37" Krawler dilema...

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[quote author=Curran link=board=2;threadid=14229;start=msg132846#msg132846 date=1081136051]
I actually like the way my truck looks right now. And since I’m trying to introduce the new woman in my life to my addiction, I’d like to keep my truck the simple unintimidating way it is. I just don’t want to turn it into a beater like Mikes.

[/quote]

I just got the OK from my wife to do whatever it takes to let the tires fit and work well....so here I go...I think I'll make the plunge. change out the 4.56 gears to 4.88, re-do my castor (front is welded via norm's method, now I need to weld the rear portion of the front control arm to allow more castor change), add some additional spacers all around (2"), remove roof rack (I THINK if I do this I can get back in garage, gonna have to do some measuring), adjust my front and rear panhards, adjust the upper rear control arms, (koyo front cv being worked on as we speak), I alread have 2" bumpstomps in rear so I think that should be enough.

...anything else?

Kumar
 
[quote author=LandCruiserPhil link=board=2;threadid=14229;start=msg132840#msg132840 date=1081135850]
37x12.50x17 BFG T/A no triming no contact

[/quote] FWIW i run 37 inch SSRs with 6 inch springs, havent lowered the bump stops (dont really plan to) and i have rubbing. BTW i have no flares or mud flaps.
 
Well, since you decided to go ahead and run them, I guess I won't waste my efforts or time telling you why not to. I still think it's stupid though.

A couple things to consider though before you do some of what you propose:

Consider selling your 4.56 set ups, no I don't want them as that's what I have, but others are saving up for that swap so you could basically sell them and put in 4.88's for a few pennies.

You say you spend 10% of your time on the trail. Are you sure? That's like 3 days a month or 36 days a year. Is it half of that or even less?

Anyone that says they can run a trail on 37's that they couldn't on 35's I'll claim is bs'ing until I see it myself. There is not that much difference and good spotting would easily make up for any difference. In my view, too many people are going bigger tires, using more pedal and thinking they are bigger men.

Yes, I run 36's. If you read a lot of my posts, you'd also know that I think 33's are the ideal size for a dd/trail rig. Obviously Christo's yellow thong doesn't count considering all the mods he's done to it.

T - actually, you know how much I like the 295s for street. They are perfect for what I want.

In the end Kumar, do whatever the heck you want. Just remember, you asked the question, so you got answers.
 
I'm agreeing with Junk on this. His logic makes a lot sense. Plus I'll add that the Krawler was never meant to be a daily driver tire. You are going to see major wear. I can buy into his less than 10%, and I wouldn't calculate it in days. Calculate it in miles. If you drive your rig 20k per year and you do 100 miles of hard trails a year you would be much less than 1%. If you get them for free, sell them and buy yourself a set of 17" wheels or keep your 16" and spend a bit more and get some 37" MTRs or whatever you like. I sent you a PM on Pirates about this. But a guy in our club had both Krawlers and MTRs and it is amazing that whenever I see him on the trail he always has the MTRs on his rig. I also agree about the spotting and driving being more important than tire size. Watched a guy with 37 TSL Radials work and work and work on a section of trail yesterday in a 40. Dual ARBs. 2 40s later and an unlocked 40 with 32s made it look much easier. 2 more 40s and a 33" SSR equipped 40 with a rear locker spanked that section of trail. Yesterday, my 80 was held back. Not by the 35s but by my driving ability and willingness to accept body damage, 37s would not have made a difference.
 
[quote author=LandCruiserPhil link=board=2;threadid=14229;start=msg132840#msg132840 date=1081135850]
37x12.50x17 BFG T/A no triming no contact

[/quote]

OK, we have found time and time again that street testing does not really work. Every time we test for contact on the ramp, we are amazed that we end up with rubbing on the trail. This is a picture of a 315 MT/R with 5" of list (which when compressed does not really matter much) rubbing AND the bumpstops are lowered 2". Granted, they are on 10" wheels, but you need that when you go up in height as well as tire size.

Also, Kumar, why go to 37" tires, the weld some drop brackets to the bottom of the existing ones to correct the caster. I can put money on it, that you will get hung up on those time and time again and the 37" tires are not going to help any.

Yes, you will break stuff if you wheel it hard. I have broken birfields with 315's, so has Robbie and others I know.

