Here's the deal, have an 88 V6 4WD. Don't have 2nd gear or overdrive, hits first just barely, and cruises in 3rd like a champ. Clearly a trans issue. I'd rather go with replacing the unit as opposed to trusting a vague description of a rebuild kit online. My question is what are my options on replacement. What year models can I pull from that would be compatible. Thanks in advance for any info.