That chart is not complete fwiw but it may just be addressing earlier front engine/rear drive applications. Late model Camaro SS w/6-spd have a 3.01 first gear ratio and most newer Z06/ZR1 Corvettes w/6-spd or 7-spd have a 2.29 first gear - not sure about the newer Ford offerings. I have a G-Force Street T56 with 2.71/1.79/1.30/1.00/0.89/0.75 ratios and my rear gear is 3.55.Figure out what gears you have in your trans, what tire size you have, then use this calculator to help you determine which gears to go with. It's not just the rear gears, it's your tire height that plays in to the final drive ratio.
I have a "high" revving LS motor, have 3.73s and currently running 25" tall tires. Got stupid lucky with a trans from an 05 GTO, (TUET2066), 0.56 6th gear. I can throw it into 6th at 40mph and it's happy all day long, 2k rpm @ 70mph.
Here's the different T56 gear ratios over the years:
Late model Camaro/vette run TR6060 transmission.That chart is not complete fwiw but it may just be addressing earlier front engine/rear drive applications. Late model Camaro SS w/6-spd have a 3.01 first gear ratio and most newer Z06/ZR1 Corvettes w/6-spd or 7-spd have a 2.29 first gear - not sure about the newer Ford offerings. I have a G-Force Street T56 with 2.71/1.79/1.30/1.00/0.89/0.75 ratios and my rear gear is 3.55.
Sorry, my bad! I tend to lump them all into the same category as they are an updated/newer version of the T56. My G-Force T56 has a newer T56 Magnum case and extension housing but the 9310 alloy main shaft retains a Viper 30-spline output shaft (as opposed to the Magnum 31-spline) configuration. Triple cone synchronizers through out. Does that make it a "Frankenstein T56"?Late model Camaro/vette run TR6060 transmission.
this is what mine will be for. I am working for a good highway cruise and figure all the rest of the gears will work out from there. My whole town is 25 mph with 3 35 mph streets only thing higher is going to wally world we have 55, So if i never use 6th here that will be good and 6th for out on the interstate.I have 3.42s with a close ratio T56 Magnum. If you do the calcs, back in the day a good combination was a close ratio muncie with 4:11 gears, so 4.11 x 2.20 = 9.042:1 for an overall first gear ratio. Or a wide ratio muncie with 3.55 gears so 3.55 x 2.56 = 9.088:1 for an overall first gear ratio. With a close ratio T56 the calc goes 3.42 x 2.66 = 9.092:1 for an overall first gear ratio. That keeps the lower gears more usable.
At 1900 rpms in 6th with a 26.67 tire I'll be running right at 70 mph so that's a good rpm for cruising. Also, if I can get it to hook up, I should be able to be close to top end for 4th gear through the 1/4 mile.
Lastly by using the 3.42 gears you keep the driveshaft RPMs down to reduce the chance of hitting the critical speed for the driveshaft.
It depends on what you're going to use the car for, engine configuration, etc. Mine goal is a good road car, with some autocrossing, and a drag race every now and then. I am still building my car so this all theory, but the math works. My target for the engine is 900hp at the crank from an LS based 396 that has a positive displacement supercharger.
Use the tremec calculator and it'll give you some ideas.