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4.56 gears in a 7.5 with a lockrite


ecgreen

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I think I just used the red cutting wheels, I use those for almost everything... but one of the bigger orange stones would work just fine too.
Where those 5.13 gears ina 7.5? You must have had to cut a ton to get that pin out!
 


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Roert42

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Dirtman

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If you do it wrong the wizard that lives inside the differential comes out and punches you in the balls.
 

ecgreen

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Somehow you engine could explode and the truck will catch on fire?🤷‍♂️

Probably not.
Well, it is a Ford so its bound to happen someday.
 

ecgreen

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If you do it wrong the wizard that lives inside the differential comes out and punches you in the balls.
Just like marriage!
 

ericbphoto

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My credo
In theory, theory and practice are the same. In practice, they are different.
I like the top picture better. But, like someone said above, we're limited to the view we get in these pictures.

You don't want to grind into the contact patch. But a tiny bit won't hurt too bad. The way these gears work, the contact between gears occurs on several teeth simultaneously. Furthermore, you don't use reverse as much as forward and rarely as much torque in reverse as in forward. So concentrate on saving the forward contact patch more than the reverse.

Cleanliness is your big concern now. You don't want metal filings in there when you're finished.
 

scotts90ranger

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My 5.13's are in an Explorer 8.8, so it's much less material... I thought I had a picture, but apparently not.
 

ecgreen

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Well, I had to choose the side where I needed to grind two teeth. The other side would have required a lot more material to be used. Here are some shots before I brake cleaned it (so no yelling about the dust on the gear!). Had to take a lot more than I wanted to!
20210408_100200.jpg
20210408_100206.jpg
20210408_100212.jpg
 

ericbphoto

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In theory, theory and practice are the same. In practice, they are different.
Nice job
 

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Looks good.

It's kinda scary grinding into gears. I have reused things I shouldn't have at times, gears with chipped teeth and rust pits etc...so far they've held up...yours will be fine!
 

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Nice job. Make sure you debur and smooth those edges really good though
 

ecgreen

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Thanks guys, I couldn't have done it without you (a single tear rolls down cheek)!

Seriously though...thanks!
 

Dirtman

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Thanks guys, I couldn't have done it without you (a single tear rolls down cheek)!

Seriously though...thanks!
Let me know how it drives, I'm literally doing the same thing to my 09 in about a month. The gears and lockrite have been sitting on my shelf all winter. I have factory 4.10s but going from 27" to 30" tires and didn't wanna risk loosing a shred of power since I have a 4 cylinder. 4.56 brings it back to just a tad lower ratio than stock. If my math is right it will be the equivalent of 4.30 gears with the new tires.
 

ecgreen

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4WD
Total Lift
3"
Tire Size
33
Let me know how it drives, I'm literally doing the same thing to my 09 in about a month. The gears and lockrite have been sitting on my shelf all winter. I have factory 4.10s but going from 27" to 30" tires and didn't wanna risk loosing a shred of power since I have a 4 cylinder. 4.56 brings it back to just a tad lower ratio than stock. If my math is right it will be the equivalent of 4.30 gears with the new tires.
Will do! I am about three weeks out from completion. Waiting on a duff stage one package. Then it is reassembly time. I am running 33s with a very tired 2.9.
 
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