So I saw my first picture from my local club of a JK D30 spider gear failure!
This motivated me to ask the question to the all JK forum:
How is your 30 holding up to the tires you are running?

Me - Been running 35's for 35,000kms, wheeled it 8 times last summer with two TJ's on 35's and an XJ on 33's. So far nothing broken. Only modifications are a heavy-duty rock-smashing differential cover, and some TMR Customs C-gussets. I have a mini-truss (goes from pumpkin to upper control arm mount) ready to go on before this wheeling season starts.

 

No problems here on my 35's. Let's hope it stays that way when I go up one more size in a few weeks

 

Scared to go to 37's so I guess I will be holding off on that.

My 30 has evo C gussetts, and 44 magnums. Need to get an aftermarket pumpkin head but I really would like to find a used 44 and beef the hell out of it.

Anyways back on track, 30 is doing fine right now. No real problems that i know of. Just always nervous taking it out with 35's on it.

 

Dana 30 is holding up as well as expected on 35's. no failure, no C gussets, just stock dana 30 on 35's. wheel it pretty hard too.

2007 JK Unlimited 6 Speed 4.10 Gears
3 Inch BDS Lift
35x12.5x16 Yokohama Geolander AT/S
16x8 Cragar Soft 8 Black Steel Wheels
Custom front Winch Bumper from RoundStar OffRoad
Mopar Offroad Rear Bumper
Oilpan/Tranny skid Plate by Skid Row
JKS Quicker Disconnects
Skyjacker Brake line extenders
Skyjacker Adj Rear track bar
High Clearance Adj Front Lower Control Arms by RocKrawler
RocKrawler Front Lower Control Arm Mounting Bracket/Skid Plates
Warrior Products Rear Safari Doors
Plenty of ROCKRASH

 

I've had my 35s on now for about six months and have went out only twice this winter and haven't had any issues. That is however one of the things I want to build up before it breaks and I get stuck somewhere.

 

I also have been rolling 35s on my D30 for roughly 9,000 miles now. Wheeled it about 8 times since the lift/tires upgrade. Just installed LCA skids and I'm adding gussets just to be safe...but I haven't had any real issues thus far.

My plans are to regear and add lockers and driveshafts. And 37s. Might need a D44 for that though, not sure....

 

so far so good on my orange JK but then, i'm only running 35's

 

So far so good with 48k miles on mine. Got C2s in the mail yesterday, waiting on a currie track bar bracket because my holes got wallowed out but as far as the 30 goes, holdin up well. havent wheeled it since i put the 35's on but will be asap.

 

So far so good. 28K miles, wheel it once or twice a month, Evo C gussets, 4.88's and Aussie JK30 on 35" Toyos.

 

good to go so far. but then i'm only running 35's like most. when it fails i'll go to 60's front and rear. then i'll do my 38's.