I need some help with an old Dodge truck.

Cope said
Any one got experience repairing these big wheel cylinders?

My customer can not afford me to make the parts.

I gotta think the 1947 DODGE heavy duty wheel cylinder is a very common use part.

?????

Have you checked Rock Auto? A lot of basic parts for these trucks had industrial uses, so parts are available. Otherwise, check with the folks at Vintage Power Wagon.