I had a GForce GSR dog box in a race car and it has no business being on the street. The sheer whine is for a race environment only. It shifts instantly and is one bad mofo with a zillion gear ratio options. Another plus is that they are around 60lbs..... saving an easy 70lbs from swapping away from a T56.... and then another 20-30lbs with running a lightweight 7.25" triple disc clutch/PP/flywheel setup (mine was 13lbs total).
Once again... this transmission is not a street transmission by any definition. Straight cut gears and dogs for gear engagement are brutal on the senses over time.
The 4 speed dog boxes are affordable. The 5 speeds which are yet again a step up with little compromise in gearing... are super $$$'s.
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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....
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