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Old 06-19-2018, 09:22 PM   #8
lowrollin70gmc
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Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
Re: SWB 6-lug axle vs LWB 5-lug axle

The axles may be the same width if the axle is a late 1970. In 70, there were 2 widths of axles:

Early: 62 3/8” WMS, same as 67-69
Late: 63 3/4” WMS, same as 71-up

It would help to put a tape measure on the axle in the SWB before ordering parts, as there is a small chance that your 5 lug axles will fit if it’s the late 1970 axle.
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84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck"
70 GMC C1500 LWB My first truck: shaved, bagged, and more: the lowrollin70gmc
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