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Old 09-06-2009, 10:03 AM   #1
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Join Date: Aug 2009
Location: Las Vegas, NV
Posts: 75
Car: 92' Formula T-Top
Engine: L98 With Custom CAI
Transmission: BUILT 700R4 with B&M Mods
Axle/Gears: 3.23

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rear end ratio woes

im at a point to just pull the rear end cover.... i had an 82 firebird se that i took out the crappy 200c out of and replaced with a 700r4 and i still have a 91 camaro rs both cars would get about 70-75 mph at around 2000 rpm the 82 had diff then stock tires .... in the new addition to my f body fam is a 92 formula and about 62 mph in o/d locked up im at 2000 rpm the rpo code says that i have 3.23 gears im running stock 245-50-16 tires and the speedometer is correct as i got a ticket for 87 and i was doin just that lol... is that correct does anyone else have 3.23 gears that can relate to that prm range or does it sound more like 3.73's in there

here are the rear end codes as i found on the sticker
gu5
g80
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Old 09-06-2009, 10:44 AM   #2
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Join Date: Aug 1999
Location: Lawrence, KS
Posts: 16,248
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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Re: rear end ratio woes

Quote:
Originally Posted by DANNY25SS View Post
here are the rear end codes as i found on the sticker
gu5
g80
GU5 = 3.23 Approx RPM's at 70, 2133
G80 = limited slip

More info in the following link:

http://www.thirdgen.org/techboard/tr...-10-bolts.html (FAQ About 10-Bolts)

JamesC
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Last edited by JamesC; 09-07-2009 at 08:03 AM.
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Old 09-09-2009, 08:49 PM   #3
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Join Date: Dec 2005
Location: Beaufort South Carolina
Posts: 1,737
Car: 1983 Camaro Z/28
Engine: LU5 305 CFI
Transmission: 700R4
Axle/Gears: J65/G80/G92-3.23

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Re: rear end ratio woes

As JamesC pointed out it sounds like you're speedo is in the right range. I have 3.23s on my '83 Z28 and my speedo registers about the same. There were codes stamped into the right axle tube (diff side about center) that will show ratio codes and build date - if they are still readable.
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Old 09-18-2009, 08:43 PM   #4
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Join Date: Mar 2001
Location: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Posts: 10,326
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45

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Re: rear end ratio woes

@70 Mph... With a 700R4 (4L60)
My 2.73 = 1750 RPM - 87 Formula
My 3.73 = 2250 RPM - 89 Formula 350
My 3.27 = 2000 RPM - 87 Formula

Of course this is from my observations... My Gage may not be exact...

hope it helps.

John

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Old 09-25-2009, 07:15 PM   #5
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Join Date: Mar 2002
Location: 62656
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Car: 1991 S10 pickup 2700lbs
Engine: 4.3L Z TBI
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Re: rear end ratio woes

damn.. seems like my 82 t/a was the only 82 ever made without 3.23

it was 200c trans as well.


2.73 sucks.

not fair!


i had to stick a 2400 stall converter in the th350 i put under it to help make up for the crap axle ratio


hmm..
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Old 09-25-2009, 07:15 PM
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