COURTESY OF MIKEMTJ:
Well, I'm making this post to help some of the newcomers understand what they have, and provide a few great resources. This isn't a guide that has my advice, or my opinions...just straight facts about whats in your Jeep.
4.2 L AMC 258 was used from 1987 to 1991
4.0 L AMC 242 from 1991-1995
2.5 L AMC 150
Peugeot BA-10 1987-1989
Aisin AX-15 1988-1995
TF999 1987-1992 Non lock up
TF999 1992-1995 Electronic Shift
The electronic shift years could be wrong.
Aisin AX-5 1987-1995
Some YJ's from 1987 came with the NP207, the rest came with the NP231
Frame is rated to pull 2,200 pounds.
Differential Gear ratios
3.07 or 3.55
From everything I've see, these are the most common. If someone could
throw some more numbers out there with years, that would be great.
AN EXCELLENT RESOURCE FOR INFO, AND ENGINE/TRANNY SWAP INFO:
Novak Jeep Conversions - Home
GEAR RATIO GUIDE:
Jeep Wrangler Gear Ratio Guide
Jeep Parts, Jeep Accessories, & Jeep Tops
Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec
HOW DOES MY HEAT WORK?
MY CHECK ENGINE LIGHT IS ON. OH CRAP.
MY STEERING IS GOOFY. WHAT TO DO?
MY SEATS SUCK! WHERE CAN I FIND CHEAP REPLACEMENTS:
There are a few things that could be wrong in here, and if you see anything wrong please say so. Also, if there are some other threads some people would find useful from the past, please put them in a comment!
Hope this helps some people out!