If I was to use a th350 instead of the sm465 how low in the diffs would I have to go to equal/come close to the crawl ratio of the 465, if I had 4.56's in the diff's now? The reason I'm asking is because there is a 80 k5 for sale with a marine 350, th350, np205. 35" tires, new axles w/3.83? gears. The thing has almost no rust to speak of (very rare here in Canada) and the guy is asking $1600. The power windows, locks, and rear sliding window all work fine. Problem is that I was really looking forward to the crawl ratio of the standard but I found this truck in decent shape with the auto. I wasn't dead set against an auto so I wonder how close I can get to the crawl speed if I use lower diff ratio's. This is a DD though so it has to retain streetability. I'm hoping to be able to go a top speed of about 100km/hr - around 65mph which is the highway speed limit surrounding my city. It won't see much highway but in case there is a road trip (BB03 /forums/images/graemlins/thumb.gif) I want to be able to make it.