I was checking the VIN on my 1989 Wrangler Sahara and everything looks fine except for the engine number. Mine has a T in the 8th place which designates a 4.2L 258 cid for the 1990 year. Is it possible that it was a late manufacture and got a 1990 engine? the year code, model code, all others fit the 1989 only variation is the engine code. Anybody got an idea what this means? Is it one of those rare hard to find valuable things I always see on ebay? Thanx in advance for any help.