#K400L4. Fits all GM TH400 transmissions 1965 up. This Combo Kit comes with all of the parts we use in our level 4 400 Mega Raptor transmission. You can buy other small parts and a torque converter at the same 10% discount rate. You get a high performance Fairbanks TransAction Shift Kit, a 36 element oversize sprag and drum with 4 times the holding power of the stock 16 element sprag, the front intermediate band is replaced with a wider 4L80E black carbon fiber band, an Alto Red Eagle master rebuild kit with red clutches, Kolene steels and all three Power Packs – – forward – – intermediate and direct, plus a free PATC shirt. Plus you get a hardened Billet steel input shaft, drum and the billet forward clutch hub comes with bearings. You also get the oversize center support with a larger intermediate piston that has 9% more holding force, a center support brace to prevent case lug blow- out, and the intermediate shaft is made from 300 Maraging steel to prevent breakage. This combination is good for motors with 1200 horse power or someone that just wants the best of everything. There’s a 10% discount on this level 4 TH400 Combo Kit.