Dude, defeat to 4.56s and your zj will pull so much easier.
00 4.7 Laredo...KYB gas shocks, ADDCO rear sway bar and Firestone Destination tires.
08 Z71 Suburban, front leveling kit with rear spacers. 285/65 18s Nitto TerraGrappler G2s
94 5.9 Laredo 6.5 RE lift with 35 Maxxis Bighorns
and 33 Bridgestone Duelers
Detroit and true trac
Red Jeep Club Member
Texas Jeep Owner #6
USN Jeep Club #4 http://www.kevinsoffroad.com/
Yes, the overdrive is weak and can get burned out easily. Light on means O.D. is off. That light is also the transmission overheat warning light. When the transmission gets too hot it automatically turns off the O.D. until it cools off so you won't know if it's getting too hot or not but since it's downhill you should be more worried about the brakes. I overheated my trans going uphill and I had the O.D. off. The white smoke from the ATF-4 spewing out let me know something was wrong.
We used to pull a 21 foot Sea Ray behind a ZJ. pulled her just fine even on longer trips. The trailer did have hydraulic brakes though, but also a much heavier boat. Going down hill may be tough on your brakes though.