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Old 12-23-2009, 06:04 PM   #1
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Location: St.John's, Newfoundland, Canada
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Car: 1986 Camaro Z28
Engine: 355 4 bolt 4bbl
Transmission: T-5 manual
Axle/Gears: 3.73 posi.

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rear end ratio puzzling
I've got an 86 Z28. the option list on this site says that the LG4 automatic only came with a 2.73 rear. But my RPO's are LG4 (305 4 bbl) MD8 MX0 (700 R4) and GU5 (3.23) rear gears. Also on the right axle tube there is PH stamped and I can't find any info on that. It is also a Canadian car if that makes a difference.Thanks.
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Old 12-23-2009, 06:06 PM   #2
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Location: Lawrence, KS
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
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Axle/Gears: Limited Slip 3.23's

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Re: rear end ratio puzzling
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Originally Posted by tyler86z28 View Post
I've got an 86 Z28. the option list on this site says that the LG4 automatic only came with a 2.73 rear. But my RPO's are LG4 (305 4 bbl) MD8 MX0 (700 R4) and GU5 (3.23) rear gears. Also on the right axle tube there is PH stamped and I can't find any info on that. It is also a Canadian car if that makes a difference.Thanks.
Welcome to TGO. The following link may provide some food for thought:

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

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Old 12-23-2009, 09:23 PM   #3
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Re: rear end ratio puzzling
When in doubt, trust the RPO codes. Just make sure the vin on the SPID matches the vin on your car. The tech data on this site isn't 100% flawless, it's just a guideline.
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Old 12-24-2009, 10:09 AM   #4
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Car: 93 Formula,88 T/A,01 WS6
Engine: 93 LT1,88TPI305,01 LS1
Transmission: 93 700R4,88 700R4,01 T56
Axle/Gears: 93 3:73's,88 3:42,01 3:40

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Re: rear end ratio puzzling
It's an old car. My experiance is people don't usually change gear oil in the diff as a maintenance thing. Spend a few bucks, pull the cover off and get the numbers off the gears. Mystery solved and new oil in diff.
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Old 12-24-2009, 02:48 PM   #5
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Location: St.John's, Newfoundland, Canada
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Car: 1986 Camaro Z28
Engine: 355 4 bolt 4bbl
Transmission: T-5 manual
Axle/Gears: 3.73 posi.

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Re: rear end ratio puzzling
Thanks guys. Doesn't really matter though cause just bought a posi carrier and a set of 3.73's.
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Old 12-24-2009, 03:24 PM   #6
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Re: rear end ratio puzzling
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Old 12-26-2009, 12:07 PM   #7
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Re: rear end ratio puzzling
Does the car have rear disc brakes?
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Old 12-27-2009, 09:40 PM   #8
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Car: 1985 Trans Am T-Top
Engine: 305 TPI
Transmission: T-5 5 Speed
Axle/Gears: 3.42 posi 1LE 10 bolt

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Re: rear end ratio puzzling
Mine didnt match the data either. I dont have my rpo's but my car should have had 2.73 , but i opened the diff and it has 3.42. The brakes werent hooked up right either, so im guessing th Po swapped in an axle from a V6 car.
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Old 02-04-2010, 08:34 PM   #9
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Join Date: Dec 2009
Location: St.John's, Newfoundland, Canada
Posts: 10
Car: 1986 Camaro Z28
Engine: 355 4 bolt 4bbl
Transmission: T-5 manual
Axle/Gears: 3.73 posi.

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Re: rear end ratio puzzling
Its got drum brakes. Its a 10 bolt 7.5 with 26 spline axles.
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Old 02-04-2010, 08:46 PM   #10
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Car: 89 TA / 94 C4
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Re: rear end ratio puzzling
Quote:
Originally Posted by tyler86z28 View Post
Its got drum brakes. Its a 10 bolt 7.5 with 26 spline axles.
well if it's a limited slip lift both wheels shift to neutral mark the drive shaft mark your tire and turn and count the drive shaft mark..
you will be very close to the real gear ratio
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Old 02-04-2010, 10:43 PM   #11
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Re: rear end ratio puzzling
One of my cars is rpo 4 2.73 open.
the axle is coded 4 2.73 posi but it has a (GM gears) 3.08 open..
I have looked and looked 4 any clue 4 a rear swap but cant find any..
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Old 02-04-2010, 10:43 PM
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