FJ40 Power Steering Conversion - 80 Series Power Steering Box Kit? (2 Viewers)

[-MaTTi-]

@-MaTTi- that lock nut is doing much good, needs a longer bolt.

It´s not tightened properly yet in the picture.

 

[lelandEOD]

The

I have 60-series (late model) steering box, 70-series relay rod and Monroe SC2915 steering damper with SC2946 mountings. Those are cheap in Rockauto, so I bought both and mixed them to get right one. Just right length now without any modifications.
View attachment 2189142

Very cool post. I'm going to give this arrangement a try before I commit to changing the frame hanger. Too bad I need to buy another set of OME pins...

 

[lelandEOD]

@-MaTTi-

Did you reuse the factory shock towers when you added the new steering box?

 

[-MaTTi-]

@-MaTTi-

Did you reuse the factory shock towers when you added the new steering box?

I made the left one, here is some pictures of it: BJ42 going in half - project

 

[lelandEOD]

Ah, that explains it.
I see that you heavily modified that DS shock tower which enabled you to get the steering box another 50-60mm to the rear. That’s why you were able to get the damper to line up where I am not.
Thanks for the info!

 

[-MaTTi-]

I see that you heavily modified that DS shock tower

Yes, I cut one very much, almost got it fit properly, but not so good I wanted:

...so I made a completely new one of 2x5 mm + 8 mm plate:

 

[Blackknight1]

Does the 60 pitman arm fit the 80 series box ?

 

[cruisermatt]

Does the 60 pitman arm fit the 80 series box ?

Yes
The one I just did I had the box tilted a bit more forwards so the 80 arm actually worked out better, the 60 pitman arm put the drag link really close to the spring at full bump on driver’s side

80 box (and pitman arm):

 

[Blackknight1]

Sorry if this question was asked before. What is the advantage of the 80 box vs the 60's ?
How thick are the plates you used to reinforce the frame under the box ? Good job on yours by the way.i hope mine looks as good when done.

 

[Blackknight1]

yes, they do - same clearance on the shock tower, too - that's why Kevin was able to swap in the 80 box so easily after prepping for the 60 box

Do you think that the shock tower remained strong after being modified to clear the steering shaft

 

[cruisermatt]

Sorry if this question was asked before. What is the advantage of the 80 box vs the 60's ?
How thick are the plates you used to reinforce the frame under the box ? Good job on yours by the way.i hope mine looks as good when done.

80 power piston is 4mm larger diameter. This means more steering assist. In practice it is minimal difference and both boxes are very powerful on a FJ40 which is much lighter then a 60. Use whatever box you get your hands on.

Plate welded on the inside of frame is 3/16", frame sleeved with 1/2" ID tubing. Nothing thicker then the rest of the chassis, doesn't need to be.

Do you think that the shock tower remained strong after being modified to clear the steering shaft

People have been doing these for +25 years... it's fine

 

[Blackknight1]

80 power piston is 4mm larger diameter. This means more steering assist. In practice it is minimal difference and both boxes are very powerful on a FJ40 which is much lighter then a 60. Use whatever box you get your hands on.

Plate welded on the inside of frame is 3/16", frame sleeved with 1/2" ID tubing. Nothing thicker then the rest of the chassis, doesn't need to be.



People have been doing these for +25 years... it's fine

Thank you. I will proceed as you advise. Great info.

 

[Blackknight1]

80 power piston is 4mm larger diameter. This means more steering assist. In practice it is minimal difference and both boxes are very powerful on a FJ40 which is much lighter then a 60. Use whatever box you get your hands on.

Plate welded on the inside of frame is 3/16", frame sleeved with 1/2" ID tubing. Nothing thicker then the rest of the chassis, doesn't need to be.



People have been doing these for +25 years... it's fine

Did you also use 3/16 on the outside ?

 

[cruisermatt]

Did you also use 3/16 on the outside ?

No, 3/16" on the side and the holes in the frame are sleeved with 1/2" tubing. That prevents the frame from crushing. Plating the outside would require even more material removed from the shock mount.

 

[DSRTRDR]

Do you think that the shock tower remained strong after being modified to clear the steering shaft

what do you mean with "remained strong" ? - it was braced for additional strength over the OEM shock tower

also, nothing on my power steering conversion has broken in the past 7 years

 

[Blackknight1]

what do you mean with "remained strong" ? - it was braced for additional strength over the OEM shock tower

also, nothing on my power steering conversion has broken in the past 7 years

Good to know. Glad that I won't have to install the Ford shock towers . They're impossible to get here.

 

[subzali]

No, 3/16" on the side and the holes in the frame are sleeved with 1/2" tubing. That prevents the frame from crushing. Plating the outside would require even more material removed from the shock mount.

If you don’t use an outside plate you have to move or modify the radiator support right?

 

[cruisermatt]

If you don’t use an outside plate you have to move or modify the radiator support right?

Over 1” needs to be removed from the rad. support. So you would need at a minimum a 1” plate to avoid that, as well as a completely new shock mount.

 

[subzali]

Over 1” needs to be removed from the rad. support. So you would need at a minimum a 1” plate to avoid that, as well as a completely new shock mount.

When I did my FJ60 conversion I used a 1/4” plate on the outside of the frame to clear the radiator support and then used F250 shock towers. Is the 80 box bigger than a 60 so it interferes more with the radiator?

Brahma's Saginaw/FJ60 Power Steering Conversion

Great stuff Matt! Thanks for the pics on the threads... I can't wait until you get the drag link/relay rod in!!

risingsun4x4club.org

 

[cruisermatt]

When I did my FJ60 conversion I used a 1/4” plate on the outside of the frame to clear the radiator support and then used F250 shock towers. Is the 80 box bigger than a 60 so it interferes more with the radiator?

Brahma's Saginaw/FJ60 Power Steering Conversion

Great stuff Matt! Thanks for the pics on the threads... I can't wait until you get the drag link/relay rod in!!

risingsun4x4club.org

It's 4mm larger piston. the actual housing is pretty much the same dimensionally though.