So I see that they supply a rear cross member, I would be checking that this kit does not lower the rear of the trans to get there. I bought a A41 from keisler way back when and it was also called a perfect fit, lowered the rear of the trans by about 1.5" which makes for a lot of driveline vibration. I have one of the first 855's and could not be happier. Just Sayin

1967 GTX 572 HEMI 735 HP, 717 FT Lb T, , A-855 5 Speed, Dana 60 4:30 Gears, 30" Rear Tires