For a rebuild kit for your 4-5-6 Chevy K20 manual gear box try: www.truckandcarshop.com

I believe I have one, so send me a PM, if I can help. Have you considered converting your K20 to power steering? If so, let me know, I have done several of them on my trucks and a number of customer's trucks.

Tony Smith
4-5-6 Chevy Trucks
501 Scott Avenue
Kansas City, KS 66105
913-207-7789
[email protected]
Photos: http://www.flickr.com/photos/4-5-6chevytrucks/sets/
Custom Parts: http://www.flickr.com/photos/4-5-6chevytrucks/sets/72157627022818563/
www.4-5-6chevytrucks.com