I am all for big tires on the 80, but really only if you need and use it. I think a daily driver 80 with 37's is about as good as a Chevy truck with 6" of lift used for towing. Not worth the compromises. Unless you daily driving is 1 mile a day and it looks cool parked in front of the office. :D

Also,
 
no linky mr slee. oh now it works.
and for my .02
I've seen trucks on 36-inch diameter wheels breeze through stuff that left me stacking rocks and cautiously maneuvering through to keep sensitive parts safe.
the addition of 37" tires will not help you here. This just my opinion so take it for what its worth and I am by no means attacking anybody. just saying it liek I see it.
with the 37" tires I can almost gaurentee that you will have more breakage than you would with 35" tires. I think anyone who runs 35+ tires will agree here. this is partially a physics issue and partially a now I can go for that line I wanted to issue. neither is your freind. I would think If you plan on doing this at least plan on carrying two spare birfs and the seal kit in the truck with you when you go off road. chances are you will need it. also listen to christo on the front end castor blocks. he knows whta he is talking about. Well as I have very little to say here as I don't plan to ever go above 33" tires I will step down.
Dave
oh and if you sell the 4.56 let me know.
 
[quote author=Junk link=board=2;threadid=14229;start=msg132586#msg132586 date=1081102865]
Kumar, Where do you wheel and what terrain? Such as; sandstone rock, clay mud, granite rock, dry dirt etc. It makes a big difference. The more info you provide the better the responses can be.
[/quote]

Kumar doesn't wheel!! :flipoff2:

Kumar, the 37's will steal a bit more power, which is good, your truck needs to be slower than mine, so go with them and go with heavy steel wheels too. Oh, and pull your lift off, if we wheel this summer my Lexus needs to outshine your Lexus.. :D

As for the tire rubbing, I don't know if I believe the 37's won't rub story. This is a picture of my 315x75 MTRs when I first got them. This is really tweaked and it all depends on how far you let the tire go up in there, by adjusting the bump stops. In these pictures my bump stops had not been adjusted at all, but there is a VERY small amount of room in there, the tire was actually hitting the tread front and back in wheel well...so I don't think there is any way a 37 is going in that far, maybe alittle way into the wheel well...
 
[quote author=sleeoffroad link=board=2;threadid=14229;start=msg133143#msg133143 date=1081189197]
One other thing to know, if you overcompress the springs tilll the coils touch, you will get coil bind and your springs will loose their rate pretty quick. Just FYI. In Marks picture, I can bet you the coils are over compressed.
[/quote] Can you elaborate a little more on this. what piont is to much. is it when the springs are fully compressed and touching? would the SOF5FM/SOF5RM be any stronger/resistent to losing thier rate or is this kind of SPRING THEORY and applies to all springs? Thanks for any help.
 
Yeah, what exactly is that Christo...so it's bad to have the coils all touch? So the bumpstops should be adjusted so you can never fully bottom out the springs?

Actually in that picture I wasn't as tweaked as I can get now, that was with my rear swaybar on, now with no swaybar back there it goes crazy...funny the last trail run some dudes with us in a FJ40 were giving me grief about bring a Lexus up there, then we went through this nasty part, big rocks, etc. They were watching and when I got to them, they said, hmmm, that Lexus flexes pretty good doesn't it.. :D

Later...
Mark
 
A lot of good info here
http://www.rpmnet.com/techart/spring.shtml#bind

It is not a good idea to compress the springs repeatedly until the coils touch. Since the 6" springs are stiffer spring rate I believe it won't happen as easily, but will still happen.

On the ShortBus I run OME860's in the rear and they are pretty much trashed after 1 season of wheeling. They lost a lot of height as well as stiffness.

It is just something to be aware of. Not much you can do if you wheel your truck hard.
 
[quote author=Junk link=board=2;threadid=14229;start=msg132975#msg132975 date=1081171797]
Well, since you decided to go ahead and run them, I guess I won't waste my efforts or time telling you why not to. I still think it's stupid though.

A couple things to consider though before you do some of what you propose:

Consider selling your 4.56 set ups, no I don't want them as that's what I have, but others are saving up for that swap so you could basically sell them and put in 4.88's for a few pennies.

You say you spend 10% of your time on the trail. Are you sure? That's like 3 days a month or 36 days a year. Is it half of that or even less?

Anyone that says they can run a trail on 37's that they couldn't on 35's I'll claim is bs'ing until I see it myself. There is not that much difference and good spotting would easily make up for any difference. In my view, too many people are going bigger tires, using more pedal and thinking they are bigger men.

