i have a D-30 and 8.25 29 spline in my 00' XJ correct?

 

If it's an 8.25 then yes you should have the 29 spline.

 

You have a LP D-30(low pinion) The low pinion D-30 is not as strong as a HP D-30. If you go above 33's swap out to a HP D-30 when you re-gear.

A dead giveaway that you have a D-35 rear is if you have ABS. ABS was never used on the 8.25.

If you look at your differential and you see a flat bottom under the cover then you have a 8.25, its very noticeable.

 

Don't cheap-out on gears. Spend the money on quality products....you'll be glad you did.

 

no ABS, s its an 8.25. thanks. i thought it was but im just now looking into and learning about axles on my XJ.

 

No ABS could be a D35 or an 8.25.

 

i looked it up just a minute ago. it is an 8.25. 29 spline. so thats good.

why does the low pinion make the d30 weaker? i know pinion angle isnt as great but ive been running 33s for a long time and have seen no problems with my LP D-30

 

I have a 94 Cherokee with hp30 in front and 8.25 in rear with 3.55 gears. I ham lifting 6.5 longarm and gunna run rather 33 or 35 what gears would I need as this is my dd and trail rig?

 

www.grimmjeeper.com

 

I don't know all that Info

 

Just select your tranny and transfer case from the pulldown menus. Enter the gear ratio and tire size and then click on CALCULATE.

 

Do it once and be done, 4.88's, do a full case locker in the front as well. The D-30 stock carrier is weak(ask me how I know) and you will have to buy a new carrier anyway due to the gear change, might as well get a full case Detroit or ARB.

 

It's the way the gears rotate, not the axle itself. The ring & pinion is stronger in the HP.

I believe it was explained like this-

The LPD30 is 30% stronger in reverse.

The HPD30 is 30% stronger when going forward.

 

This is an 8.25 rear end. Note the way the axle housing sticks out past the cover.



And just for reference.

 

ok so whats the easiest front diff swap thats not a D30?