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Hello I will help you with your question,
Click here for procedure
Look that procedure over and let me know if you are following all the steps.
You were able to just remove the old spring once you lowered the axle with the jack? Why are you replacing them? Sagged or are the new springs different from the old?
Oh, its the fronts you are having trouble with?
Look at that, some silicone spray will help get the isolator into the spring but if the isolator is crushed you will need to replace it.
Let me know if that clears it up
You should be able to lower the control arm on a jack enough to install/remove the spring without a compressor. The track bar needs to be removed from the axle to get the travel you need to install the spring.
Let me know what I can do to help