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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2005 Posts: 1,002 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 1,002 | I've not been able to find a 41-46 steering box yet to replace the 39-40 box that's in my truck. I noticed JC has the worm shaft gear with the recirculating balls for sale. Do you know if the 39-40 box will accommodate the 41-46 worm shaft, without any other modifications? I read the boxes are the same, but want to check with you guys before shelling out the dough.
Thanks.
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I have rebuilt many of these boxes, and I see no way to accomplish that.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | I am just about to go thru this exercise.
I want the easier gearing of the '46 box.
1st thing I see is the mast is too long ....................
I did see some one has done this , but I cannot recall the forum he was on .
Still looking . | | | | | Joined: Jun 2005 Posts: 1,002 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 1,002 | Thanks for your help Dave.
Guess Dusty and I will still be looking for a 42-46 box.
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Feb 2000 Posts: 5,233 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,233 | A '41 gear box is the same design as the '42-'46, the recirculating ball diameter is different as well as the number of balls so not all parts interchange from '41 to the '42-'46. The recirculating ball assembly will not fit other year steering boxes.
The gear box itself is the same for all truck sizes except the COE, just the shaft length changes.
A good welder can shorten the shaft by removing a section, and I suppose a good machinist could cut a new threaded end.
I grafted a '37 end to a '41 gear box so I could use all '37 parts inside the cab. I cut and welded the two shafts.
One thing to look for on used boxes is the lower tapered bearing race on the worm shaft, it is not replaceable. If water gets in the gear box, it sets on the lower bearing. | | |
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