I currently have a stock 3.23 posi rear end. Would swapping in a 3.73 from an L69 give me some SOTP excitement (some engine mods: cam, intake, dual snorkel, carb-tweeking, DR secondary metering rods, etc)?

JamesC

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I went from 2:73's to 3:73's, i definitely felt a difference. It has some MAJOR get-up-and-go off the line. I don't recomend them if you want great gas milage though. Highway use is fun, but not what i would call economical. If i were to do it again...which i probably will, i would go with 3:42's. I must say though, i can still get 16 mpg if i don't lay into it very often

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• 89 Formula 305 WS6
  SFC's, LCA's, Air Foil
  Spohn Panhard Bar
  Flowmaster Cat Back, Tranny Cooler
  A/F Ratio Meter (not a mod but it sure spurs interest)
  Trans Temp Gauge
  Most "Free" Mods
  3:73, Zexel Torsion Posi
  Catco cat
  CAI W/ K&N
  
  15.559 @ 88 MPH
  (Not good enough)

 

I also went from 2.73 to 3.73 and the car took on a whole new personality. I wouldn't recommend it if you do any interstate driving and need to get up around 70-80mph. I have a set of 3.23s waiting to be installed when I can find time and someone who knows what they are doing.

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Mongoose-NCTGA-1990 Pontiac Formula/305 TBI-700R4 with Edelbrock Performer TBI intake,TES headers,and STB,K&N,MSD-6AL,Holley laser shot coil,Accel Extreme 9000 wires,Jet Stage 2 chip,TCI shift kit with corvette servo,Richmond 3.73 gear with Auburn 3 series posi,high flow cat,SLP 3" cat back,Eibach sportline springs,Energy Suspension poly throughout,Lakewood LCA and adjustable panhard bar package,SSM subframe connectors,IROC wonder bar,Tokico 5 way adjustable struts and shocks,Autometer electric fuel pressure gauge,Alpine,JL Audio,MB Quart,92 GTA taillights,92 GTA aero wing and hatch,Steve Spohn LCA relocater kit and torque arm,MacEwen White face gauges,84 T/A cold air induction air cleaner,Grant Formula GT wheel.

 

When you guys say you went from 3.23 to 3.73
gears

What all did you change..

? Axel, ring and pinon??


Thanks

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92 Camaro 305 TBI Automatic
2.5 high flow cat, 2.5 pipes, 3.5in tip
shift kit(Rebuilt Tranny)
Tinted windows(legal)
Spark plug wires and plugs...
14X3 O.E. K&N Filter
Edelbrock TES 1 3/4" Headers
Future mods?
any other advise on getting to 300+ HP would be appreciated. Thanks

11.0 Et @64mph on the 1/8 reaction time was 1.0+ with a 60ft at 2.5?(First run ever, didn't know which light to go on)
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System = Sony explode 5000 CD/MD receiver
Rockford 6x9 Fanatics
Rockford 4x6 Fanatics
Rockford 2 12" Hx2's
Rockford 1 farad cap
Rockford 800x2 Amp
Custom box
4gauge wire kit


https://www.thirdgen.org/rides/index.tgo?action=view&rideid=6100

 

ttt

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92 Camaro 305 TBI Automatic
2.5 high flow cat, 2.5 pipes, 3.5in tip
shift kit(Rebuilt Tranny)
Tinted windows(legal)
Spark plug wires and plugs...
14X3 O.E. K&N Filter
Edelbrock TES 1 3/4" Headers
Future mods?
Cam, Reworked heads, Chip, Hood...
any other advise on getting to 300+ HP would be appreciated. Thanks

11.0 Et @64mph on the 1/8 reaction time was 1.0+ with a 60ft at 2.5?(First run ever, didn't know which light to go on)
---------
System = Sony explode 5000 CD/MD receiver
Rockford 6x9 Fanatics
Rockford 4x6 Fanatics
Rockford 2 12" Hx2's
Rockford 1 farad cap
Rockford 800x2 Amp
Custom box
4gauge wire kit