I just put on some 37" m/t's and i was wondering if i am going to be running into a lot of problems with these tires on like suspension breaking, or maybe something with the tranny or anything?

 

There is no doubt that the larger & heavier the tires are, the faster your front end components will wear and the greater the chances are for a major failure.
Usually when I see a major front end failure amongst my hunting club friends, it's with tires larger than 35" on IFS front ends.
Most of the larger "chain" type 4x4 shops won't do it, or at least make you sign a warranty & liability waiver before performing such work.
Personally, my limit on an IFS truck is 35", however I know guys who have 37" & taller tires that have had them for a while without issues. Likewise, there are a few guys on here that have 37's on their 1500 series trucks and as of yet have had no issues. I am by no means saying you will have catastrophic failureswith your front end, I am only saying that the chances are higher as tire size and cv angle increases.

As far as engine & tranny wear, it's gonna be a strain on both components, especially with only the 4.7L. I'm hoping the place where you had it done stressed the importance of re-gearing and did that for you as part of the lift and tires modification. If not, I'd get at least 4.56 or possibly even 4.88's in that truck asap...

 

Yeah i figured i would need to regear to the 4.56. Would anyone know how much the speedometer would be out from switching the tires.

 

the tires i switched where 265/70/17 to 37/12.5/17 if that helps any.

 

17.4% off
when your speedometer reads 60 you'll actually be going 70.4 mph

 

thanks mmstar ive been searching for awhile now trying to figure it out

 

just go to google, type in tire calc, and click on the link that says miata tire calculator. they dont have an exact size for a 37" tire, but i played around with the sizes to get to 37.1" diameter. and it gives you all the info there.

 

how is that 4.7L doing pulling thoughs 37s around?

 

Not to bad so far I just put them on Saturday. Went and did some mudding saturday night and it didnt have any problems going through that, still a lot of power. Don't really want to see how much power i lost by stepping on the gas on the road because im scared my gears or something might break under all that pressure.

 

With the 4.7L you might want to consider 4:88 gearing! I have the 5.7L with 37" tires and 4:56 gears. If I had the 4.7L I would have seriously considered 4:88!

I have had the 37" tires for about 30,000 miles and love them! No front end issues yet! (knock on wood) I have only had the 4:56 gears for 5000-6000 miles! You will notice a HUGH difference when you get new gears! And if you are going to do the new gears then you should see about getting a Detroit Tru Trac LSD! You can probably get a deal since they are going to be in the rear Diff anyway!