I don't know about current 5 ton trucks but the M923 series still had left hand threads in the 90's I had a truck mounted machine shop (5 ton M944A1 chassis) made in late 80's-early 90's with left hand threads on lug nuts. Can not be totally useless and outdated idea, because even in 2011 it is still used in some single seater racing formulas, including F1. I've been working on Russian made trucks, made in the 70's and 80's and the wheel nuts still had left hand threads. It is used to keep the nuts from getting loose because of the gyroscopic effect. Thanks Wes! The odd thing with my M38 is that the left handed threads are on my front right and left rear.who knows how that happened. So if you are rebuilding the brakes or axles it is a good time to make the switch.Ĥ5 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100 The Willys wheel is designed for taper lug nuts and they use taper lug nuts so they do not really have to have left hand threads on the left side. We old timers whose first cars were 1950 models or older know better to check lugs closely for left or right on cars older than 1960. Hence from 1900 to the mid 50's most cars and trucks used left hand nuts on the left side of the car/truck. So with no positive locking it was possible for a right hand nut if not torqued correctly to back off and unscrew itself from the rotating direction of the left wheels. When the auto first came into our lives at the turn of the 19/20th century the wheel nuts for both axle and wheel lugs were not locking type nor did they employ the modern two different contact angles that wheel lugs started using in the 50's.
Also since I will be taking the hubs off for an axle service is there any reason, other than originality, not to change them over to right handed thread? Thanks
Posted: Sat 9:54 am Post subject: purpose of left handed threadĬan someone explain the purpose of the left handed thread on the jeep wheel lug nuts? No other car that I know of has this but there must have been a reason. :: View topic - purpose of left handed thread Forum FAQ Search Usergroups Profile Log in to check your private messages Log in USED AND NOS DOUGLAS AND PACKARD ELECTRICAL CONNECTOR PARTS Willys M Jeeps Forums-viewtopic-purpose of left handed threadĭon't have an account yet? You can create one here.
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