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I want to buy a shift kit as a Christmas present for my son's 74 Duster. It has a slightly overstock Commando 273 with a 904 and 3.21 8.25 differential. What's the consensus of these two brands and what's the popular product to use/buy? Thanks. I need to order soon, so fast advice is appreciated.

I bought an NOS sure-grip differential on eBay for my kid's Duster. These are from a lot of old stock and loose and unboxed, therefore no part number. However,they are marked on the case with the number 18-05-039-903. Please tell me this is the correct size case for 3.21 and lower gear ratios...

Hey guys, I finally got the Duster (273 & 904) on the road and I'd like to install part-throttle kickdown in the valve body to help it along. Can I simply pull the housing and plug off of a slant six tranny and slap it on? or is there some other tips I need to know? I haven't cracked open a...