I just bought a 1978 32 foot Executive Motorhome and the VIN # shows that it is on a Dodge M600 chassis. I found a website that say's to check the wheel lugs, if it has 8 lugs it is a M600 chassis, if it has 6 lugs it is a M400 chassis, and if it has 5 lugs it is a M500 chassis.
I have 6 lugs and by the information I have found, it would be an M400 chassis.
The VIN# indicates that my RV is an M600, the lugs information tell me otherwise.
How can I tell for sure what I have exactly? Is it an M600 or an M400?
I am completely lost with this beast, HELP!!!
You definitely have an M600. The wheels on an M600 are 6 stud, M500 are 5 stud and M300 and M400 are 8 stud. Get yourself a Dodge Motorhome Chassis Service manual. The best resource for information. (I got this info from page 22-9) of the 1976 manual). In fact, pdf copies are available right here!! Rick
Also for that year
M300/M400 = 17.5" tires
M500/M600 - 19.5" tires
Definitely M600. I have one. Taking about wheels and lugs, be advised that the lugs on the drivers side are reverse threaded.
Interesting thread, I am trying to make a '35 Ford 1-1/2 ton into a driver at least and found out that the M500's are the ones that have 5 lugs with the 8" BC, same as my truck. I just got the spare of a rig at the local wrecker and it says 17" rather than the aforementioned 17.5" Just got one for a trial fit guess its a widowmaker, were the 17.5's and 19.5 both solid rims?
Thx!
Bob
19.5 solid. 17.5, depends on what year. Pre-74 were split. 74 and later, one piece (Budd rim).