HELP! ARB install Q 27 or 29 spline 8.25?

[saburai]

Time to order my lockers. No tag on the diff...
Is there any way to tell if it's a 27 or 29 spline rear?
My truck is a '99 AX15 HP D30 front, Cryco 8.25" rear non ABS XJ.

TIA:elkgrin:

 

[Backwoods Rambler]

Your '99 XJ should have the 29 spline

 

[BIGdaddy]

yup, 97 and up have the 29 spline.

'91ish to '96 can have the d35 or the 27 spline 8.25.

There's always odd birds in any vehicle line, but you should be good, since you're well past the cutoff year.

 

[SWbySWesty]

ARB eh? I just ordered an Aussie for the rear...enough coin leftover for skids

ps: +1 on 29 spline on 1997+ XJs