When you want to drive fast whit a high powered engine a 3.77 ratio is good.
Engine's whit a lot of Hp the torque come's in whit 2000-6000 rpm.but are needed to come to the high speed .
Whit the high gear ratio , it's not relax to stop and go into a traffic jam.

When you choice is a lower HP engine you cannot drive's it really faster than 250km/h

1/2 hour of traffic jam is not unusual in my country.
Simon
I have the 3.77 gearing and I have not experienced any trouble at any speed in any gear and in any kind of traffic. I use my Pantera a lot and twice to France (from Denmark). Tell me what I should look for of problems..... I should mention I have a 393" stroker now but with my standard 351c I did not experience any problems either ever!

I can only recommend it and I usually only shift up to 3rd or 4th on country roads (80km/h) and 5th is a blessing on the highway and keeps the rpm's down to about 3000 at 150km/h
I have the Ford 400 stroked 434. I had mind changed to a 3.44. It is a joy to drive. Ive got 434ftlbs of tq at 2000 rpm so i needed to drop the rpm.

Before, 1st gear was absolutly useless. 60mph was way too much rpm.

Now 1st is in a perfect range and 60mph is is just a little over 2000rpm. Perfect range for this engine.
The worries are overblown, I have had 5.38's in a hot rod truck, 4.11's to higher gears like the 3.44 mentioned, my car weighs 2800 pounds, the difference between this gear and the stock is I shift after I exit the intersection instead of have way through it. I REALLY like it!! I also have a 393 stroker 285x35x18 that's 25.9" in diameter so my original back tire was a 305x50x15 27" in diameter, i" taller.
Appr. 12% difference. Your gearbox should have a data plate with all informations. Otherwise you have to open the bottom plate and count the teeth of the ring an pinion. Number of teeth of the ring divided by the number of teeth of the pinion gives you the ratio.
At Zf direct the ring and pinion is about 3800 euro.
We do a new 4.0 ring and pinion wich is about 50% stronger than the original.
I collect the orders right now.
It is developed by a technical master with have done some transmissions for verry big companies.

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