Granite BLX Differentials in Stock

[bicketybam]

EDIT: You also need (4) M2.5x12 cap head screws for the diff case. You can reuse the screws for the stock housing.

I went to Tower Hobbies and ordered the parts needed to build 2 new BLX differentials. They are all in stock. I ordered (2) AR310872 (Diff case), (2) AR310873 (HD Input Gear and (1) AR310875.Everything else should transfer over from my extisting diffs. The BLX gears are much thicker and the input shaft is metal. Total cost was $36.10 but I opted for the two day shipping. Without shipping it was $31.11.

These diffs should be bullet proof. The final drive ratio is almost the same as the stock diffs (2.864 vs. 2.882). And less than $16 a diff isn't bad for something that should last forever. The rest of my initial order for my Granite should be here today (what I just ordered will be for the Senton). I will post up some pics when I get them.

Has anyone ordered/received any of the new motor mout/slipper parts?

 

[bicketybam]

The BLX diff case is on the left. Big meaty gears!

 

[bicketybam]

Since I have the gaskets I went ahead and threw some 10k diff lube in there

 

[bicketybam]

I edited my original post. You cannot reuse the 4 screws to secure the top and bottom of the diff case. You need four M2.5x12 cap head screws. I only had M2.5x8 cap heads but used them for now.

 

[bicketybam]

Diffs are in and ill-fitting T-Bone bumpers are on. I’m headed out to field test.

 

[Mustangman66$]

Looks good how did the new stuff fit for planning on upgrading my to

 

[bicketybam]

Everything tested great. Such a worthy upgrade! First thing I noticed was how quiet my Granite became. And smooth. The diff gears mesh perfectly and the input shafts spin on axis. The sure didn’t with my homemade input shafts!

I took it outside and ran it around on my backyard bash site for 8 or so minutes. Then I packed it up and went to the skatepark. I hit hit some of the smaller jumps inside the park and then went and jumped it over the 18’ fence and onto the grass. I had some pretty bad landings but everything was fine until the last jump land perfectly upside down. A kid ran over and flipped it for me but I had no power. Turns out the ESC came unstuck and pulled the battery wires out. I’m lucky I didn’t tear any of the other wires like the switch. I took it home and restuck it while adding a zip tie. I should be good on big air now

This upgrade is well worth it if you plan to run 3s or a big motor. You would be hard pressed to ever round out the gear teeth. I landed on the front tires several times and in the past I would hear the teeth slip (I run a tight slipper clutch). Not this time. I’m very pleased.

 

[chazekxt46]

man those tire's look really big

 

[bicketybam]

man those tire's look really big

They’re really not. Same size as stock, just a lot deeper tread.

 

[larrys4227]

I used the original diff assembly screws. No clearance issues and works just fine

 

[larrys4227]

Your looking at the original rear input gear. Since last November, it's been taking the abuse of a 3900kv motor with 22t pinion. Maybe it was a special composite blend ...

 

[bicketybam]

View attachment 21674
I used the original diff assembly screws. No clearance issues and works just fine

I tried that but it was really hard to screw them in so I stopped.

 

[larrys4227]

There are no threads in the diff ... When you run the screws in for the first time, the screw cuts its thread so will be hard to turn. I made the first 3-4 turns by hand to get it started and straight, and then ran them in with my little electric screw gun