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Posted by Rorry on Wednesday, February 27, 2008 at 21:10:08 :
In Reply to: w100 or w150 posted by dave fraley on Tuesday, February 26, 2008 at 10:56:47 :
If your truck is a full-time it is a W100.If it has lock-outs,which didnt start till late 79,early 80 then its a W150.The 9 1/4 was used from around 74-up.The difference is the 4-1/2 0r 5" wheel bolt pattern.All pre 74 PWs were 100s,but they had the 5 1/2 bolt pattern also.Most rear axles on those were the 8 3/4s.All were equiped with 44 fronts.Im not positive on the spring differences,but have yet to see a difference.I am sure the 78 you have should be classified as a W100.It should have a 203 transfercase and the small 4 1/2 bolt pattern wheels and should be a full-time 4x4.
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