The 6 speed is very strong Rob. Again the gearstacks and rear case are the same as the Evo MR 6 speed and they seem to hold up to about 600-700awhp in a big heavy full interior evo before they start to break teeth on 3rd or 4th gear. 1st and 2nd gear are absolutely massive. In our lighter cars they should hold up to 700-800whp for quite some time.
Also wheel hop is a killer for the teeth on the 6 speed boxes. High hp evos running on street tires will wheel hop like a mother on the strip if not driven properly or without proper suspension. The 700awhp evo that i raced in my vids actually wheel hopped on his last run hitting 2nd too quick and chipped a tooth on 2nd gear and had some whining in 2nd. But the rest of his gears held up to the 7-8 runs he did that night.
Anyways its worked great for me soo far. That mixed with the 85w140 valvoline gear oil. Ive done some pretty hard quick shifts on the street with it even hit 5th hard and then just lit the tires up in 5th pounding the rev limiter when i was testing out 35psi on the t67 h.o. Took it no problem. That and all the tuning runs on the street on slicks probably for about 4-5 hours straight before i went to the track. Then the 8 runs i had at the track, 1.61 60ft, Getting tire shake in every gear from the slicks trying to rip loose.
The 6 speed is the ultimate way to go in the end but it does cost some money to completely do the swap. Shep also has a billet 3-5 gear option that soo far has proven itself in their 850awhp drag car and a 550awhp road course car. A cheap alternative that will hold even more.
Again try the 85w140 Valvoline man and I can almost gurantee you the b13/b14 box will last much longer than your last boxes. It wont be bullet proof or anything but you will notice the difference in shift quality and cusioning of the gears.
Also wheel hop is a killer for the teeth on the 6 speed boxes. High hp evos running on street tires will wheel hop like a mother on the strip if not driven properly or without proper suspension. The 700awhp evo that i raced in my vids actually wheel hopped on his last run hitting 2nd too quick and chipped a tooth on 2nd gear and had some whining in 2nd. But the rest of his gears held up to the 7-8 runs he did that night.
Anyways its worked great for me soo far. That mixed with the 85w140 valvoline gear oil. Ive done some pretty hard quick shifts on the street with it even hit 5th hard and then just lit the tires up in 5th pounding the rev limiter when i was testing out 35psi on the t67 h.o. Took it no problem. That and all the tuning runs on the street on slicks probably for about 4-5 hours straight before i went to the track. Then the 8 runs i had at the track, 1.61 60ft, Getting tire shake in every gear from the slicks trying to rip loose.
The 6 speed is the ultimate way to go in the end but it does cost some money to completely do the swap. Shep also has a billet 3-5 gear option that soo far has proven itself in their 850awhp drag car and a 550awhp road course car. A cheap alternative that will hold even more.
Again try the 85w140 Valvoline man and I can almost gurantee you the b13/b14 box will last much longer than your last boxes. It wont be bullet proof or anything but you will notice the difference in shift quality and cusioning of the gears.
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Originally Posted by SE-Rican 
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