FJBen
SILVER Star
My fabricator finished the 3" exhaust and skid plate yesterday morning.
After buttoning up a few items, I took it for a shakedown run out to the lake. I put about 60 miles of mixed driving on it and I'm getting a LOT of gear whine at highway speeds. I'm not sure if it's the H55F, the 1.1:1/4:1 split t-case gears, or the 4.56 diff gears. It's loud AF. Spinning about 2,500 RPM at 55mph.
After the shakedown run, I have a few items I need to address:
The valve cover gasket is leaking. I installed a brand new gasket when I powder coated the valve cover. For now I am just going to snug it down and see if it will stop. If not, I'll pull the cover and try to re-seal it with some Gasgacinch.
I just vented the gas tank through the fuel separator and out the cab to atmosphere near the rear tire. On really steep grades when the tank is full, it will dump fuel out the breather line. I might route it somewhere up high to prevent dumping fuel while 'wheeling.
Finally, the Sniper is making a high-pitched whine. I think it's the fuel pressure regulator on the Sniper. Since I'm running a separate GM fuel regulator/filter, I just capped the regulator/return on the Sniper. You can really hear it at the end of the video when the engine shuts down.
If I had to guess, it’s those 4 to 1 tcase gears. Those are notorious especially at first for being loud and having whine. Add to the fact you have zero insulation in a 40, it’s loud.