I have a 97 4dr 4X4 blazer that sits lower in back than front. Heard that to fix this just need longer rear shackles.

Been searching but can't find anyone that list them.

Does anyone have the part number for them or know who makes a 1 1/2 inch longer shackle?

 

Ebay is a popular source for them. If your blazer is sagging a lot, you may need new leaf springs. Shackles just move the springs down, if they are worn, it may not help a whole lot.