cummins cowboy

the topic says it all, I have heard mention of 3.31's and 3.55's in 5 speed mustangs, I am wondering how can you tell what the car has if you are looking at buying a used one.

rford426

Mine has 355s but some have 331 i think there is a tag or a sticker on the diff. if i remember correctly

Art161

Yes, there should be a sticker on the differential. Another way to tell is from the label on the door jamb, if you can figure it out.

For example, the Workshop Manual for 2007 says:

BG--3.31--non-limited slip, base vehicle with manual or automatic transmission

CD--3.55--limited slip, GT with manual transmission

CG--3.31--limited slip, GT with automatic transmission

All wonderful, except I think that in 2007 the standard ratio for the GT with manual transmission was 3.31, and the 3.55 was an option. But the Workshop Manual doesn't show the code for the manual transmission standard ratio. I don't know what the codes are for other years.

S197GT07

My 07 has the CG code, and its a 5-speed

Murphdog

yes 3.31 was the standard, 3.55 was the option

Nuke

^ +1

cummins cowboy

why would anyone want a mustang with no LSD, without it, you have one wheel peel. I thought all these cars came with that, looks like another thing I need to look for when buying a used mustang,

where is the sticker on the differential??

and if it has 3.55's is that guarantee LSD??

how much is it to add LSD if the car did not come with it?

wolfie

I believe all GT's have LSD

nmd55

+1 on the sticker on the rear diff. you can see it in this pic

cummins cowboy

do they all have LSD?!?!?

I just drove an '07 with 3.31's IMO that is the wrong friggen gear for the car!!! I took it up to about 80 and never left 3rd gear, its like what are the other 2 gears for.

I think this car had axle code CG, and I verified it was 3.31 on the diff cover