A: If you have a 4 cylinder, 5 speed manual, you have an AX-5. If you have a 6 cylinder, 5 speed manual, 97-99 TJ's have the AX-15 transmission. From 2000+, you have a NV 3550. If a 3 speed auto (97-02, 4 and 6 cylinder) you have an 32RH. A 4 speed auto ('03+) is 42RLE (not 100% sure on this one). Your transfer case for all TJ's (except for the '03 Rubicon) is the NV 231 (2.72:1 low range). The '03 Rubicon is a NVG 2410R (4:1 low range).