Dana 30 HP differential case

[TexasCherokee4x4]

What is the highest gear ratio you can run on a stock Dana 30 HP Differential case??
I've looked everywhere and I can't find an answer. Many thanks guys.

[Frank Z]

The carrier break is 3.55 and down.

[TexasCherokee4x4]

Awesome thanks a bunch.

[techno1154]

Originally Posted by Frank Z

The carrier break is 3.55 and down.

Carrier break in and of itself may not be the correct answer. The other carrier starts from 4.10 to 1. From what I have heard you could go upto 5:16 to 1 or is it 5:38,...I will have to look it up. However, most guys on advise against going with too deep of a gear ratio. They claim the ring and pinion become too small thus making them weaker. The tallest I think is about 2:70.

[SolarBell]

The numerically highest gears for the Dana 30's in the XJ are 4.88's, but as Frank Z said, the stock carrier maxes out at 3.55, so a different carrier is required.

The later model JK Dana 30's can do 5.13's. but still not really recommended.

[RWKHausSupply]

Depending on Which D30..

Highest # in a XJ HP - 4.88
Lowest # in a XJ HP - 3.07
That I know of..

[RWKHausSupply]

Originally Posted by SolarBell

The numerically highest gears for the Dana 30's in the XJ are 4.88's, but as Frank Z said, the stock carrier maxes out at 3.55, so a different carrier is required.

The later model JK Dana 30's can do 5.13's. but still not really recommended.

FYI, the D30RS (JK) 5.13 pinion head is still larger then a 4.56 or maybe even a 4.11 ~ D30R. It is a good D30 actually, well internally.

[TexasCherokee4x4]

Originally Posted by SolarBell

The numerically highest gears for the Dana 30's in the XJ are 4.88's, but as Frank Z said, the stock carrier maxes out at 3.55, so a different carrier is required.

The later model JK Dana 30's can do 5.13's. but still not really recommended.

This is the exact answer I needed.