Two questions
 

First question: I think I have the ho52. I did research and find that the differences between the ho52 and ho72 are the same (mostly) except for the brakes. Ok since the 52 is rated 5200 lbs and the 72 at 7200 lbs would the HD spring upgrade change the axle since it increases the capacity to 7200 lbs as the tag on the door jamb says? I haven't measured the drums yet to find out but I would think that would be called out on the SPID.

Question two: if I get the app for this site does it fix the iPhone picture upload capability?
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Re: Two questions
 

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I don't think it would change the axle. The HO72's were used in 1 ton trucks. Best gear you are going to find for one is 4.10. Don't know if this will help or not.

http://67-72chevytrucks.com/vboard/s...d.php?t=536119

Maybe you already seen it.

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