Tr-6060 z-51?
12-13-2013, 07:00 PM
#1
Pro
Thread Starter
Tr-6060 z-51?
Hey all! I am wondering if anyone knows why the TR-6060 in the 2008 Z-51 cars are rated at 428 ft-lbs and the standard/zo6 TR6060's are rated at 500 ft-lbs? The LS3 stock would be on the edge in a Z-51 and the LS7 in Z06 trim would be too. A few mods in my 08 Z-51 puts down 411hp/411tq, which at the crank would be well over the 428 ft-lb rating. How does this make any sense? Did GM build the trannies to hold only stock power levels reliably? Does anyone know why the rating is less in the z-51 cars? Thanks!
12-14-2013, 09:45 PM
#3
Burning Brakes
27 spline output shaft in the base and Z51, the Z06, GS and ZR1 have the 30 spline. Many cars have doubled that advertised power rating.
12-14-2013, 10:44 PM
#4
Pro
Thread Starter
Yup, I have seen that before. It still doesn't make sense the base/zo6 is rated higher. I believe only the Z06's have the 30 spline output shaft, so something else must be different in the Z-51 tranny? Is it just the taller gearing cant handle the torque as well? Hoping an expert chimes in!
12-14-2013, 11:24 PM
#5
Burning Brakes
Base and Z06 have same gear ratios, Z51 has shorter gears & ZR1 has tallest so best guess is that it's based off of that. What are you trying to do with the car? Stock ZR1 transmissions see over 1000rwhp, so I wouldn't worry if you're going to make more than the advertised figures they post.
12-15-2013, 10:36 AM
#6
Burning Brakes
Hey all! I am wondering if anyone knows why the TR-6060 in the 2008 Z-51 cars are rated at 428 ft-lbs and the standard/zo6 TR6060's are rated at 500 ft-lbs? The LS3 stock would be on the edge in a Z-51 and the LS7 in Z06 trim would be too. A few mods in my 08 Z-51 puts down 411hp/411tq, which at the crank would be well over the 428 ft-lb rating. How does this make any sense? Did GM build the trannies to hold only stock power levels reliably? Does anyone know why the rating is less in the z-51 cars? Thanks!
I have about 614 at crank 570rwt have seen no problems. I don"t get on it that often. But when I do have had no issues. sent fluids to blackstone, some metal in fluids but it was bought new. and said it was from build most likely well within limits
12-15-2013, 12:16 PM
#7
Pro
Thread Starter
Base and Z06 have same gear ratios, Z51 has shorter gears & ZR1 has tallest so best guess is that it's based off of that. What are you trying to do with the car? Stock ZR1 transmissions see over 1000rwhp, so I wouldn't worry if you're going to make more than the advertised figures they post.
12-15-2013, 01:50 PM
#8
Burning Brakes
Lots of good info here. Only thing that makes sense based on what's been presented here is that if the base and Z51/GS have the same 27 spline shaft but different Tq ratings, it has to be a function of the lower ratio (higher numerically) 1-2-3 gear sets. Ratio in 4th (1.00) is the same across all models.