View Full Version : can toy diffs handle big tires

08-05-2006, 12:57 PM
ive got a 1989 4 runner with an 85 front straight axle and a factory electric locker in the rear. Is's got a 11 inch lift and half ton leafs in the rear and the rears are up front with custom shackels. I need to get some new tires and i want to get 38.5 by 16 wide but i dont know how well the axles will take it. id change the gears to 5.29s but is that too big of a tires or should i just get 36's

G-rizzle Swank
08-05-2006, 01:04 PM
i run 35x14 boggers with no troubles at all, but im only locked in the back and i were to be locked in the front i would prob break the fronts, i know a guy that ran 40" boggers and a half decent 350 in an 83 toy, and appareantly he never broke an axle in almost two years, its all how you drive it

08-05-2006, 01:17 PM
I've ran 39.5" Swampers, and 38" Michelins on stock toy axles... welded in rear. I do agree it's all in how you drive it. Abuse anything and it will break.

08-05-2006, 01:50 PM
If you run 38's I would put longfields in the front.

08-16-2006, 11:45 PM
get 30 spline longfields and all the other stuff you need like arp studs and new bling hub gears. front range offroad sells the studs.

you will eventually break a rear shaft, might take awhile but maybe not when it does break then upgrade.

08-17-2006, 12:41 AM

lots of guys run fodies with all that stuff.

Its not not worrying about breaking axles anymore :cool:

08-17-2006, 09:28 AM
I run 37's, i run 5.29's, havent had a problem yet

08-17-2006, 10:43 AM
i have the 38.5 x 16 wides was runnin em on a d44 front.. that sucked... BUT the toy axles r stronger and bigger than d44.... i have also blown the rear 14 bolt with these tires.... but its all how you drive.. i only drive my truck on the weekends so she gets driven pretty hard when i gte a chance too...

08-17-2006, 01:04 PM
toy axles are the shit
you shouldnt have any problems, except d/s eventualy, just go to square...its kinda clunky, but virtually indestructable

08-17-2006, 03:31 PM
I wouldn't run anything bigger then 33's you would prob brake first time out

08-17-2006, 03:32 PM
i make the appropriate changes to your truck

08-17-2006, 03:34 PM
english please?

not goodie goodie dirka mohmmad dirka dirka jehad

08-17-2006, 03:51 PM
im gona take your tierse and replace them with some 32" allterains so you dont have to worriee about breaking them

08-17-2006, 03:55 PM
thanks now I don't have to worry[cheers]

08-17-2006, 03:56 PM

08-17-2006, 04:54 PM
yes you can.

08-17-2006, 05:10 PM
you cant run big tires on toy axels:D

what are you thinkin ,you must be crazy:cool:

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08-17-2006, 05:11 PM
nope i wouldent runn "big " tiers on a toy diff

08-17-2006, 06:17 PM
well you goin hard core with your rig or you goina mall crall with it .....im running 37x15x12.5 IROCK's on my junk and 5.29's and it has takin repeated burnouts and harsh beatings and is still holding up but its more the frontend that you need to be worried about so i would say like manyothers definatly go for a set of longs in the fornt ...but one other thing is that 5.29's arnt known for beeing the strongest gearset either

08-17-2006, 06:18 PM
also have to decide if your locking the front or not, you should be fine being open but once ya lock the front might start breaking shit

08-17-2006, 07:49 PM
you can run 49" tires on toy axels if yeah want....

theres a lot of stuff you need to think about like:

are you welding / locking the front
are you going to have a heavy foot
what is your budget
how often are you going to wheel
is this a daily driver

all these things are somethin to consider

08-17-2006, 07:53 PM
me personally I have 2.5 years of wheeling experiance with this truck, I have broken three shafts, stock one, ofield, and a smurfield, I am running 5:29's with 37...you drive it nice and you should have to many problems...start welding the front turning really sharp and hammer down yes things will snap...even with 35's I broke a birf...but thats me and I wheel as much as I can...not to much latly mind you hehe

08-18-2006, 06:39 PM
It's really a question of how you are driving your truck. If you were bogging and just going high revs I'd prolly say you'd be fine cause you wouldn't be granny gearing it. If you were cruising for girlies at the beach you'd be fine there too. If you were going to start competition rockcrawling then we'd have a slight problem. I know a few people that have run tires up into the 40's fine with nothing more than a new set of axles. I also know a local guy that's running 38's with a 4.3 Vortec and he's good to go with no breakage, but he mostly drives on-road and does the occasional boggin' Again, all about how you drive, and how many horseshoes you have up yer ass. [41]

sj-x 500
08-18-2006, 09:03 PM
just depends how heavy your foot is. what kinda gears your rig has, and the age/condition of the steel in the axles. you can break axles unlocked if you spin em then they hook up, like a root in a mud pit. but yes, 35's and toys are the breaking point generally speaking, with longs and cromo's in the rear, you could push a v8 and 35-38's. just have to be gentle. and belive it or not, autos do save axles

08-26-2006, 08:29 PM
i run 37 mtr's with 5.29s and detroit trutracs in front and rear. daily driven and wheeled fairly often.

if you lock the front without upgrading the axles, it will break sooner or later. doesnt matter if its 35's or 44's

like sj-x says, the abrupt change in momentum is whats gonna break rear axles. They will last alot longer with the 4cyl versus a v8 for sure.

08-28-2006, 12:52 AM
My old yota I ran 38.5x16 TSL's with a happy 350. I did go through 3 rear diffs in the city as it was pretty cool doing smokshows [15] I ran a lincon locker in the front and only poped one berf as I was running one hub unlocked to turn around and tried to drive over a stump [2] I think most people who knew me that are in here would agree that I was not easy on the truck at all.

m j
08-28-2006, 06:46 AM
start with longfields in the front