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 part # 2460-1 ceramic coated;
Hooker Super Competition high flow cat-back exhaust system, 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

 

What RPM band is your cam good for?
If the RPM band has your car making hp at 5k+, then get something like 3:23's. If your car is making optimal power below 5k, then go w/ something like 3:73's or 410's. Since you only have a 4spd tranny, I would go w/ the 373's as you will loose a LOT of wind up-top w/ 410's.
Just my opinion

EDIT: Just noticed your rpm-band next to your cam specs; I would DEFFENINTLY go with 373's to 323's.

 

is it stock 700 gearing?
and how big are your wheel/tires because that matters

With a 245/50/16, and 3.73's and shifting at around 5500 im having to shift into OD right about the 1/4 mile mark. Its been a while since ive driven the beast so i forget exactly what speed im at when shifting into OD.

Generally 3.73's with the 700 are considered a bit overkill so i doubt youd want to go bigger then that.

 

Ya, I was leaning towards the 3:23's, but left the 3:73's open as an option. Not a very wise one though...

 

you have to remember this is a 400 small block that could easily be pulling to 7000 rpms. I still think 4.11's would definitly definitly be overkill. If its a stupidly high powerband maybe youd want 4.11's to get you out of the hole. Also depends is this a drag car where you want to be topping out 3rd right as you cross the 1/4? or is streetability more important.

If you want that expert advice try www.thirdgen.org/techbb2

 

400's pull high rpm's?? I never knew that...
But here is this dudes cam specs:
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
That is why I am recomending the 3:23's or 3:73's. And even 411's if you wanna top out at 120 or so

 

any motor pulls whatever you want it to. All depends on what cam intake heads hes using and i didnt really pay any attention to the motor cause other then powerband it doesnt matter.

If youre going to be shifting at 6500 3.73's are the way to go, with my 350 the 3.73's i have to **** into OD right at the end of the 1/4 so if youre gonna pull a bit higher rpms they should be just fine. You dont need 4.11's with a 700

 

Thanks for all the input, today I ordered in a group purchase my Strange w/ Super Posi rearend with the 3:73 gears.
You can look at my dyno sheets to see how the engine pulled throughout the RPM range. 6500 and still going.....
http://community.webshots.com/user/dtl504

Plus I still have to do some more tuning, so a little more power will be revealed..

 

Wow man, those are some GREAT numbers