if you are having fluid puking issues which I've chased as well on T56 Magnums... you have 1 of 2 problems. The shifter rubber boot on the underside (in the trans) could be damaged. Or the factory rear output shaft seal that came with them needs to be changed out.
check the shifter 1st... then try the next option.
Lastly you need to RTV the mechanical speedo block off plug in place and bolt it in too (not the rubber shipping temporary one that comes with it).
It's frustrating but that should tackle it.
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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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