Suspension Jacking question
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Senior Member
Joined: May 2012
Posts: 582
Likes: 1
From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
Suspension Jacking question
Looking to -
Remove rear wheels, to get easy access
1)Install new panhard bar
2) install New lca's
3) install New rear sway bar bushings and end links
Now from what I have gathered is that the car's weight must be on the suspension... So the jack stands should be holding up the rear axle and NOT the frame... Correct?
Am I forgetting something? This seems like a pretty straight forward op.
Remove rear wheels, to get easy access
1)Install new panhard bar
2) install New lca's
3) install New rear sway bar bushings and end links
Now from what I have gathered is that the car's weight must be on the suspension... So the jack stands should be holding up the rear axle and NOT the frame... Correct?
Am I forgetting something? This seems like a pretty straight forward op.
Joined: Dec 1999
Posts: 5,964
Likes: 37
From: Hacienda Heights, CA
Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird
Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi
Transmission: WC-T5, WC-T5, 700R4
Axle/Gears: 3.45, 3.27, 3.27
Re: Suspension Jacking question
Looking to -
Remove rear wheels, to get easy access
1)Install new panhard bar
2) install New lca's
3) install New rear sway bar bushings and end links
Now from what I have gathered is that the car's weight must be on the suspension... So the jack stands should be holding up the rear axle and NOT the frame... Correct?
Am I forgetting something? This seems like a pretty straight forward op.
Remove rear wheels, to get easy access
1)Install new panhard bar
2) install New lca's
3) install New rear sway bar bushings and end links
Now from what I have gathered is that the car's weight must be on the suspension... So the jack stands should be holding up the rear axle and NOT the frame... Correct?
Am I forgetting something? This seems like a pretty straight forward op.
Lon
Joined: Sep 2005
Posts: 27,819
Likes: 2,406
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Suspension Jacking question
that the car's weight must be on the suspension
Lon's method is a good one; pretty much minimum effort. I'd suggest driving the rear up ont the ramps, jacking the pumpkin to lift the tires off the ramps, removing them and the ramps, and supporting the "frame" just in front of the LCA attach point with one pair of stands; then lowering the pumpkin until it hangs free (shocks fully extended), then jacking it back up a couple of inches to lift it off the shocks; then supporting the AXLE TUBES - not the pumpkin, not any of the brackets, not ANY OTHER PART besides THE AXLE TUBES - with another pr of stands. In that configuration, there is minimum force on everything.
I'd also suggest that once you get the car to that point, you've done 90% of the work of changing out the rear springs, and 80% of the work changing out the shocks; go ahead and do the other 10% and 20% respectively.
Do the LCAs one at a time; i.e. remove one, re-install; go to the other side, R&R. Don't take em both loose at the same time, that'll risk making extra work for yourself in getting everything lined back up.
And forget about the "suspension loaded" myth, for this job.
Re: Suspension Jacking question
Well, it actually isn't an old wives tale. haha The suspension should be loaded to prevent bushing clocking.
Bushing clocking is a preload in the suspension that essentially increases roll rate/spring rate by building a level of resistance into the part at the point they were installed. Suspension can travel as much as 19-inches. If you install a part torqed down 19-inches away from the operating zone, it can result in a discrepancy in ride height because of the resistance. This is extremely crucial on front A-arms, rear control arms, and sway bar end links.
- Kevin
Bushing clocking is a preload in the suspension that essentially increases roll rate/spring rate by building a level of resistance into the part at the point they were installed. Suspension can travel as much as 19-inches. If you install a part torqed down 19-inches away from the operating zone, it can result in a discrepancy in ride height because of the resistance. This is extremely crucial on front A-arms, rear control arms, and sway bar end links.
- Kevin
Joined: Oct 2001
Posts: 12,211
Likes: 1,135
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Suspension Jacking question
If the bushings are lubed properly, why would there be binding or clocking?
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