Why low pinion in TJ?

[stephenspann27]

I don't understand why a low pinion front axle is used in the TJ, and a high pinion (better axle) is used in the XJ. Seems like it would be the other way around if anything.

Does it have to do with the short wheel base of the TJ, and drive line angles?

 

[tbburg]

Vehicle design is always a compromise. The axle choice for a TJ was probably made due to a packaging issue. 'Never looked into it, but the TJs front axle is further forward(in relation to the engine) then an XJs, so a TJ front drive shaft is longer. For some reason the exhaust down pipe on a TJ wraps around the front of the oil pan. There's probably a clearance issue between the pipe and a HP axle drive shaft at stock height.

Edit: a better question would be why did Jeep and Chrysler continue to replace the Dana 44 with any other piece of crap they could find in every vehicle jeep makes?
CJ? lets swap out the D-44 for a weakest version of the AMC-20 we can engineer
XJ? -44 optioned from the beginning. But lets use the d-35, or a 27 spline version of the 8.25
YJ/TJ? See "CJ", and trade D-35 for AMC-20
ZJ I know, we'll use the D-44, but in an ALUMINUM housing! That'll save money!

 

[srmitchell]

Id say a clearance thing. (Exhaust)

When the xj switched to the low pinion in 2000-01, it was for a few reasons-
-The precat header design needed more clearance
-It was probably easier to just make 1 front axle for both tjs, and xjs.
-It might of been signaling the end of the xj run.

 

[NW-ZJ-SCOTT]

Edit: a better question would be why did Jeep and Chrysler continue to replace the Dana 44 with any other piece of crap they could find in every vehicle jeep makes?
CJ? lets swap out the D-44 for a weakest version of the AMC-20 we can engineer
XJ? -44 optioned from the beginning. But lets use the d-35, or a 27 spline version of the 8.25
YJ/TJ? See "CJ", and trade D-35 for AMC-20
ZJ I know, we'll use the D-44, but in an ALUMINUM housing! That'll save money!

Worded to perfection!

 

[RichP]

Me, I'd like to waterboard, under hoover dam, that SOB that decided who jeep was going to buy their evaporators off of.
Some little oddities, the TJ's don't have the grease fitting in the front drive shaft, all three, TJ, ZJ and XJ all use different sized air filters, how stupid is that.

 

[kastein]

Me, I'd like to waterboard, under hoover dam, that SOB that decided who jeep was going to buy their evaporators off of.
Some little oddities, the TJ's don't have the grease fitting in the front drive shaft, all three, TJ, ZJ and XJ all use different sized air filters, how stupid is that.

Don't forget the different fuel level sender assembly on MJs. They probably could have put the opening in a different spot and made it the same as the one in an XJ, or changed the design on both so they'd be common, but noo.... they didn't.

And the RENIX 4.0 vs RENIX 2.5 vs HO 2.5/4.0 ones are different, so SOMETHING isn't gonna work no matter which way you swap.

Trying to find a new HO MJ fuel level sender assembly up in the rust belt is like looking for a needle in a thousand haystacks. I got real lucky and one of the guys on here found me one in the south, where rust doesn't exist.

I'd love to find the guy who came up with the ideas for what to change in 96 and what to change (again) in 97, and then AGAIN in 98, also :bs:

 

[joe_peters]

Well, at least all of those engineers are now working for Fiat.