Drive shaft loop... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMC910 · 04-19-2012, 08:28 PM

How far from the u-joint are they required to be? Also if someone could post some pics of their setup and mounting position for a 73-87...

Thanks!

Marv D · 04-19-2012, 09:07 PM

Rule book says within 6" of the u-joint IIRC. You can bolt it to the cab floor, weld it to the cross member, make a new cross member,, it's not specific on 'how' or how much clearance. Just that it better be built to 100% contain the D/S if the u-jount should fail. And trust me,, if you've ever had it happen, you want it built for FUNCTION.
I saw a D/S come up through the floor of a 62 ET car and almost take the right arm off the driver. And it was a STOCK floor (obviously with the X-frame removed and sitting on a 2x3 double frame rail chassis) They just bolted a "U" to the floor thinking the steel floor would suffice as the top of the loop. The force of a driveshaft twisting into a pretzel and the gears backing up the twist... man it's some scary stuff when one gets loose.

69GMC910 · 04-19-2012, 10:14 PM

I bought a Lakewood universal unit so hopefully it'll hold up... If the driveshaft doesnt!! Thank you for your advice!
Posted via Mobile Device

04-19-2012, 08:28 PM	#1
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Drive shaft loop... How far from the u-joint are they required to be? Also if someone could post some pics of their setup and mounting position for a 73-87... Thanks! __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph

04-19-2012, 09:07 PM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: Drive shaft loop... Rule book says within 6" of the u-joint IIRC. You can bolt it to the cab floor, weld it to the cross member, make a new cross member,, it's not specific on 'how' or how much clearance. Just that it better be built to 100% contain the D/S if the u-jount should fail. And trust me,, if you've ever had it happen, you want it built for FUNCTION. I saw a D/S come up through the floor of a 62 ET car and almost take the right arm off the driver. And it was a STOCK floor (obviously with the X-frame removed and sitting on a 2x3 double frame rail chassis) They just bolted a "U" to the floor thinking the steel floor would suffice as the top of the loop. The force of a driveshaft twisting into a pretzel and the gears backing up the twist... man it's some scary stuff when one gets loose. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

04-19-2012, 10:14 PM	#3
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: Drive shaft loop... I bought a Lakewood universal unit so hopefully it'll hold up... If the driveshaft doesnt!! Thank you for your advice! Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph



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