i have a g52 and it's forward shift. i'm pretty sure you need the top shift case from a 22re tranny. or at least thats what marlin told me when i talked to him about doing dual cases on my truck.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.