Technical Steering box issues

I'm looking for a little help on the steering box placement on my 1940 chevy hotrod pickup. The box I took off was an old saginaw that was wider and mounted on a 2x2 box tube welded to frame. It was worn out and a lot of play in steering. I bought a reversed Corvair box and it's a bit different dimensions to say the least. I will be buying new steering column, drag link, pitman arm. I plan to have a mounting plate made up and welded to top of frame rail. The problem is as seen in photos, clearance to wishbones from pitman arm and angle of hole/steering column through firewall. Will 2 DD u-joints work to connect from column with a short section of Double D shaft? And can I heat a pitman arm and bend to clear wishbones? I have the lake style header off and I don't see any clearance issues with it. Any advise is appreciated, Thank You.

 

I’d look for a smaller Vega box for that setup.
The one you picked looks awfully wide.
Sorry I don’t have any measurements for comparison.

 

You can heat and bend a forged pitman arm, but not a cast one. What kind do you have?

 

2 joints would work so long as you avoid binding. IIRC they are good to 30-35 degrees of angle.

 

Corvair box is awfully " light duty" for a '40 ...

 

The pitman arm I bought is forged.

 

The truck is light weight with a new straight axle 4" drop, fenderless with a 283 sbc engine. I was hoping this box would be strong enough, the plan is to have a local weld shop fab a mounting bracket and weld to frame. I just need to get everything mocked up for alignment first. Thank you for the replies.

 

lots of good info here
https://www.jalopyjournal.com/forum/threads/cowl-steering-just-stop.1101046/page-2

 

Wishbones on a 40 Chev truck?

 

" hoping " its strong enough ???

 

A corvair should weigh around 2500 pounds.
a complete 40 Chevy truck should be around 3500
I guess engine placement between a corvair and truck would be a consideration.
A bobber truck would probably be ok
Doubt it will be hauling loads and fire wood or coal

 

I got some more mock up done with the steering box. Someone before me kinda butchered a few things on this truck, but I'm working on correcting what I can. Plan is to move the hole in firewall over a little to better align and probably have a mount made to raise the box up about 1 1/2", a short section of double D shaft with 2 u-joints connecting to steering column. Does anyone have any suggestions with this method? Thank you.

 

I’m confused.
The pitman arm location on that box is beside the frame instead of the engine.
Are you running your drag link parallel and outside the frame …

 

This is a traditional side steer with reversed corvair box, not cross steer.

 

Can you use a mount plate that moves the box out the where the u joint is straight?

 

At least make a wedge mount and tilt the Worm gear up so it's pointed towards the hole in the floor.