Mega Dropdown Menus affect SEO results?

[Mobile_ID]

Our e-commerce website http://www.autoidsavings.com has a mega multi-level dropdown menu on top that we wanted to re-design. The real problem is the Shop By Brand menu which hovers down to 4 level at most. Our options are:

1. Limit the dropdown menu to 2 levels total. (currently have 4 levels the most)

2. Completely remove Shop By Brand Menu and create a page like https://www.cdw.com/content/brands/?cm_sp=GlobalHeader--Products|Brands--Home

My concern is that will either changes help or destroy our SEO results?

[Thriveworks-Counseling]

I checked out your site. You are right, the brand dropdown is a rough experience for the user.

Can you create a columned navigation that spaces out the choices? Something similar to that would be what Dicks Sporting Goods has on their homepage : http://www.dickssportinggoods.com/ They have a lot of choices, but they are spaced across columns in the nav drop down.