Is a T Case Drop or SYE Needed?

[304Pittman]

I'm wondering if I need a Tcase Drop or SYE or Both.

1990 4.0 with D35

4.5 Inch Lift & 285

 

 

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[Dzimm]

You would never need an SYE and a tcase drop at the same time.. You shouldn't need an SYE with only 4.5"  When I swapped a C8. 25 into my 4.5" MJ I ended up shimming the axle 6*.  That may have been due to my welding of the spring perches not perfectly so yours may not be that far off.  

 

Are you getting vibration? 

My recommendation would be to check the angles and just shim the axle side if you need it.  Shims are cheap and it can be done in a couple hours.  

 

Tcase drops are quick and easy but cause other issues like shift linkage binding and it can cause your mech fan to be super close to the rad.  I run my XJ with one and I can't shift into 4Low because the linkage binds and I never got around to fixing it. 

[304Pittman]

I don't get any vibration I've only had it up to 50mph. I haven't took it on the highway yet.

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[Dzimm]

That's good that you aren't getting vibes.  The "general rule" is if you don't have vibes you're probably fine but I'd still suggest measuring the angles to be sure.  The better your angles, the longer the u-joints will last.