Join Date: Jul 2013
Location: New Hartford, CT
I was just about to start a new post on a very similar topic, so your timing is perfect. Details of my drag only car are in my sig. Everyone keeps telling me (and I don't doubt that it's good advise) that I could pick up a couple tenths if I got rid of my T56 and replaced it with a Gforce or Astro T5. As it so happens, I still have the T5 that was in the V6 99 coupe that I used for the basis of my car, which also has a 03 4V Mach 1 crate motor, essentially stock except for some intake work and Kooks long tubes. So I have toyed with the idea of doing exactly what you have in mind, but never did any legitimate research, as it appears maybe you have. So a couple questions from someone who knows little about transmissions. Never had one apart.
1. What will you be using for a bellhousing to mate up the T5 to the 4V ? And will it be SFI?
2. What year and model T5 are you using for the build. I know that there are different length tail shafts etc.
3. How many spline is the input shaft on the kit?
4. How does the price the kit, sending gears out to be faceplates etc compare to just buying an A5 or GForce T5 ?
I guess all of these issues have been what have prevented me from giving this the research time it deserves, along with the very important issue of $$$ per ET. So when I start thinking about putting 2500-3500 into a new tranny for a couple tenths, then the little accountant on my shoulder says for double that, say 6000 or so, I go Procharger to pick up a full second, minimum, and the T56 might be a better choice for that kind of power. Can kinda drive you crazy after a while.
99 coupe. C4/8Ē 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.