Your 87 Wrangler used a Peugot BA 10/5 Manual 5 speed transmission (I am assuming you have the 4.2L straight 6). When the 4.2L was discontinued in 89 the AX15 was substituted and provided somewhat higher durability. During the 80's and 90's Chrystler used anything they could find to shove on a jeep, Renault/Peugot leftovers from AMC (mostly to cut costs in an attempt to curb labor problems and weak sales) parts on the Jeeps (hence the Renix ignition system, AMC 2.5L, etc.) Although AMC's 2.5L was almost an exact copy of the GM Gen IV Ironduke (which was a POS. Lol) it ended up being a fairly exceptional piece of equipment. The 97 model jeep wrangler TJ found some new equipment available such as the redefined body. Anyway, in 2003 the Jeep AMC 2.5L was discontinued in place for a more modern DOHC 2.4L (same engine used in the Dodge Neon only with a slightly longer stroke) and the AX15 was replaced fully by the 5 speed NV3550 which is a GM transmission designed from the NV4500 used in chevy trucks (Built by New Process Gear, the manufacturer for the Transfer Cases for Jeep and Chevy since 1990 but has been in business since the dawn of the automobile, 1888). Bottom line, the NV3550 boasted extreme durability on and off the trail. Quadratec offers both the NV3550 and NV4500; however, I am not sure if the bolt pattern is the same on the 4.2L and the 4.0L. I can try to let you know if you are interested. New Process has designed and constructed all of the transfer cases from their plant in New Jersey and are all very capable monsters, boasting the highest record of reliablilty for 4x4 systems. The version you experienced in the 2003 jeep TJ would have been the NV241 most likely although the NP231 might have still been available. I have an AX5 myself and it has been a pretty rugged machine but the NV transmissions, especially the extremely beafy 4500 will hold up to anything on the trail.
Thursday, January 8th, 2009 AT 10:26 PM