We recently purchased a used vehicle and I had my wife added as a co-borrower so that she could get a tradeline in her history. We went to a local CU and had only one hard pull. After everything was finalized and we purchased the car, my CK score went down by 35 points whereas my wife's remained the same. The loan did show up under both of our names in CK. What would explain such a big drop for me and 0 change for my wife?
I should note that her history is fairly short and clean while mine has dents in it. Since my income is higher, my score was used to determine interest rate.
