robbie21mma

im looking to buy a new mustang gt07' or 08' the thing is i want to put a procharger or some other supercharger on it and full exhaust, heres the catch i dont want a standard shift i want a automatic so my question is how much power will the auto transmission hold? does anyone know about the auto transmission in the new mustang and how reliable it iswith a power adder?

hammeron

welcome to the forum.....i would post this
question in the 4.6L V8 specific area, there's
alot more traffic there....

zkiller

The auto tranny (5R55S) is a good tranny. It does have a tendency to fail under forced induction. Most people are losing third gear. That is what happened to my tranny after 3000 miles with supercharger. I was at 10 PSI
I now have a built automatic tranny by level 10 and it had held up perfectly for 7000 miles of hard driving and 1/4 mile runs. I am running 11 PSI now. The tranny I have has stronger nands, clutches etc to hold 800 RWHP.
Some trannies dont fail but I know of at least twenty that have failed after forced induction.

s197richie

IDK what company, TCI maybe, is advertising a 5r555 auto that can take about 800hp worth of abuse. They're advertised in the MMFF mags.

ps the cast engine internals and 2 pc ds may have some objections about your FI...you've got more to consider than the slushbox snapping