Manual to Power Steering Conversion

[70 Challenger Lover]

Now that my RT is going to be gone soon, I can start thinking about getting back to my other 70 Challenger. I thought I'd like the manual steering feel but driving the RT with manual steering just wasn't fun. I know now that I want to upgrade to power steering in this other Challenger that I plan to keep. I have time to plan this out while the car is still a shell. I am not fixated on keeping this car in pure stock form.

I do now that the steering shaft in my manual steering car is longer than a power steering one and if I recall, it's also a little bit larger diameter. I think I want to go with a Borgeson box and I found the Bergman adaptor so I can maintain the slip joint coupling.

Am I correct in assuming that I cannot use a manual steering column shaft for this conversion no matter what? Even if I cut it shorter, it seems the larger diameter would still stop me. I can try to find a power steering column shaft but those things have become stupid expensive. Like an idiot, I had several columns from power steering cars and sold them all off.

[Chryco Psycho]

As I recall the shaft size makes no difference , if they are different which I doubt as the cross pin & shoes slide into the coupler the same way , the coupler is what is different for the different spines on the steering box which you have solved .
As far as using the same shaft you can break the nylon pins & the shaft will slide together to shorten it , they are often already broken anyway .
I would advertize first for a power steering shaft , they are more common before damaging the manual shaft , all you need in the inner shaft not the whole column .

[70 Challenger Lover]

Ok, that makes sense on diameter but I do need to shorten it. I'll advertise as you suggest. I've seen other folks looking for them from time to time and they don't seem as plentiful as they once were. I am going to the Fall Fling in two weeks so I'll keep my eyes peeled for one there.

[RUNCHARGER]

The splined shaft on the PS and MB boxes are different, the steering column shaft size is the same.

[drew43a]

I change to power steering on my 70 cuda.  i found the coupler  on ebay for like $60.00 way cheaper then an aftermarket and i knocked the steering shaft together to make it shorter.
does anyone know if you can change the seal behind the pitman arm without removing the steering box from the car?

[70 Challenger Lover]

I change to power steering on my 70 cuda.  i found the coupler  on ebay for like $60.00 way cheaper then an aftermarket and i knocked the steering shaft together to make it shorter.
does anyone know if you can change the seal behind the pitman arm without removing the steering box from the car?

I did it once on a GM but not sure on a Mopar. I would guess it's possible though it won't be a fun job.