1942 Chevy Power Master Cylinder

[docrock100]

I am building a 42 Chevy truck with stock suspension and frame, sbc 700r4, disc brakes, and drums on 55 rear axle. I want the master cylinder under the floor with a 7 inch booster. I could make something but have always tried to use kits for unstock performance upgrades. Just in case I sell it I don't have to worry about someone dying in my build. I looked on line and the 47-54 kits are a good buy but what is the frame difference between 46 and 47 where the kit mounts? Thanks for any help

 

[Dr Crankenstein]

1947 was a transition year for Chevrolet. Trucks produced early in the year were AK series ('41-'47). Trucks produced later in the year were AD series ('47-'54).

The AK frame...

and the AD frame...

Images plucked from http://chevy.oldcarmanualproject.com/ (I recommend this site to any Chevy guy.)

Anyhow, I don't know the details, but there is definitely a difference and I'd fully expect the '47-'54 kit would require some adaptation.

.

 

[docrock100]

Thanks for the info. I think the important measurement is the inside frame dimension, which mine is 5 7/16, and the frame width, mine is 2 inches. If anyone has a 47 -54 and it measures the same that would be great info.

 

[docrock100]

I ordered the 47-54 part and will update on how it worked or didn't work

 

[docrock100]

Looks like this kit will not work. The cross member for the trans is in the way. The brake arm hits the column. So, it seems I have parts to try to make something. I have been looking on line and actually have not seen a pedal assembly for this truck for the conversion. The original pedals would have attached to the trans if I remember right

 

[docrock100]

It works

After a little effort I got it to work. I had to mount it lower and remove the cross member. I bought an aftermarket trans cross member for the AD and it fit perfect. I am driving the truck now and have no issues with the brakes

 

[Old Iron]

WOW, a year later???
That's what I call sticktoittiveness.
Glad you got it to work out!!!!!!!!!!!!!!!!!!!!!

 

[MercuryMac]

That's what hotrod builders do, they make it work. Congratulations on jumping that hurdle.