eddc
Tyre kicker
Posts: 1
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Post by eddc on Feb 23, 2017 11:25:35 GMT 12
Hello, With a new purchase I am looking at lowering a 73-87 square body Chevy c10. The aftermarket supports this truck very well but I would like to confirm that the traditional method of lowering the rear of the truck (leaf springs) by relocating the axle from underneath the leafs to above the leafs (and therefore supported on u-bolts) is certifiable? This configuration is in production on other trucks (hilux 2wd) and is a tried and tested modification to these trucks.
Second query is what certification issues will I hit when converting a long-bed fleet side pickup to a short-bed stepside. This will entail chassis shortening at the centre via cutting and welding with structural support (my main concern for the cert) and new panelling for the bed. The engineering challenges here are minor (having done similar in the past) but it concerns me that some of the cert issues will be insurmountable. Your assistance would be greatly appreciated. Edd
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Post by Leon on Feb 24, 2017 15:36:06 GMT 12
Hi Edd, sorry for the delay, I needed to consult an expert first. You can go to a leaf under setup. There were a few things to consider in doing so though. The pinion angle can become too much. Also watch for the angle the shocks get to, and potentially the shocks might be too long for the new axle position. Some kits don't supply a correctly fitting bracket to re-locate the axle. The end result being that they can end up working inside the bracket. The chassis shortening shouldn't be a problem, but before you get into that, please work with a 1C or 1D category certifier regarding how to design the reinforcement around the join, and also during what stage of that process your certifier wishes to see the vehicle. Certifier contact list www.lvvta.org.nz/contact.html#certifierChassis mods like that are covered in the NZ Car Construction manual, which can be purchased in physical copy from NZHRA, or electronically either as a complete publication, or by chapter online. www.lvvta.org.nz/documents.html#hctm
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