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Are eligible for USAA? Why is your score where it is?
If you can I would try USAA, call in instead of doing online application, they will call underwriting and explain situation if you ask. They may ask to see proof the collections have been paid. Otherwise I would try at a local credit union, they are usually more flexible than an big online lender would be. I can personally say the USAA process is great and super easy especially knowing the person is your friend. They mail cashiers check overnight once they recieve all the paperwork.
I'm not eligible for usaa, unless they give loans to civilians. I'm not directly related to anyone in the service.
I've tried golden 1 credit union, since i'm from california, but they denied me. I'm thinking about dcu, if not them, cap 1 sounds like they might approve me but I dont think they allow you to purchase from a private seller
FF
If you are set on getting your friend's vehicle I believe it will be exponentially more difficult if possible at all. You don't want to get too many Hard INQs to find out either. If you are simply in the market for a vehicle, I would consider looking at Alliant Credit Union. Alot of the members on here have touted how easy it is to join, and they would be a good place to look at for rebuilding your credit again too. Anyone can join directly on their website for a small donation.