Join Date: Jul 2006
Location: Northfield, Illinois
I have a GTA unit which is smaller than the AD GTAm unit in my GTA rear axle. It has held up just fine for years on the track behind my GTA engine in different (mild to radical) states of tune. It's disadvantage is it runs partially locked, (set-up-pre install) at all times, and makes turning the car (on-off trailer, or low speed driving) difficult. At speed, on the track, it's just fine and is trouble free.
The GTAm pawl type, is locked or unlocked, and more non-race friendly. I have similar, GTO locker type differential, in my 275 GTB. The "violence" of the lock-unlock cycle is overstated. It just requires a learning-curve, which includes a few interesting spins at speed. Once you know what to expect, it's just fine. I've had the 275 about 40 years, and both street or track combined, only swapped ends 3 or 4 times early on as I learned. It is NOT user friendly on a damp track with dry and wet spots, noticed or unnoticed.
A big advantage of the locker type is heat build up. A clutch type LS gets hotter. This is less an issue today with synthetic lubes, conventional mineral based lubes needed frequent changes on the clutch type.
I believe either type can absorb the power of a GTAm engine, it's a matter of ease of low speed, or off track use and heat. All the above is only my opinion from my own experiences over many years.
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