I have a 77 Arrow GT with a Direct-><-Connection LSD
and I'm woundering what gears came stock as well as optional through
the dealer as well as after market?
Question I have is, my rear gear seem really tall, and the motor Revs really high while on the Highway?
I think I have a 3:54?

3.9 to 1 with 1600cc with 4-speed, 3.545 with 1600cc automatic and 3.90 to 1 with 2000cc with 5-speed; 4.22 with 1600 and 5-speed; 3.55 to 1 with 2000cc and automatic.

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4.22 holycow!
If this is right I should have a 3.90rear?

How do I go about finding out my ratio with out cracking open my pumpkin?

If you have a 3.90, 4000rpm in 4th gear should be right at 70-72mph. Try that first. If your RPMs at 70mph are lower, you have a lower number diff ratio, higher RPM, higher number ratio.

My arrow was a 2000 5sp maual, so should be a 3:90 if joes right.
But the Original owner (2 people before me) had a LSD instaled at the dealer when purchesed, but i'm not sure of the gearing?

I thought there was a math-matic way to spin the wheel 1 rotation and count the drive shaft rotations then us that math stuff to figure it out?

Yes, there is. It's just never worked for me.

The 70mph test is easier...

You can also get gears off a sapporo rear end assuming yours is still a 180mm Give you the option of a 3.3 if you can find it

if you get hard core enough to look inside

3.54 has a 39 tooth ring with a 11 tooth pinion
3.90 has a 43 tooth ring with a 11 tooth pinion
4.22 has a 38 tooth ring with a 9 tooh pinion

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31 3000gt vr4
88 starion x2, 83 starion
88 cordia turbo
87 Montero swb turbo, 1987 Minicab van Supercharged
86 mighty max 4x4
84, 85, and 86 lancer ex1800 turbo
78 lancer
73 galant coupe
65 Debonair Deluxe
80's Hero