Miata+4g63+T56=awesomeness!

**asshanson** · 09-19-2010

Don't use the 04/05 CTS-V rear diff, the case is not strong. The 06/07 is a bit stronger though. Maybe you're talking about an 09+ rear diff, but I imagine those are $2k+ and impossible to find used.

My T56 is holding 520wtq, and I know a few V guys are running at least 600wtq on them without any issues, never revving past 6500-7000rpms though. I bet the Viper guys spin them faster, but the Viper spec ones are pretty spendy. Maybe slowbubblecar can chime in on those.

slowbubblecar · 09-19-2010

Quote:

Originally Posted by asshanson

My T56 is holding 520wtq, and I know a few V guys are running at least 600wtq on them without any issues, never revving past 6500-7000rpms though. I bet the Viper guys spin them faster, but the Viper spec ones are pretty spendy. Maybe slowbubblecar can chime in on those.

I haven't heard any tranny issues for people making less than 750 whp or so. The only people worried about trannies at the TT guys and some of the Paxton people that are making 800 whp+. Used trannies usually go for around $1,500.

The Viper T56 would likely be more than what would be needed in a miata with a 35R.