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04-11-2007, 06:45 PM
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Subframe Bushing torque for '79 Firebird Formula?
I just changed my car's subframe and radiator support bushings with Urethane units. I've torqued them all to 40 ft/lbs, but am unsure if that is too loose/tight.
My GM Body manual makes no mention of this, nor can I find any published specifications on the web. Any suggestions are appreciated! Kevin-Chandler, AZ 
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04-11-2007, 10:11 PM
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Remember how tight they were coming out? Those big old bolts need way more than 40lbft to be tight. I don't remember the exact figure, but when I did the centers & rears on my '72 Nova, I think the spec was over 100lbft.
I just checked Energy Suspension's site, and they said they supply 5/8"x11 Grade 5 bolts in their kits, and the torque chart I have says that size requires 110lbft oiled, or 150lbft dry. I oiled mine good so maybe they won't be such a hassle next time. torque chart: http://www.raskcycle.com/techtip/webdoc14.html Last edited by jimfulco; 04-11-2007 at 10:29 PM.
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04-12-2007, 05:26 PM
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Thanks for the information!
I figured they were so tight due to all the corrosion and electrolysis between the parts. The original shells fell apart and even the bolts had huge pits in them. My replacements came with new shells, bolts, washers, so I'm glad I spent the extra $$ to get them. My car has always been in dry-sunny AZ... can't even imagine how bad a car driven in road salt would be! Thanks again! KC
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04-16-2007, 11:54 PM
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Yeah, I don't think they ever intended you to actually remove them, just trade the whole car in on a new one. I hosed mine down with used motor oil about a week before I took them out, and only one required a little help from Mr. Ingersoll, but then we don't see much salt around here, just dirty water.
Rides like a whole nother car, doesn't it? 
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04-17-2007, 08:25 AM
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It absolutely rides like another car!
It actually has some road feel again, plus it doesn't flex when going over bumps! Before changing, it felt like there was a hinge at the bottom of the windshield that allowed the whole front end to move up/down and L/R !!! A really amazing difference for minimal cost and time! Thanks again for your advice! Kevin
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04-17-2007, 09:53 AM
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I've got a '79 Trans Am and I've got the FSM. I'll try to remember to look it up tonight when I get home from work.
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04-17-2007, 04:12 PM
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That would be great!
I have the '79 Body Manual, but it has no spec's for the subframe or radiator support bushings... Thanks!
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04-17-2007, 04:54 PM
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Radiator support bushings are 35 ft-lbs (nut on the bottom), the other 4 body mount bolts are 85 ft-lbs.
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04-17-2007, 06:43 PM
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Got it!!!
Thanks so much!
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