Rear Lower Control Arms
#2
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Ok I'll take a shot at this.
YES. You won't have to remove the differential, drive shafts, or half shafts. But you will have to release tension and remove the springs and lower shock bolts to let the control arms free. You can do this by removing the lower sub-frame plate attached to the bottom of the diff (lowering it on a jack). Spring compressors can be used as an alternative method, but it is not required to use them; just good judgement and procedures to release the springs pressure safely.
Then the control arms can unbolt from the diff (cradle) and the outer hubs, leaving the half shafts in place, which act as upper control arms. Those lower arm bolts are pivot bolts with bearings. Once removed I suppose then the hubs would be dangling at odd angles, still attached to the diff by the half shafts.
Others will add to this or correct me as necessary.
YES. You won't have to remove the differential, drive shafts, or half shafts. But you will have to release tension and remove the springs and lower shock bolts to let the control arms free. You can do this by removing the lower sub-frame plate attached to the bottom of the diff (lowering it on a jack). Spring compressors can be used as an alternative method, but it is not required to use them; just good judgement and procedures to release the springs pressure safely.
Then the control arms can unbolt from the diff (cradle) and the outer hubs, leaving the half shafts in place, which act as upper control arms. Those lower arm bolts are pivot bolts with bearings. Once removed I suppose then the hubs would be dangling at odd angles, still attached to the diff by the half shafts.
Others will add to this or correct me as necessary.
The following 2 users liked this post by SleekJag12:
briansanders (08-16-2023),
Mkii250 (08-16-2023)
#3
The following 2 users liked this post by countyjag:
briansanders (08-16-2023),
SleekJag12 (08-16-2023)
#4
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Thanks for your reply! I'm actually changing the rear shocks and the bolt that holds the bottom if the shock in place has seized itself to the control arm due to rust. So I've decided to just replace the arm. However, it looks like the bolt that attaches the arm to the differential, will hit the bottom of the trunk when I try to remove it and not slide all the way out. That's why I was asking if the entire drivetrain needed to be lowered.
#5
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Thanks for your reply! I'm actually changing the rear shocks and the bolt that holds the bottom if the shock in place has seized itself to the control arm due to rust. So I've decided to just replace the arm. However, it looks like the bolt that attaches the arm to the differential, will hit the bottom of the trunk when I try to remove it and not slide all the way out. That's why I was asking if the entire drivetrain needed to be lowered.
#7
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Thanks for your reply! I'm actually changing the rear shocks and the bolt that holds the bottom if the shock in place has seized itself to the control arm due to rust. So I've decided to just replace the arm. However, it looks like the bolt that attaches the arm to the differential, will hit the bottom of the trunk when I try to remove it and not slide all the way out. That's why I was asking if the entire drivetrain needed to be lowered.
If you however just need the lower shock bolt removed and its seized solid, you can simply cut it off at the shock and then punch it out, there is enough space to cut it with a fresh 115mm cutting disc and replacement bolt is £15GBP from Jaguar. Mine was so seized into the shock that no amount of heat would get it out hence why I've cut it off.
If you go the wishbone tie route, consider getting a wishbone tie with the extra ears for the rear anti roll bar AND replace the individual diff dogbones with a monoframe from XJ8, these are one of the best upgrades for the X300 and completely transform how the car drives and holds to the road, they aren't expensive either, just a lot of spannering
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The following users liked this post:
SleekJag12 (08-19-2023)
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#8
#9
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this is an easy job if you take it all the way to the ground. use a bigger impact while another dude goes full throttle with an air hammer.
i’ve seen someone do it with the monostrut unbolted so it hangs low then torch. if the car is rusty no chance
i’ve seen someone do it with the monostrut unbolted so it hangs low then torch. if the car is rusty no chance
Last edited by xalty; 08-26-2023 at 12:29 AM.
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