Lift and driveshaft angle question
 

I've got an 03 TJ Rubicon that'll get a 2" Old Man Emu Lift and a 1.5"
engine lift (also same body lift, to fit full skidplate). What
driveline problems should I expect & plan on, what do I need in order
to fix those problems, and should I get new driveshafts made?

Thanks for your help

Andrew Whitley

Re: Lift and driveshaft angle question
 

Andrew!

What's up?

Anyway, I'm going to stab at your question, even though we've probably
talked about this before anyway. Now all those people on this forum
who have helped me figure this stuff out in the past can have a chance
to tell you why I'm wrong ;-)

From what I've found when researching the lift for Aaron's rubicon,
you're definitely going to want to do something about the rear
driveshaft, most likely involving replacing it with a new CV shaft
(the stock rubicons still have u-joint rear driveshafts, after all).
You'll also have to have a shop machine the output shaft from the
t-case to have a CV flange rather than a U-Joint flange as it does
stock. Since the rubicon already has a slip yoke on the t-case output
shaft, though, you won't have to mess with that (which will save you
some money).

Since your full skid plate will raise the t-case along with the engine
(right?), your effective lift of the output shaft of that t-case with
respect to the rear axle pinion will be in the neighborhood of 3 to
3.5 inches, depending on how much that skid raises you. That, in my
opinion, puts you in need of a CV rear driveshaft, especially since
the rubicon t-case, as I understand, is longer than the np231 on the
regular TJ, resulting in an even shorter rear driveshaft.

Ok, there's my go.

Now, be careful out there in mortarville!

/Bob

andrewmuaddib@hotmail.com (Andrew) wrote in message news:<8b5c891c.0312300600.3c3ebcd2@posting.google. com>...
> I've got an 03 TJ Rubicon that'll get a 2" Old Man Emu Lift and a 1.5"
> engine lift (also same body lift, to fit full skidplate). What
> driveline problems should I expect & plan on, what do I need in order
> to fix those problems, and should I get new driveshafts made?
>
> Thanks for your help
>
> Andrew Whitley

Re: Lift and driveshaft angle question
 

Andrew!

What's up?

Anyway, I'm going to stab at your question, even though we've probably
talked about this before anyway. Now all those people on this forum
who have helped me figure this stuff out in the past can have a chance
to tell you why I'm wrong ;-)

From what I've found when researching the lift for Aaron's rubicon,
you're definitely going to want to do something about the rear
driveshaft, most likely involving replacing it with a new CV shaft
(the stock rubicons still have u-joint rear driveshafts, after all).
You'll also have to have a shop machine the output shaft from the
t-case to have a CV flange rather than a U-Joint flange as it does
stock. Since the rubicon already has a slip yoke on the t-case output
shaft, though, you won't have to mess with that (which will save you
some money).

Since your full skid plate will raise the t-case along with the engine
(right?), your effective lift of the output shaft of that t-case with
respect to the rear axle pinion will be in the neighborhood of 3 to
3.5 inches, depending on how much that skid raises you. That, in my
opinion, puts you in need of a CV rear driveshaft, especially since
the rubicon t-case, as I understand, is longer than the np231 on the
regular TJ, resulting in an even shorter rear driveshaft.

Ok, there's my go.

Now, be careful out there in mortarville!

/Bob

andrewmuaddib@hotmail.com (Andrew) wrote in message news:<8b5c891c.0312300600.3c3ebcd2@posting.google. com>...
> I've got an 03 TJ Rubicon that'll get a 2" Old Man Emu Lift and a 1.5"
> engine lift (also same body lift, to fit full skidplate). What
> driveline problems should I expect & plan on, what do I need in order
> to fix those problems, and should I get new driveshafts made?
>
> Thanks for your help
>
> Andrew Whitley

Re: Lift and driveshaft angle question
 

Andrew!

What's up?

Anyway, I'm going to stab at your question, even though we've probably
talked about this before anyway. Now all those people on this forum
who have helped me figure this stuff out in the past can have a chance
to tell you why I'm wrong ;-)

From what I've found when researching the lift for Aaron's rubicon,
you're definitely going to want to do something about the rear
driveshaft, most likely involving replacing it with a new CV shaft
(the stock rubicons still have u-joint rear driveshafts, after all).
You'll also have to have a shop machine the output shaft from the
t-case to have a CV flange rather than a U-Joint flange as it does
stock. Since the rubicon already has a slip yoke on the t-case output
shaft, though, you won't have to mess with that (which will save you
some money).

Since your full skid plate will raise the t-case along with the engine
(right?), your effective lift of the output shaft of that t-case with
respect to the rear axle pinion will be in the neighborhood of 3 to
3.5 inches, depending on how much that skid raises you. That, in my
opinion, puts you in need of a CV rear driveshaft, especially since
the rubicon t-case, as I understand, is longer than the np231 on the
regular TJ, resulting in an even shorter rear driveshaft.

Ok, there's my go.

Now, be careful out there in mortarville!

/Bob

andrewmuaddib@hotmail.com (Andrew) wrote in message news:<8b5c891c.0312300600.3c3ebcd2@posting.google. com>...
> I've got an 03 TJ Rubicon that'll get a 2" Old Man Emu Lift and a 1.5"
> engine lift (also same body lift, to fit full skidplate). What
> driveline problems should I expect & plan on, what do I need in order
> to fix those problems, and should I get new driveshafts made?
>
> Thanks for your help
>
> Andrew Whitley