I'm about to buy a Strange 12 Bolt Rearend for my 84 Camaro. I need help on decieding which would be the best gears (Strange or Motive) and what gear ratio should I go with?
I have tried the online calculators and still is confuse whats best for my car, so im going to rely on ya'll experince and professionalism to guide me in the right direction. I was thinking the 3:73, but has considered the 4:11

Here is the combo:
My SBC 409

Engine Block: 400 SBC ID# 330817/14y139664/ T0508CSU
(4.125 bore X 3.750 stroke) after .040 bore (4.165 bore x 3.75 stroke =409)
Deck Plate Bored, Mains Align Honed, Block Deck .002, Deck Plug Holes & Tap w/3/16 Holes, Starter Bolt Drilled, Front Three Gallery Plugs Tap for ¼ Pipe Plugs.

Crank: Scat 4340 Crank 3.750 6.00, Internally Balance, Part# 4-400-3750-6000

Bearing: Clevite– MS1038H Mains and CB663H Rods

Piston: Wiseco Pistons, .040 over, 5.4cc; 430 grams, Part# PT020H4

Rods: Eagle ESP 4340 H-Rods 6.0, Part# CRS6000B3D

Block: Deck: 0.002

Compression Ratio: Static-10:44 Dynamic-8:27

Cam: Grind: Solid Lunati
280/284F10 .525/.530 Lift, 247/251@.050, 159/162 at .200, .500/ 504 valve lift, 2500-7000 RPM, Installed Straight up, .026" Valve Lash Hot, .022

Valve Springs: Lunati Part#73124 130 Seat 330 Open.

Heads: AFR 195 Part# 1035 w/23º valve angle, 74cc, drilled steam holes.

Head Gasket: Fel-Pro-1014 / .039 in. compressed thickness, 4.200 in. bore, 9.0 cc compressed volume

Intake: Edelbrock RPM #7101

Carb: Speed Demon 750 Mechnical

Rear End Gear: 3:73

Transmission: Pro-Built Street/Strip 700R4

Stall Converter: A.C.T. 3000 Stall

Exhaust:
Hooker Super Comp headers 1 5/8 Headers Intermediate pipe: 3 in.

* Tail pipe diameter: 2 1/2 in.

* Dual tail pipes out the rear under the bumper
26" tall tires
Weight: 3400lbs

I just swapped a set of 3.70 gears for a 4.11 set up. I have a T400 trans. I was looking to make the car a little more strip than street. Your overdrive trans will be to your advantage for use on the street with either 3.70 or 4.11 gearing. What is the intended use of the car? If it's gonna spend more time on the street I would go with the 3.70 gear set for sure. The 26" tall tire could be swapped for a taller tire to fine tune / adjust final set up with your gear choice. For a street/strip ride think about a 3.70 gear and a 28'' tall tire. As far as brand of gears, if I was going with a Strange rear end I would keep it all Strange. My ride rarely sees the interstate, and then only for about a 20 mile run. I run around 3000 rpm and EVERYONE blows by me on the highway. I can say as to putting power down on the street........any more gear than a 3.70 is kind of a moot point, cause if your making any kind of power you will just go up in smoke. On the up side, there is much value in burnouts from a 35 mph roll along side some hooples throwing revs at you!:)

Be careful with the 700R4, that really makes a difference in your gear choice because of the deep 3.06:1 first gear. It's real easy to give it too much gear, and if you're making alot of torque, you'll have a hard time getting it to hook. All in my opinion, of course.

For example, a 3.55 gear with a 700R4 has the same first gear ratio as a 4.30 with a TH350. With 3.73s, that's like a 4.53 gear with a TH350.

With 3.73s or 4.11's, you have a real possibility of shifting before you hit the 60' mark.

Thanks for the help, by locking up the convertor should eliminate the shifting in 1st gear before the 60'. I will be going with the Strange 12 Bolt, Strange 3:73 Gears and rear disc brakes 12" rotor.