3.23 or 3.73?
09-03-2010, 06:32 PM
#1
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Car: 1985 Pontiac Trans AM
Engine: 5.0
Transmission: t-5WC
Axle/Gears: 3.23 open diff.
3.23 or 3.73?
85 ta.305 . 5speed.how do I find out what gears I have with out pulling the cover?
09-03-2010, 08:46 PM
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: 3.23 or 3.73?
By pulling the cover.
What's so scary about that?
Everything else is just a bunch of guessing.
What's so scary about that?
Everything else is just a bunch of guessing.
09-03-2010, 08:59 PM
#3
Re: 3.23 or 3.73?
Find out your speed at two different speeds, write down the rpm's and go here:
http://www.richmondgear.com/101032.html
If you have an overdrive gear, chane it from 1.00 to whatever is your overdrive ratio.
Not hard to do.
Alot easier than jacking up the camaro and pulling the cover.
http://www.richmondgear.com/101032.html
If you have an overdrive gear, chane it from 1.00 to whatever is your overdrive ratio.
Not hard to do.
Alot easier than jacking up the camaro and pulling the cover.
09-04-2010, 07:00 AM
#4
Re: 3.23 or 3.73?
The numbers are stamped on the ring and pinion.
42 : 13 = 3.23 (RPO GU5) / Approx. RPM’s at 70 mph--2133
41 : 11 = 3.73 (RPO GT4) / Approx. RPM’s at 70 mph--2463
JamesC
Last edited by JamesC; 09-04-2010 at 07:04 AM.
09-04-2010, 07:29 AM
#5
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Car: 92RS 25th Anniv./88 IROC Z28 Vert
Engine: 305 TBI w/Tpi Air / 305 TPI
Transmission: 700r4/700r4
Axle/Gears: Posi
Re: 3.23 or 3.73?
Going off memory my 88 IROC is GU5 Posi and I am not sure about the RPO on my 92 RS but it is stock auto so....probably not the greatest. My question is it better to have a 2.23 vs 2.77 or in other words the higher number the better or visa versa.
09-04-2010, 08:32 PM
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Car: 92RS 25th Anniv./88 IROC Z28 Vert
Engine: 305 TBI w/Tpi Air / 305 TPI
Transmission: 700r4/700r4
Axle/Gears: Posi
Re: 3.23 or 3.73?
Did pull the cover this spring on the IROC and it was almost bone dry with a bad seal...previous owner had not checked....but got her sealed and lubed up and noticed and immediate diference in performance..
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