I have a ls2 402 with a 6 speed and 4.10s.My car ets around 10.6 to 10.8 at 129.xx
My question is does anybody have a before and after mph comparison going from a six speed to a th400?I want to find out how mph I will loose with a th400.I know I will et better but I also street race alot from a roll so that mph is important.Also do you think 3.73s would be better for a th400?

 

anybody?

 

I know someone (I have no personal experience) that switched from a M6 to TH400 and lost 4 MPH if thats any help.

 

I stayed even going from an M6 to a TH350 if that helps.

 

Sweet! everything else was the same except tranny?

Dan

 

Also went from a 26" tire to a 28" tire. In theory I should have lost MPH.

 

Great info.I also heard a glide is even more efficient.

 

Yeah, I'd say you have a pretty effecient TC in there. I have seen people go the other route A4-M6 and gain some decent MPH.

 

It's a custom converter. I only lost ~32 RWHP on the dyno over the M6. It is efficient.