Junk... that is why they are $45.00! The boots are Neoprene, not Nylon! While the cheapies might operate properly for a short period of time, the boots will deteriorate quicker than wet toilet tissue! Then you will have a huge mess of CV grease to clean-up, this of course, only after you hear the clacking sounds coming from the now unlubricated joints letting you know they are junk! What is wrong with yours? The OEM axles are good for 300,000 miles. If you have a split boot, your dealer sells the AC/Delco boot kit, includes new grease too! Service dept. can easily install boot for you, as it takes a crimp tool that all GM dealers have. Just make sure you change the transmission output shaft seals. Those seals cost about $5.00 each, take about 10 minutes each to change! You might lose a cup of trans fluid total that will need to be replaced with change of both seals.
Cheers,
Timmy C
Cheers,
Timmy C