Felony Rear diff questions

[Spackle-king]

I'm sorry, I know this topic has been discussed to death, but with 10 pages of search results for "felony rear diff", I'm having trouble finding the correct part number. On Amazon, the Arrma part listings are the most vague generic, unhelpful and sparse. I want to get a rear diff that is geared like the front, so I can (like every felony owner wants) run the same size tires in back.
https://www.amazon.com/ARRMA-Front-...6986&sprefix=felony+front+diff,aps,193&sr=8-3

That is what I see on Amazon, but it says "front or rear diff", which doesn't make a lot of sense, seeing as they are differently geared. I'm wondering if that is the diff I will need to put in the rear to be able to run smaller diameter tires.
And I know this is discussed a lot, but I am not experienced enough to do gear ratio math myself.
If I get a correct front diff and pop it in the rear, is that *all* I will need, gearing wise, or is there another gear I'll need to replace as well ?

I looked in the manual, and it appears the front diff is the ARA311023, which is the Amazon listing above, but before I pull the trigger, I'd like to know any other parts I may need. I've seen people talk about the Kraton wheel hubs to make the wheels farther out, to line up with the body shell, but that's cosmetic to me, and less important. I'm worried about proper gear ratio today

Thanks in advance.

 

[fozzy71]

Go here - https://jennysrc.com/collections/felony

Edit: OOPs. I missed the part where you wanted a front for the rear to make it like an infraction. @332_RC got it straight,.

You can get the full GP5 diffs from Jenny in the cases here - https://jennysrc.com/search?type=product&q=gp5

The ones out of the infraction are $9 less expensive than the ones on the Felony page for whatever reason.

 

[332_RC]

Then you'll have to replace both the rear diff & the rear main input gear to these below to match the front. These are the front 42/15

https://www.arrma-rc.com/en/product/front-rear-diff-set-42t-gp5-10k/ARA311023.html

https://www.arrma-rc.com/en/product/main-input-gear-15t-gp5/ARA311016.html

The rear is 45/14 the front is 42/15

 

[332_RC]

Go here - https://jennysrc.com/collections/felony

Edit: OOPs. I missed the part where you wanted a front for the rear to make it like an infraction. @332_RC got it straight,.

You can get the full GP5 diffs from Jenny in the cases here - https://jennysrc.com/search?type=product&q=gp5

The ones out of the infraction are $9 less expensive than the ones on the Felony page for whatever reason.

Good point on the price difference. We were talking about jennys doing that the other day! I've bought 6s diffs from there, V5 type, complete bulkheads with diff, & always go for the cheapest, because they are all the same. Kraton & Noto are $2 dollar difference.

 

[Spackle-king]

Then you'll have to replace both the rear diff & the rear main input gear to these below to match the front. These are the front 42/15

https://www.arrma-rc.com/en/product/front-rear-diff-set-42t-gp5-10k/ARA311023.html

https://www.arrma-rc.com/en/product/main-input-gear-15t-gp5/ARA311016.html

The rear is 45/14 the front is 42/15

Thank you. I was unsure of the names for the gears (like the input gear name) so this really helps spell it out for me. I've done 3 diff replacements on other RCs, so I'm familiar with the enclosed diff unit, and I know what the pinion and spur are, so knowing the input gear helps me further.

 

[332_RC]

Thank you. I was unsure of the names for the gears (like the input gear name) so this really helps spell it out for me. I've done 3 diff replacements on other RCs, so I'm familiar with the enclosed diff unit, and I know what the pinion and spur are, so knowing the input gear helps me further.

Good deal Glad to help!