Outcast Spiral cut or straight cut?

[Glitch]

Hi all!
I need some help deciding between these two RCAWD diffs for my 4s.

I am not looking to buy these,I actually have both and am going to get rid of one. The components seem to be the same quality, but the spiral gears mesh better and I prefer them. The spiral gear sticks about 8mm out from the diff case, whereas the straight cut gear sticks out about 4.7mm. When you look at it this way, the spiral set is the obvious pick.

Now, the issue- the spiral cut input gear doesn’t fit into the center diff output gear, so I would have to try to get it in with a little tweaking (which has been done). I also am waiting on RCawd to tell me if they have fixed the part, in the meantime as I said I’d either have to mod it or something. It’s worth noting that I believe the rcawd spiral gears are also the same as the HR gears.
Sorry for the long winded post!

 

[Bustedaw11]

Spiral.cut is a stronger design if that helps you.

 

[Glitch]

Spiral.cut is a stronger design if that helps you.

that’s what I was thinking. Do you think there’s a chance I could somehow make the center diff input bigger to fit it?

 

[Hector_Fisher]

Spiral cut teeth offer more surface area for gear contact, spreading out the transfer load to more material.

However, the material in question is always a limiting factor, IMO. Gears with spiral cut teeth made out of cheese will be stronger than gears with straight cut teeth made out of cheese--but at the end of the day, they're still gears made out of cheese. Generally, i'd say the extra cost for spiral cut is not worth it, but those are just my cents.

Side note: Are you saying you're trying to run a spiral cut front/rear diff gears on your center diff spur??

 

[Glitch]

Spiral cut teeth offer more surface area for gear contact, spreading out the transfer load to more material.

However, the material in question is always a limiting factor, IMO. Gears with spiral cut teeth made out of cheese will be stronger than gears with straight cut teeth made out of cheese--but at the end of the day, they're still gears made out of cheese. Generally, i'd say the extra cost for spiral cut is not worth it, but those are just my cents.

Side note: Are you saying you're trying to run a spiral cut front/rear diff gears on your center diff spur??

Thanks!

Thankfully, these are some pretty good hardened steel which I’ve run before.
So the issue is the input at the back of the center diff (which I’m leaving stock straight cut gears on) doesn’t fit over the aftermarket RCAWD spiral cut diff input gear. For some reason. (The older straight cut RCawd gears, which were released before the center diff, fit )

 

[Micron]

Spiral cut is just better!

 

[Bustedaw11]

Wrong thread

 

[Dales396lt4]

I like Spiral cut gears. I have them in my K4s v2 with the new v2.5 diff and it fit fine..

 

[Doom!]

Man, I thought this thread was going to be about ham.

 

[Neelis]

I like Spiral cut gears. I have them in my K4s v2 with the new v2.5 diff and it fit fine..

From which brand you have spiral gears?

 

[Glitch]

I like Spiral cut gears. I have them in my K4s v2 with the new v2.5 diff and it fit fine..

Really? Which brand? If it's HR, I think it's compatible with RCawd and I could just buy the HR diff input gear.

From which brand you have spiral gears?

Haha great kinds think alike

 

[Dales396lt4]

I have the HR up front and a RCawd in the rear. both have been in the truck for some time now.

 

[Glitch]

I have the HR up front and a RCawd in the rear. both have been in the truck for some time now.

Really? And it's the spiral cut RCawd too?

 

[Dales396lt4]

You know now that I am thinking about it, I think that one has HR in both front and rear. I have two, one with a 4s slipper and one with the v2.5 diff. both have spiral gears.

 

[Glitch]

this one

That's great to hear. Maybe I can buy just the HR input gear

t

You know now that I am thinking about it, I think that one has HR in both front and rear. I have two, one with a 4s slipper and one with the v2.5 diff. both have spiral gears.

hese? https://www.amazon.com/Hot-Racing-A...refix=hot+racing+gears+arrma+4,aps,142&sr=8-4

 

[Dales396lt4]

One k4 has rcawd and one has hr I will have to look an see. Sorry,I just do not remember.

 

[Glitch]

One k4 has rcawd and one has hr I will have to look an see. Sorry,I just do not remember.

View attachment 365246

View attachment 365247

No problem, I'm guessing you have the HR in the center diff one, but if you find out let me know!

 

[Dales396lt4]

I will look at it to night after work. I can try and fit the power mod in the other k4 to see if it fits.

 

[Just a hobby]

I've had the HR spiral cut diff gears and aluminum cases. No sign of wear and I've been running them since 2019. Only had to replace one aluminum diff case. O-ring wasn't sitting right and all the fluid leaked out and friction hit quickly and internal gear pins ate the aluminum causing bad mesh. I had to cut one outdrive pinion to fit the new plastic nut thing in the back end of the slipper clutch plate.

 

[MrTitanium]

I’ve run the HR spiral-cut units and the Arrma steel straight-cut units (not the cheapo sintered 4s units). Long story short, I prefer the straight-cut units.