Topic: what will 38's break

[dune_it86]

Ok I have an 86 toy ex cab that is gonna get a sas the axle going in it will be stock exept it will have 5.29's and I will spool the rear i plan on using ifs hubs in the front to match the rear width. I might get a smokin deal on some 38.5x14.50x15 SX's would it be worth it or should i just get some 37 or 36 tires the truck will be 90% off road and it is a carb 4cyl 5spd.  all stock but i am hopping on getting a webber and an offenhauser manifold and a header but thats in the future

[wa4x4]

Birfs. Upgrade the birfs and you should be okay. What do you mean by IFS hubs up front? Most people use the stock Aisin hubs with a spacer so it evens out the front/rear width. If you try hard enough I'm sure you can snap an axle shaft, but just keep an eye on everything and you should be fine.

[Short_Bus]

Definitely upgrade your Birfs because that will be your weak point right now.  I run 38's with 5.29's and locked front and rear with stock birfs right now, I'm upgrading soon but I've been about 5 times and have not had a problem yet.  As long as you don't hammer on it with the tires cut too sharp you should be fine for a little while.  The birfs will eventually let go with that much rubber on them though.  38's ROCK!   

[FIREBALL]

Yep, I third that. Got to upgrade the birfs. Marfields or Longfield with the chromo inners too.
The IFS hub setup works great and you'll definetly like having the better front brakes with the 38's on there.

[Loosekannon]

I run 38's and have broke 2 hubs. But it was a Warn and a Milemaker that I broke. Put some stock ones back on. But definitely upgrade the birfs. That was the first thing I did after getting 38's, called up Longfeild and got some super 30's. Love them

[blackdiamond]

gotrocks has 5.29 gears with 37x14.50 tires and he managed to break a set of Profields (which damaged the splines on the inner axles) and a stock spare, all in two days in Moab.  He upgraded to a set of 30-spline Longs and the pinion (Yukon Gears) broke a couple of days later.

His plan is to get the front ring & pinion cryo heat treaded by Bobby Long and then add some additional studs to the hubs (arp?).

I would spend the coin and just get some of Bobby Longs axles.  The 27-spline might be ok, but saving a little money doesn't seem as smart when fixing broken parts on the trail.

[79coyotefrg]

run 35's

[dune_it86 [OP]]

why whould i run 35 I have had fun with 35's on the trail but i go big and bad so i wanna get the big stuff right from the starti just dont know how big factory will hold

[wa4x4]

why whould i run 35 I have had fun with 35's on the trail but i go big and bad so i wanna get the big stuff right from the starti just dont know how big factory will hold

Only one way to know for sure.

[864runnershortened]

I would run the 38's.   That is what I am currently running exactly 38.5 X 14.5 X 15 SX's.  They rock.  Just wish they made a 39.5 like 15.5 - 17 wide SX.    MY vote is for upgraded Birf's.  and probally interaxles.  I have broken many of stock birfs before going to 30 spline inters and chromo birfs.  If you wanna go big go big.  I wish I would of went bigger from the get go. 

[Hyena]

Run the 38's.  You won't have a locker in the front so i wouldn't worry too much.  But keep off the throttle because you never know what can happen.

[Willy Mammoth]

I would never trade my 38's for anything, except for 42's.

38's are ok, but you most definitely want to go with stronger axles.

[toy4xchris]

i ran 38s then went back to the 35s but they arent as much fun so 38s are the way to go just upgrade the birfs and cromo inners and your good.

[Bender]

Any one have trouble with rear pinions?  I was running 38s on my Cruiser and snapped a couple of pinions.  Not sure how much different a 76 cruiser rear is from a mini truck though.   

[Hyena]

i have heard of a lot of cruiser breaking the rear pinions. 

You also might want to make sure the rear axle is straight.  My buddy welded atruss on his rear axle for his 4 link.  The axle warped and he ended up snapping both rear axles.

[Ramrod]

YOU DO NOT NEED TO UPGRADE THE BIRFS WITHOUT A FRONT LOCKER  I don't know how many times I see this come up but it is totally unneeded.  One tire will have a ton of trouble getting enough torque to it to break a birf or anything in the front without a locker.  Ironclads friend runs 40" boggers on stockbirfs and hasn't broke one.  I ran 36's for a while and beat it hard

[IronClad]

yup yup !  no locker? dont bother !  (hey that rhymes..)  i broke one birf on a open front end  but i was WAYYYYY over turned and bangin it up a rock face.  my pitman arm was set wrong  so it steered to the right ALOT more than it should have.

i know lots of guys that run stupid big tires on toyota fronts.. 40s/42s/44s and DONT break.   theres a guy up here that is running 49" iroks on a DANA 44! and a 44 is GARBAGE ..  and  when he does break  he is breaking stubs and not inners  which are what usually 99% of the time go first.

heres a pic of the rig on 40s and  stock birfs  ( original from 1983 ! same ones that have always been in the truck)   this truck has seen a beating..  those birfs should have broken a LONNGGGG time ago.   anybody who has been to morris lake.. i jumped that truck in 3rd gear double low out of the top on the bottom half..    full throttle assaults all the time.. that thing should have exploded by now. 

[Ramrod]

yup thats the truck I saw.  He actually was saying to someone else as I was trying to go up that climb with my tires aired up "What the Hell kind of Axles does He have?"  because I was beating them