I've had a number of 8.8" rear ends built and only use Ford Motorsport gears as they are quiet. Richmond gears in the 3:90 ratio whined like crazy. I asked my differential guy about it and he said that is what particular brand in that ratio does. He has been working on transmissions and rear ends for 35 years.
So that being said.... what gears are you guys running in your 9" that don't whine. There are a dozen manufacturers and I don't want to make that mistake.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
Last edited by gnx7; 08-20-2012 at 03:02 PM.
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