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I would rock it then. Just keep the wheel speed low.
 

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I ran 39.5" IROKS on my truggy/buggy for 2 years on toy axles. Broke more parts than I can remember but know that I broke hubs, knuckles, older Longfields, rear stock shafts, ring and pinions, and a lock right. I never broke a new 30 spline Longfield (installed after ruining the ringed ones) but I broke every part at least once in the axles so carry spares of everything else if you buy Longfields. Oh yeah, and I am relatively gentle with the skinny pedal.
 

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i would say depends on how you drive. i wheeled with a guy with a heep and he had a locked 30/35 combo on either 36s or 37s with no breakage:eek:. but wheeled with sense and a light foot. so im sure they could hold up but the question is for how long.
 

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I am running 39.5" iroks on dirty 30's and a spooled rear with no issues. I have a very light foot since I drive my shit to the trail and still have to get home. I am throwing a lockrite in the front and we will see what happens. I am on 4.88's also.
 

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I am running 39.5" iroks on dirty 30's and a spooled rear with no issues. I have a very light foot since I drive my shit to the trail and still have to get home. I am throwing a lockrite in the front and we will see what happens. I am on 4.88's also.
i certainly hope that dirty 30s can hold up with a lockrite and 39.5s. i plan to move up to 39.5 from 36 one day with my 30s and lockrite but i dont have a light foot. im also running a diamond housing and 5.29s too.
 

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My old truck is still running 39.5 Iroks. 30-spline Longfields, Detroits, 4.88's. I broke four 27-spline birf's in one weekend.... :laughing:. The 30-splines are holding up though.
 

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i certainly hope that dirty 30s can hold up with a lockrite and 39.5s. i plan to move up to 39.5 from 36 one day with my 30s and lockrite but i dont have a light foot. im also running a diamond housing and 5.29s too.
A good buddy of mine who has ran 39.5's for the last 3 years has arbs f and r and runs his shit into the ground with no issues. Its all in how you drive. The rears are fine, on the fronts adjust the steer stops so you aren't turning so tight and taker easy on the skinny pedal.
 

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Do it, but buy longfields or dirty 30's. 39.5 tires are pushing the limits of Toyota axles, even with upgraded parts. You will brake parts if you wheel hard, but it is all part of the sport. :flipoff2:

 
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