I already have one and installed but just saw this on v6 mistang stuff Most V6 Mustangs with the 7.5 inch rear end never came stock with a T-lok (limited slip differential) which allows both wheels to have power to the ground. Usually only one wheel, the right-rear wheel has the power. Upgrading to a T-lok is one of the best modifications you could ever do.

It says most did not come with one. What does that mean? was there a certain build date they stopped putting it in? could help someone trying to get one

From what I know, I dont think any sixers came with a tlok. I know I will be getting one soon.

No V6 comes with an LSD. It's a good upgrade, I would definitely get one.

When you update gears and add T-LOK are these two separate parts or do the gears if you order T-LOK come together as one part? And how many more RPM's do you turn if you upgrade to a 3:73 rear end gear.

ORIGINAL: bztz4m

When you update gears and add T-LOK are these two separate parts or do the gears if you order T-LOK come together as one part? And how many more RPM's do you turn if you upgrade to a 3:73 rear end gear.


The ring and pinion gears are ordered separately from the LSD. T-loc is a spring/clutch type Limited Slip Differential and you also might want to look into a Detroit TrueTrac which is a gear type LSD. As for the RPM's; at what speed are you talking about?

I looking for an overall RPM increase at driving in the city and hwy at 65 mph.

3.73 gears you average about 300-500 more Rpms. 1st gear will pull to 20 mph instead of 25 mph, 2nd goes to 30-35 mph instead of 40 mph. Top end cruising at 80 mph you are turning right under 3000 rpms.

Thanks again for the info.

ORIGINAL: pat6674u

3.73 gears you average about 300-500 more Rpms. 1st gear will pull to 20 mph instead of 25 mph, 2nd goes to 30-35 mph instead of 40 mph. Top end cruising at 80 mph you are turning right under 3000 rpms.


Do you have the manual or the auto?

would you happpen to know what speed you go at 5,000rpm in 5th with 3.73's?

I actually should revise my numbers a bit. Yesterday I took a good look at my rpms and on the freeway at 90 mph I was turning 3000 rpms. There is no reason for me to find out how fast I'm going at 5000 rpms in 5th gear. I was surprised the freeway was clear enough yesterday to let me go 90. Also, we make most of our power in this car between 2500-4000 RPMs. Given that, here are the shift points I came up with in my manual V6

1st gear 20-25 MPH
2nd gear 40
3rd gear 60
4th gear around 80
5th cruisin'

I'm no mechanic but that is just regular driving on my car. I could probablt push all those gears more but its probably not worth it.