I currently have general grabber srl red letters which are 35" tires and they weigh the same as if not more than bf Goodrich km2 37". On my Dana 30 front end is there any difference on wear and tear on my axle? The weights of my current tire are the same if not more than moving up to 37's anyone's input??

 

Its not the weight of the tire, its the leverage of the 37" tire that will damage your axle. Gussets on the front axle is a must, even with 35's and hard wheeling. If you go 37's, maybe invest in some chrome-moly axle shafts all around, try not to put a locker in the front cuz the.d30 ring and pinion is very small and most likely be the weak link. The weight of the tires has effect on the performance of accelerating and also braking. If you install larger, heavy tires. Lets say they are each10 pounds heavier. The extra rolling weight of ten pounds equals 100lbs. So with all four tires, thats like loading up your jeep with 400lbs of stuff and driving it all the time.
People always say bigger is better, but unless you have the money to upgrade your axles to dynatracs, I would stay with 35's. Your jeep will look bad ass tho but all in all your only gaining an 1 extra inch of ground clearance for your axles.
I have been running 37's for over a.year now on.my '12 4dr rubi and installed evo sleeves, gussets, rcv axle shafts, factory wheels with 1.5" spidertrax spacers and so far I blew out the passenger front wheel bearing,all 4 ball joints and broke the rear locker.

 

X2. Overall size has more impact than the weight of the actual tire due to leverage.

 

However, keep in mind you can wheel with brains and not beat your rig to hell when you know it's not properly built

I've wheeled my rig through many trails, many times, and no - not fire roads, lol. While it's not OVER THE TOP crazy, I will say it's harder stuff than your average wheeler. Wheel hop is usually the most common culprit, along with steering components, and just all around anything else when it comes to carnage on the trails.

Point is, I have 60k miles on my jeep. Yea, I might have better ball joints, a stronger tie rod/tie rod ends, and gussets - but I have a stock Dana 30 up front, 5.13's, and Toyo 37's that the tire alone weighs 93lbs. No sleeves, no chromoly axles, no hydro assist, no HD knuckles, no HD brakes, no blown hubs/bearing, and cause I wheel smart - 99% of the time, I go where anyone else goes with all the extra bells and whistles.

Hell, if you got the money - go for it. I'm not the final word. Shit - if I had the money, damn right I'd get even more than I already have, but too often do I see people taking what people say on here too literally and get all these extra things and they wheel like once a decade on a back road, but think cause they have all these good parts they wont break anything, and they still do cause you can ALWAYS break shit if you're inexperienced.

Btw, I'm totally not being a jerk or saying people are stupid - just trying to give my side of things. Like I said, so much hype on any forum that people think they need dana 60's, full axle truss, etc. Saw some dude write like a college thesis about if he should get 34's or 35's cause he isn't gonna gear just yet, and is worried about losing .5 MPG and then worrying if he should have gone bigger cause everyone says you should. LOL

Ok, sorry - I'll stop. Again, I'm just talking my piece...... not trying to step on any toes.