I've not found any differences between the 50 and 52 frames. The 47-53 frame is NOT interchangeable with the 54 though. The 47-53 frame rises more over the rear axle. This is because the 54 frame uses the new lower flat rail bed. There are other minor differences also.


"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.

Robert
55.1 GMC 450 COE
51ish GMC Suburban