steverino

I have an '08 GT with automatic. Does anybody know the gear ratios of the automatic transmission? It seems to rev kinda high when I leave the gear shift in 3rd, so I'm thinking 3rd must not be 1.00:1. Am I correct in thinking the rear end is a 3.31:1 ratio? Thank you.

Argonaut

Check out this sticky: https://mustangforums.com/forum/4-6l-v8-technical-discussions/446207-gears-wheels-tires-revs-rpms-and-mphs.html

Different cars have different rear ratios, yours should say on the sticker inside the drivers side door frame or on the rear differential cover.

mustang2000GT

The axle code is written on the inside of the driver's door on the white label, it
will be a two-digit code of two letters.

Nuke

Here's the ratios for the 5R55S Auto in the S197's:

1st/2nd/3rd/4th/5th (OD) - 3.22/2.29/1.54/1.00/0.71

stealth_GT

you are correct it is 3.31 but I think they should have put 3.73s or made 3.90s as an option.They might as well put 2.81 gears because that's what they feel like lol.

Texotic

hey nuke, do you know the ratios for the manual?

Argonaut

Here is what it says in Wikipedia:
TR-3650 used in the 2001-present Ford Mustang GT

1st: 3.380:1
2nd: 2.000:1
3rd: 1.320:1
4th: 1.000:1
5th: 0.620:1

http://en.wikipedia.org/wiki/Tremec_...0_transmission

Nuke

The OP was looking for the automatic values.

My source says 0.675 for 5th on the Tremec 3650 manual. Don't know which one is correct.

sailing220

And some other guy asked about manuals...

Texotic

yeah, i was asking about the manuals. sorry for the confusion.