If any one knows which is better to get, the upshift valve made by gm for the police cars or the b&m down shift valve. Also if you could tell me the difference. From what I understand the B&M will move the downshift to 3/4 throttle and the gm upshift valve will let you cruse in OD at full throttle. I don't know if this is correct or if they are the same part (in the valve body).

If you can help me I would appreciate it.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,Edelbrock ported centerbolt heads,LT1 24# injectors,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler,MSD 6A, accell coil, bosch platnum plugs, this car is currently under rebuild and restoration.