View Full Version : Steering Finally have the Astro Box conversion finishied ???

06-05-2014, 11:29 PM
Putting the Astro Power Steering box in the speedster has been an adventure.

I think I finally have it done... Astro Box, IROC pitman, link made from '62 Camaro tie rod end, '55 Chevy tie rod end and '62 Camaro tie rod adjustment sleeve. Mounted it on a piece of 6" x 6" angle iron and an Astro column.

Put that PS box in and out at least a hundred times trying to get the angle and position right. The bracket looks like Swiss Cheese with all the attempted locations and angles. The IROC pitman was a solution to get ample turning radius on the Stude. The original PItman was about 8" and the IROC is about 7" with 2" of offset, but the Astro box has a longer throw making the length of arc about right. Other Saginaw Pitmans are in the 5.75" range. It appears that on the IROC they used a longer Pitman with shorter internal stops to achieve faster steering than other GM products.

The IROC was the 4th Pitman I tried and I ended up building 3 drag links to get the right length, pivot and taper on the knuckles. I did have to settle for an inch of column offset toward the driver door at the firewall that I don't like.

06-06-2014, 12:33 AM
OK, I give up. Where do you find '62 camero parts?

06-06-2014, 03:25 AM
That will prove to be even more difficult than finding '62 Camaro parts!



OK, I give up. Where do you find '62 camero parts?

06-06-2014, 08:58 AM
You got me on '62.['82].. a '62 Camaro would be almost easier than finding the IROC pitman or the '55 Chevy tie rod end.... Found the IROC at pull and save and the '55 Chevy tie rod end from Danchuk. Needed the taper of the '55 to fit the bell crank and the taper of the later tie rod end to fit the Pitman. Shorter pitmans would have required the length of a football field to turn a corner.

Next project finding a better fit PS pump.

06-06-2014, 10:53 AM
Speedway motors has all the classic Chev. parts you need. The tie rod ends too. For pumps, go to their Circle Track catalogue. Might have to make your own brackets, but that is a piece of cake. Can't have Tom killing little kittens and blaming it on God.

06-06-2014, 12:06 PM
For the record, the first year of the IROC was 1985, so you will need to narrow down what pitman
arm you actually used if someone else will want to copy this install.


06-14-2014, 08:40 AM
Do you have any pictures?

06-15-2014, 08:41 AM
Some Pics...
Length/offset of IROC pitman and longer arc of Astro Box offset longer original pitman and shorter arc of original box.


06-15-2014, 06:15 PM
Thank you for the pictures, gives me a better idea of what I need to do.

06-15-2014, 10:07 PM
Started with 6" angle iron for bracket, '85 Astro column and box, IROC Pitman, single universal join and a drag link made of '55 Chevy Tie rod end, Camaro tie rod end and coupler (welded one tie rod end into coupler.

The fire wall opening was cut slightly lower. An H bracket was made from all-rod and strip of 20ga to allow for new angle on steering column. Steering column had to be offset about 1 1/2". Clearance between pitman and manifold is minimal. Did not need to modify column length.