Technical 47-55 GM dropped axle question

Howdy All
I am interested in ordering a ‘47-55 3”drop GM truck axle for my ‘29 Chevy LQ. According to the specs, width, spring spacing, everything is correct. Are all GM spindles the same for those years? I see plenty of ads for spindles/disc brake conversions that use GM car spindles from those years ( which is what im wanting to do)… will the car spindles fit the truck straight axle? I dont see any ‘47-55 “truck” spindles advertised or even attainable.
Thanks
Jim

 

My dropped axle had 53/54 5 lug car drums on it when I got it

 

The '49-'54 car drums fit right on '55-'59 Chevy truck axle spindles and backing plates with no changes. But if I recall correctly those 5 lug car drums need a bearing spacer to work with earlier '47-'54 Chevy truck axles to work.

 

Thanks!

 

The dropped axle I’m using has 55-59 spindles in it.
Forgot that part

 

Kingpin bore size go from '29-'40, then '41-'59

 

Chevy Dropped Axles | Dropped Axles

here is everything you wanted to know about the axles and spindles etc......

 

Thank you all.

 

I'm not up on the later stuff as I've only done the 5 lug swaps on 48 54 axles. I did figure out that my 48 came to me with a pre 1941 axle under it as the surface for the inner bearing on the spindle is a smaller diameter and they change
I'm not finding the wheel bearing specs in the GM Heritage center archive vehicle info kits as I do for AD trucks Neither for 54 car or 56 truck.

When I have swapped car backing plates to truck spindles I have had to drill two new holes to bolt the backing plate to the spindle as the top to bottom spacing on cars is different than on trucks. That and you have to make spacers to fill the gap and buy new bolts.

Some say that you can just swap the 5 lug hub and drum to the 55.2 / 59 spindle and use the 3100 backing plates but I have never been an actual witness to that and have not done it myself.