Topic: May be required to increase to 35s, may be required to go up to HP D30

[Jeffy]

The only first hand knowledge I have of the HP 30 lies with 2 guys i know. My buddy Dom, who I've featured in a bunch of my posts/videos, runs 35s and just goes to town on the trail. He is currently saving up to build the D30 as i have intention to. Another guy i know, Erich, has a 4banger on 35s with an hp 30. He says his HP 30 was one of the more important upgrades for his rig. He regularly wheels, wheels it hard and his Jeep spends a good amount of time in the rocks. I understand the bullet proof advantage of D60s, but are they truly needed for 35s? Will a built up HP 30 not be adequate?

I think you're over thinking it.  Here's a friend of mine's YJ. He's on 36" TSL's.  I forget if it's stroked or not.  A built HP30 is pretty damn strong.  The only downside is gearing and the unitized wheel bearings.  They're cheap though.

[stan98tj]

A built HP30 is pretty damn strong.  The only downside is gearing and the unitized wheel bearings. 

well, i would be at 4.56 gears, so not an issue for the carrier. My neighbor says he can get me some HP30s for under 100 bucks, i think a reinforced/built up 30 will handle the 35s.
I'm not looking to run ridiculous trails or turn my jeep into a trail hog

[Jeffy]

well, i would be at 4.56 gears, so not an issue for the carrier. My neighbor says he can get me some HP30s for under 100 bucks, i think a reinforced/built up 30 will handle the 35s.
I'm not looking to run ridiculous trails or turn my jeep into a trail hog

If you can do one for next to nothing then I'd go that route.  It should be fine as long as you're not pounding on it and even then...  I thought you were going to stick with 33's?

[stan98tj]

I thought you were going to stick with 33's?

I would love to, and will stay at 33s as long as my RPMs are not pushed up given the 4.56 gears. If I do have high RPMs, I'll size up to 35s to counter. I feel though, that I may want to swap in a built up HP 30 even if I stay at 33s.

[Jeffy]

I would love to, and will stay at 33s as long as my RPMs are not pushed up given the 4.56 gears. If I do have high RPMs, I'll size up to 35s to counter. I feel though, that I may want to swap in a built up HP 30 even if I stay at 33s.

Why not drop down to 4.11's then.  IIRC, the HPA YJ was running 4.56's with 35's.  Stock axles are dirt cheap.

[stan98tj]

Why not drop down to 4.11's then.  IIRC, the HPA YJ was running 4.56's with 35's.  Stock axles are dirt cheap.

I don't know, i just felt like if it was between regear or size up, just size up.

[Mozman68]

for 35s D60 is overkill imo not to mention the lower hanging diff housing.

No they're not....


...and I have measurement comparisons on my rig build thread of where I was and what I ended up with when I went from 31's on stock axles to 35's on D60's front and rear...went up to 37's this past September.

[sharpxmen]

No they're not....


...and I have measurement comparisons on my rig build thread of where I was and what I ended up with when I went from 31's on stock axles to 35's on D60's front and rear...went up to 37's this past September.

are you saying that the housing is not hanging lower on the D60 compared to D30? doesnt' really add up, the ring diameter is larger so it needs a larger housing to accomodate it. I bet the housing is also thicker. I'm talking the same tires and not stock tires with D30 vs 37s with a D60

[Mozman68]

Of course it hangs lower with the same tires, but why go to D60's if you were keeping the same tire size?  I gained quite a bit of clearance going from 31's on a 3" lift to 35's on a 4" lifts hole switching to D60's. and I don't worry about my axles blowing up. 

[stan98tj]

Of course it hangs lower with the same tires, but why go to D60's if you were keeping the same tire size? 

well this started because i may actually need to increase to 35s as i'd rather do that than gear down. I am thinking an HP 30 will do fine on 35s.

[Mozman68]

well this started because i may actually need to increase to 35s as i'd rather do that than gear down. I am thinking an HP 30 will do fine on 35s.

You most likely will be...and it is at least worth the risk to save the money.  I would run the 35's and save up money for an axle upgrade later if you still need it.

My upgrade to D60's was more about bullet proofing my rig not just for larger tires, but I was originally planning on throwing an LS engine in there and was worried about my heavy foot.

[Jeffy]

My upgrade to D60's was more about bullet proofing my rig not just for larger tires, but I was originally planning on throwing an LS engine in there and was worried about my heavy foot.

I thought it was to one up the Joneses?  

[Mozman68]

I thought it was to one up the Joneses?  

That too....