Here's what I know so far.
The 80 hub has a wheel mounting flange some 1.5" outboard of the 70 series hub. The 80 hubs appear to bolt right on to the 70 FF spindles.
The second seal on the 80 axle is a bit different than the 70 series, due to the ABS ring on the 80 hub. Appears that it will work anyway.
The two hubs share the same bearings and spindle nuts.
The problem is that the axle flange on the 70 is quite different than the 80. Furthermore, the center hub that the backing plate has to go over is quite a bit bigger on the 70 than the 80.
At this time, it looks like I can cut a larger hole in the 80 backing plate, and drill out 3 new mounting holes (one appears to match up), and it will all bolt up. Access to the little hole in the back to adjust the parking brake drums will be lost, but everything else looks ok... mind you, I haven't test fit any of it yet. Besides, I don't have a complete set of 80 hubs. I have two backing plates, rotors, and callipres, but only one hub, and it's in a bad way as it's the one that precipitated the '3 axle break' at the base of Glacier 13, and helped coin the ACT2002 as the 'Camping Trip and Birfield Exchange', which somone has actually scribbed onto the side of Tippy... but I digress...
Anyone done this before, or knows of why it cannot be done, or should I take the next step, cut the center of the 80 backing plate and re-drill it for a test fit?
Peter Straub
BTW... this whole 'hub with a different wheel flange' completely destroys the concern that some people have about running wheel spaces or wider wheels "Aren't you worried about stress on the bearings with wider wheels?" Toyota 'widened' the stance on 4Runner IFS hubs and 80 series FF rear hubs without changing the bearings, or the location of thosee bearing on the spindle. HA!
