Factory 3:73 in a third gen?
07-11-2016, 07:57 PM
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Car: 86 2wd
Engine: 305
Transmission: 700r4
Axle/Gears: 2:73 open (for now)
Factory 3:73 in a third gen?
Looking to buy a rear end out of a 84 Z28 L69 Camaro, when I looked at the RPO codes, it had a code of "GT4". I know that is a 3:73. The best gearing ive seen has been 3:42's in the 5 speeds. Was the 3:73 a factory gear in the third gen camaros? Or special order?
Had to take a pic of the codes just so i could ask u guys lol
Had to take a pic of the codes just so i could ask u guys lol
Last edited by bigarmzz; 07-12-2016 at 08:51 PM. Reason: i'm dumb
07-11-2016, 08:06 PM
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Factory 3:73 in a third gen?
Couldn't say about "the first you've ever seen"; but being as how it's a L69 car, yeah. Maybe you just haven't seen many L69 cars?
That's what my car had. (has)
That's what my car had. (has)
07-11-2016, 09:03 PM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Factory 3:73 in a third gen?
Carbed cars yes, EFI stuff, nope
07-11-2016, 10:33 PM
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Car: 1984 Chevrolet Camaro Z28
Engine: 5.0 Liter 4-BBL V8 High Output
Transmission: 5-Speed Manual
Axle/Gears: 3.73
Re: Factory 3:73 in a third gen?
[QUOTE=bigarmzz;6057958]Looking to buy a rear end out of a 84 Z28 L69 Camaro, when I looked at the RPO codes, it had a code of "GT4" and "D80". I know that is a 3:73 posi. The best gearing ive seen has been 3:42's in the 5 speeds. Was the 3:73 a factory gear in the third gen camaros? Or special order?
It's A 3.73 But It's Not Posi,D80 Is A Spoiler,G80 Is Posi.
It's A 3.73 But It's Not Posi,D80 Is A Spoiler,G80 Is Posi.
07-12-2016, 06:17 PM
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07-12-2016, 08:50 PM
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Car: 86 2wd
Engine: 305
Transmission: 700r4
Axle/Gears: 2:73 open (for now)
Re: Factory 3:73 in a third gen?
[QUOTE=gt4373;6058038] "G80" not "D80", cant believe I got those wrong lol, blonde moment
Looking to buy a rear end out of a 84 Z28 L69 Camaro, when I looked at the RPO codes, it had a code of "GT4" and "D80". I know that is a 3:73 posi. The best gearing ive seen has been 3:42's in the 5 speeds. Was the 3:73 a factory gear in the third gen camaros? Or special order?
It's A 3.73 But It's Not Posi,D80 Is A Spoiler,G80 Is Posi.
It's A 3.73 But It's Not Posi,D80 Is A Spoiler,G80 Is Posi.
07-12-2016, 10:14 PM
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Car: Yes
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Transmission: Sometimes
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Re: Factory 3:73 in a third gen?
Yup, the L69 5-spd cars AFAIK ALL had that gear. But most, maybe not all, of the 84 auto ones were nutted with the 3.42s.
1LE cars didn't come with the good gears. 3.42 at best in the 5-spd ones.
1LE cars didn't come with the good gears. 3.42 at best in the 5-spd ones.
07-13-2016, 06:22 AM
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Car: '84 Z
Engine: L69
Transmission: T5
Axle/Gears: 3.73
Re: Factory 3:73 in a third gen?
The RPO label is MX0 automatic, L69, and GT4. GT4 3:73 was optional on the LG4, but not with L69 automatic per brief look at GM Tech Data. May be missing it. My 'memory' says 3:73 was optional on L69 auto.
07-13-2016, 07:11 AM
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Factory 3:73 in a third gen?
3:73 was optional on L69 auto
My late little bro had a 87 MC SS L69/auto/3.73.
G80 (posi) was very uncommon in the early years of these cars... I've heard any number of excuses for why, but I don't know which if any are true.
07-13-2016, 07:41 AM
#13
Re: Factory 3:73 in a third gen?
In truth though, for the road racing purposes intended the 3.42's were plenty. 3.73's would have been overkill considering TPI's powerband. In a road racing environment you spend very little time in 1st. Sometimes tracks you don't even touch 2nd. So the 3.42's were a good middle of the road gear in a series that didnt' allow you to change the car to suit the track.
07-18-2016, 02:07 AM
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Car: 1988 Camaro
Engine: 355, 10.34:1, 249/252 @.050", IK200
Transmission: TH-400, 3500 stall 9.5" converter
Axle/Gears: Ford 9", detroit locker, 3.89 gears
Re: Factory 3:73 in a third gen?
Yep one of my parts cars from last year was an '84 trans am, L69, auto. Had a factory 3.73, disk brake open (non posi) rear under it
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