I see some products are only for 99 to early 01s and some from mid 01s and up. How do I know which category I fit under with my 01 GT?

 

What products are you talking about??

 

here this site will show you which one yours is.. you can tell by the under drive pullies because they differ in the pre mid 2001's as opposed to the mid and up Stangs.

http://www.steeda.com/-techtips/modwaterpump.htm

 

Certain things like shifters and underdrive pulleys have different year specifications.

 

Thanks.
Ive got the mid 01 and later version!

 

for the pullies what you need to be concerned about is the waterpump. One is concave and the other convex. the only other thing that should be different is of course the shifter because ford switched transmissions that year. This is what steeda says about the water pump thing
"Mid-way through the production run for the 2001 model year Ford changed the design of the water pump on the 4.6L engine. The older style pump produced from 1996 to mid 2001 had a longer shaft. In January of 2001 the design of the pump was changed to a shorter shaft. This necessitated a change in the design of the pump pulley.




The old water pump pulley had a convex or "bowed-out" face, the new design has a concave or pressed in face. There is no exact changeover date for the pump and pulley. It is important to visually inspect your car to see which design you have. Supposedly the changeover occurred in January of 2001, but we have seen cars with identical January build dates and different water pumps and pulleys. "

hope this helps

 

whoops i hould have read the whole post on that one!! anwsered a bit late.

 

Ya, besides the water pump thing the tranny change was a big one, from the T-45 to the ever so popular Tremec 3650! If you've noticed any grinding in your shifts your car can be serviced under a TSB that came out in the summer. A lot of people have had trouble with that tranny. So far the TSB applies only to 01 1/2 - 03, 04 is excluded! Ya for me! So just a heads up on that one!

 

thats good to know, now i have to go home and check.

 

and to add to this if you are out of warranty you are SOL...like me

 

i just checked mine and i have the old one. is the new one better or is it just a different design.