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I was underneath my car the other day and noticed dampness on the left side of the third member and left side axle housing. I researched pinion angle adjustment and I am assuming that lowering my car threw the pinion angle off and is creating stress on the pinion seal. In order to fix this, I can either get an adjustable UCA or LCAs. When I was first looking into lowering my car, I never read anything abt lowering creating differential housing leaks.
My question is, if I get the adjustable UCA and correct the pinion angle, will I still need to have the seal replaced? If I do, am I better off putting the car back to stock and having the dealer replace under warranty? Any help is greatly appreciated.
Btw, my car was lowered on K springs. I noticed the damp spot when I jacked up the rear end to change the rear springs to sport lines. There is no splattering of fluid anywhere under the car, so I'm assuming the leak is not severe, yet.
There is an overflow port on the right(passenger) side of the axle that is a common leak. Make sure it's not coming from there first. I have never heard of someone's axle leaking simply because they lowered the car.
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2011 GT Black w/Saddle, 6MT, 3.73, BREMBO, Steeda CAI, Boss Intake, Steeda Tunes, Borla S-Type axlebacks, Dynatech 1 7/8 LT w/custom H-pipe, Pypes M80, Dynatech driveshaft, FRPP "P" springs, Koni STR.T, UMI adj. LCA and relo brackets, UMI adj. panhard bar, GT500 mounts, Joe Heck Racing Shifter, bracket, and clutch line.(2013 Setup) 12.19 @ 116mph 1.88 60' stock Pirelli's at MIR 438 rwhp, 421 rwtq...SAE Dynojet(2011 setup) 154.0 mph Texas Mile, Oct. 2011
1967 Fastback, 4-speed, work-in-progress
Since he says dampness on the left I'd expect it's not the overfill blowoff. However, the fill plug is on the left there and, even though it's sealed from the factory, I'd get the car up high and look at that first.
I've certainly seen pinion seals go because of misaligned driveshafts, plenty. You can see this most commonly in the jacked-up 4X4 world but it can happen going the other way, too.
The replacement is a mild pita but, you can do this yourself if you're very careful measuring the amount of threads exposed and the position of the pinion nut. Do so, undo the nut, pry the seal out, bang the new one in with a big pipe or socket to spread the load and silicone sealant around it, then return the pinion nut to its exact position. If you get this right, you won't change the pinion depth and have to pull apart the rear end. Had to do this a few times on my own old '88 5.0, waybackwhen.
Lowered 2012 GT leaking pinion seal 
