Hello all,great site,learning alot. I am the new owner of a 94 XLT. So far I've experienced all the wonderful symptoms you guys have been talking about. The mysterious check engine light,appearing then vanishing. Finding out about the wonderful world of the code 41 transmission. The decisions of what gear lube to use . I'm glad I'm not alone...The truck is stock and I'm thinking about some bigger tires first. My guess is the 30 x 9.50, then to the rear....?