September 16, 2010
5.13...the main thing to remember is the higher the number the weaker the pinion b/c the it becomes more and more narrow.
I`ve got 4.88`s with 41" Super Swampers, and It works Great! I kept the number low b/c I do a lot of highway driving.
In your case, 37`s, I personally would go with 4:56 if you will be doing more highway driving. 4.88`s will do great too. I know that there are a few gear ratio websites out there to help people calculate the best gear ratio automatically!
5.13 is too high in my opinion.
My RICHMONDS are class 7 racing quality for the baja 1000k trucks with the 8.8 rear end...I LOVE MY RICHMONDS. I also went with an Auburn LSD/Posi b/c it`s stiffer than the slippery stock LSD and works AMAZING on the trail, virtually no slippage on the rocks and no "chirping" on the pavement/asphalt!
My first gears were PG Gears...CRAP...they literally just turned to mush.
My Second gears were PG Gears...don`t ask why I go them again, DAMN.
My Third gears were RICHMONDS...I stripped the gears b/c I was in an emergency rush and applied the gas before I put the truck in drive :/ ...the rear end jumped off the ground then the gears stripped.
My fourth gears are RICHMONDS...and I installed both RICHMONDS myself, and my Second Auburn myself also. The first Auburn burnt the clutch plates b/c I was an IDIOT and forgot to put in the gear oil additive that comes with the gears...foolishness.
I hope I helped...all in all, if you install properly, with good maintenance they will last forever!! I HIGHLY recommend SWEPCO 210 Gear oil with the LSD oil additive, it`s EXPENSIVE...but my auburn is absolute heaven with this oil choice!
"I`m at the point where nothing short of my best shot at righteous existence will do. The ramifications of a slip are not what they used to be. It`s not kid stuff anymore."-Robert Downey Jr.