I might add the prop valve down the road but I tried like hell to get the rears to lock without luck, swung it around some wet pavement and hammered them thinking the back would fish tail on around the front but it didn't.
I'll be on some loose gravel next weekend and will experiment then but after reading dozens of threads with guys running up to 37's I have yet to see one that didn't do the valve have problems with the rear locking up.
Mine did some diving before, not much but now it does none. My LSPV was leaking badly and when I did my longfields I didn't reinstall the tone rings from my old birfs so my ABS was useless anyhow.
When it did work it worked at times when I didn't need or want it to work, wash board roads, gravel roads, hell even some smooth dirt roads would set it off, the only time it somewhat "behaved" was on dry pavement, I can probably blame that on a bad wheel sensor.
Anyhow I'm quite happy to have some space back in the engine compartment, possibly room for a compressor now!