Lenovo T400 memory, hard drive, and keyboard replacement - YouTube
Lenovo ThinkPad T400 Intel Core 2 Duo T9600 8GB RAM 232GB Storage Windows 10 | eBay
8GB KIT (2 x 4GB) for IBM Lenovo ThinkPad T Series T400 T400s T500. SO-DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
Renewed Lenovo Thinkpad T400 Laptop C2D P8700 4GB RAM 500GB HDD Windows 10 14" 1600x900 Webcam With 30 Days Return, 90 Days Exchange Warranty
memory - Does Lenovo T400 can only work with up to 4GB RAM? - Super User