hotrodstang

Thank you all for the great feedback, I have been on other forums (non-Mustang), and I have to say I have never had so many replies to a post this quickly, you guys rock!

SINISTER

Yeah, we know. [8D]

Kwolfe71

3.90's are great for a regular daily driver...that's what I have and I'm very pleased with them. Don't have much use for 1st gear though.

GhostRider02GT

just throw a t56 tranny in and call it a day

mustangman03

I got 373s and i get real good gas mileage on the highway running about 75-80 im turning about 2000 rpms. what are you turning with the 430s because i have about a 30 mile drive oneway to work.

USMCrebel

4.30's should put you much about 2200rpm-2300rpm

SINISTER

75 mph is right around 2500 rpm if I remember correctly, and 80 is right around 2,800 rpm. I usually cruise around 60 mph though, and only turn about 2,000 rpm at that speed.
However, on the road trip I went on where I got 22 mph, I was cruising right around 80 mph the whole time.

oxfordgt

I have 4.10s in my built, full bolt on, full suspension, drag radial wearing 04 gt and my only regret is that I didn't get 4.30s. I launch at 3200 rpms and have no tire spin.

mustangman03

I launch at 2000 and i spin like crazy and i got 3.73 however i went to al about a 5 hr drive and i stayed at 80-85 and i got 27 mpg when i put some of the amsoil fuel system cleaner in i generally get 25 mpg highway & 17 city sometimes.

Eagle2000GT

+1 mustangman, are you sure you have 3.73s? Did you recalibrate your speedometer when they were installed? The previous owner put in 3.73s on my car and took out his handheld when he traded the car so my speedometer was off. Now that the speedometer is right I'm running 2200-2300 rpm at 70 and around 2500 at 75. The tach doesn't read a lot of difference in fifth. The next time your on the highway drop down to fourth and get up to 80. With 3.73s the tach should be dead on 3900 rpm. I believe it 3400 for 3.27s.