Yes, I run 36's. If you read a lot of my posts, you'd also know that I think 33's are the ideal size for a dd/trail rig. Obviously Christo's yellow thong doesn't count considering all the mods he's done to it.

T - actually, you know how much I like the 295s for street. They are perfect for what I want.

In the end Kumar, do whatever the heck you want. Just remember, you asked the question, so you got answers.
[/quote]

Junk I always appreciate your candor (sp?). So yes, I do appreciate any/all responses I get from you and others.

As far as the 4.56...they are as good as sold as we speak.

10% trail time...you are right...it's not quite that much. at least not hard core trails...some of the time is off-road...just not severe. But I like the looke too. Just like getting 35" trxus tires...I like to try new things. If it doesn't work out...I can report back...if it does...ditto there.

Also, last year I ran a ledge that could have easily been taken by 37" tires. I had 35" and had to backup and stack rocks (with a little go pedal) to get the extra umph I needed to get over.

The sensible in me is saying to stick with 35" tires...but the "I live only once" is telling me to go 37" :)

I'll keep reading and weighing all my pro's and cons before I make my final decision.

...again thanks Junk for your comments, always appreciated!

Kumar
 
[quote author=mabrodis link=board=2;threadid=14229;start=msg133133#msg133133 date=1081188103]
Kumar doesn't wheel!! :flipoff2:

Kumar, the 37's will steal a bit more power, which is good, your truck needs to be slower than mine, so go with them and go with heavy steel wheels too. Oh, and pull your lift off, if we wheel this summer my Lexus needs to outshine your Lexus.. :D

As for the tire rubbing, I don't know if I believe the 37's won't rub story. This is a picture of my 315x75 MTRs when I first got them. This is really tweaked and it all depends on how far you let the tire go up in there, by adjusting the bump stops. In these pictures my bump stops had not been adjusted at all, but there is a VERY small amount of room in there, the tire was actually hitting the tread front and back in wheel well...so I don't think there is any way a 37 is going in that far, maybe alittle way into the wheel well...


[/quote]

blah blah balh that's all I heard "ma" "brodis". :flipoff2:

as far as rear bump stops...yes I put 2" spacer blocks back there cuz i did hear that compressing J-spings were bad for business.

I'm wondering how long ago wit was when 80s owners were saying 35" was too much ;)... btw, 35" have worked very well on my rig, that's why I'm thinking of stepping up.

...now I'm thinking twice about running 37" inch tires...granted they aren't oversized like swampers. I saw a pic of someone's on pirate and they measured just shy of 37"

kumar
 
[quote author=sleeoffroad link=board=2;threadid=14229;start=msg133077#msg133077 date=1081182091]
One other thing. I don't think you will be happy with 4.88's and 37" tires. I would go to 5.29's.

[/quote]

do you recommond yukon (same as PG) or toyota. If toyota...what is the part number?

i've been kinda afraid of 5.29 since the pinion is so small...yeilds to larger breakage. I was thinkin going with 4.88 now, and then supercharging/turbocharging in the future.

...always can count on the internet for varying comments!

so confusin'.

Kumar
 
[quote author=ginericfj80 link=board=2;threadid=14229;start=msg133007#msg133007 date=1081175761]
I'm agreeing with Junk on this. His logic makes a lot sense. Plus I'll add that the Krawler was never meant to be a daily driver tire. You are going to see major wear. I can buy into his less than 10%, and I wouldn't calculate it in days. Calculate it in miles. If you drive your rig 20k per year and you do 100 miles of hard trails a year you would be much less than 1%. If you get them for free, sell them and buy yourself a set of 17" wheels or keep your 16" and spend a bit more and get some 37" MTRs or whatever you like. I sent you a PM on Pirates about this. But a guy in our club had both Krawlers and MTRs and it is amazing that whenever I see him on the trail he always has the MTRs on his rig. I also agree about the spotting and driving being more important than tire size. Watched a guy with 37 TSL Radials work and work and work on a section of trail yesterday in a 40. Dual ARBs. 2 40s later and an unlocked 40 with 32s made it look much easier. 2 more 40s and a 33" SSR equipped 40 with a rear locker spanked that section of trail. Yesterday, my 80 was held back. Not by the 35s but by my driving ability and willingness to accept body damage, 37s would not have made a difference.
[/quote]


are you sure you are not talking about "competition" krawlers...as they are softer in compound? I remember a post on pirate showing good wear on krawlers in their non-competition rubber form.

Kumar
 
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