I have a 93 YJ with a stock dana 30 front end, 4.11 gears and 33 tires. I was pulling out of my driveway and the front left tire locked up. Luckily it was on a dirt road and only about 10 MPH. I was able to roll the jeep forward but will not roll backwards. I was able to limp home by just creeping forward. Any ideas on what might be broke?
Pulled the diff cover and everything looks ok. It seamed like it might have been low on oil, only about a glass full, and what oil that was in there was pretty brown and watery. I just bought this jeep and I'm learning he wasn't very good at keeping up the maintenance.
Yes there is some moisture and some surface rust. The oil is more like mud. I'll pull the hubs off next and check them out. It will probably be a couple days before I can get to that. Thanks for the help so far.
Wow that thing is toast. Clean with brake cleaner and hope the bearings arent toast from the moisture. Pinion looks possibly chewed as well. Personally I would get a new Dana 30 off CL for $150. That thing is a timebomb.
Check your rear asap.
Complete rebuild axle/engine/everything swap in progress:
Parts already gathered for assembly: 2001 Ford 302, 1990 Mustang GT 5.0 ECU and wiring, NP435, NP205, Pair of axles from 04' F350 SuperDuty (Sterling 10.5 Posi rear, Dana 60HP Front-Both Disk Brakes 3.73 Gears), 37" H1 Tires, 9" lift TJ Coils for 2 link conversion in front, Stage 2 Clutch Kit, 3 Row Aluminum Radiator, Chevy Astro Steering box (4" front Stretch), XJ Rear Leaf Springs (6" Rear Stretch), and lots more.
I pulled the front end apart and found that the pinion bearing had come apart and was seizing up when rotated backward. The carrier bearings were bad as well. So new bearings and seals will go in this week. The gears look good so I can reuse them. There were no shims for the carrier, is that normal? Any tips on replacing the carrier and pinion?
Just take your time. If there weren't any shims, then you should re-install it as such. However, check your tolerances, and back lash. I can't remember if a D30 has a pinion crush sleeve or not, but you will want to replace that as well with a new one and torque your yoke nut back down and check back lash.
If you don't have a manual PM me and I can possibly get you a link to an online one.