[chijusa]

I'd like to know the effect of a different gear ratio on both diff. On torque curb and on towing comportment. I know that people who usualy tow prefer to use a bigger diff. ratio (commonly a 4-10 or close to that on american full size pickup). I tow about 30 - 40% of the time with my truck, so I'm looking for a way to make it a bit easyer for tranny, diff and engine, or at least increase a bit it ability to make a load moving. And get it better on hills towing.

I'm looking to get a Cortex Superchip, but it only increase a bit my power. I don't like using full throttle when towing, so I cannot expect something great of that. My real desire is to get torque curb down a bit at wheels, to get more torq, a bit more revs at a slower cruising speed without speed variation on every little bump on the road, and when facing wind. and off course possibly a better towing gas mileage.

I've a v6 kc SE with 5spd auto.

 

[penski61]

4wd or 2wd ?
bottom of the page , there is also a 3.73 option thats not listed
if your 4wd there is no option for the front gears but you could purchase the 3.73 rear gears and buy a front diff from a nismo kc manual
Frontier - Differential Gears | Nissan 4x4 Parts, Nissan 4x4 Off-Road Parts and Accessories | Rugged Rocks Off Road and Communications

 

[chijusa]

Yeah it's a 4x4...

The parts I would need are?
I'm not knowing alot about differentials and I don't realy know what to do to change ratio. Can I just change gears, or I must change all differential, or all axle?

I know that a larger ratio mean, with the same wheel sise, a greater number of turn fron driving to make a1 total rev. ohf the wheel, and at a same engine rev. a larger ratio mean less speed with same wheel size. Beside that...

If I understant well, I can change the gears in my rear diff, in the same "case" but will need to change the entire module in front?

 

[penski61]

you would need the master install kit as well as the ring and pinion for the rear , since you are 4wd 3.73 ratio is really your only way to go
( you need to have a professional install them )
the front is easier to install as an assembly

 

[Nissan4Life]

For some resaon I remember that the ratio is of my truck as being 3.69. Is 3.73 close enough.

 

[penski61]

yes stock is 3.69 , but 3.73 is a 1% difference i think youll be perfectly fine with that