3.73 Gears Help
07-19-2012, 09:29 AM
#1
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Car: '91 Camaro RS
Engine: 5.7 350
Transmission: 700 R4
Axle/Gears: 3.73
3.73 Gears Help
So I have a '91 RS with a fully rebuilt 350 I put in last summer. Its running a mild aggressive cam at about 340-350HP from the rear wheel. Been having issues with accel and speed due to the horrible and I mean horrible 2.73 gears.
I've been looking around, talking and decided to go with 3.73 gears POSI.
Good choice?
And what about the speedo gears? Would anything else need to be changed?
I've been looking around, talking and decided to go with 3.73 gears POSI.
Good choice?
And what about the speedo gears? Would anything else need to be changed?
07-19-2012, 11:02 AM
#2
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Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: 3.73 Gears Help
I think 3.23 (bolt) or 3.27 (9 bolt) is a better all round daily driver ratio. Especially with the power you've got.
07-19-2012, 12:24 PM
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Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: 3.73 Gears Help
It's really tough to choose the "best" gear without knowing the cam specs. 3.73:1 gears with a 700r-4 and a 350 is an awful lot of fun in town. Not too bad on the highway.
07-19-2012, 12:52 PM
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Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: 3.73 Gears Help
For what its worth, I have 3.45's, personally I think they are the BEST all around gears. I have no experience with 3.27's but had 2.77s originally and they sucked. The difference from those to now is unbelievable. Not a rocket off the line but damn quick and cruises on the highway really well. I drive my iroc a lot around town and on the highway.
07-19-2012, 04:13 PM
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: 3.73 Gears Help
Not sure that cam will make as much power as you think it does.
As for gears, I would stick closer to 3;42 or so. 3:73 is a bit much really for a car that sees a lot of stret use
As for gears, I would stick closer to 3;42 or so. 3:73 is a bit much really for a car that sees a lot of stret use
07-19-2012, 04:43 PM
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Car: 84 Camaro
Engine: 357
Transmission: TH350
Axle/Gears: 4.10's / Strange LSD
Re: 3.73 Gears Help
I have to say 340 to 350rwhp is a bit high for that little cam but what do I know. For a daily driver I wouldn't go any deeper then a 3 42 gear.
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07-19-2012, 05:05 PM
#8
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Car: '91 Camaro RS
Engine: 5.7 350
Transmission: 700 R4
Axle/Gears: 3.73
Re: 3.73 Gears Help
Thx for the help all. Now idk which to go for, 3.42 or what. And trust me I know the cam ain't no big thing, I wasn't ready for the rebuild process but the 305 had blown. The shop that bored the engine dyno'd my car when I came back after i finished and it was 330 HP. I've done mild work on it since then. New air flow system, intake, fuel pump and etc.
07-19-2012, 05:50 PM
#9
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Car: '91 Camaro RS
Engine: 5.7 350
Transmission: 700 R4
Axle/Gears: 3.73
Re: 3.73 Gears Help
I do plan on putting a larger cam in if that helps. Maybe around a .48 to a .501, just trying to pass emissions first with this cam. My high idle is running HC's at 380, limit is 220 here in Delaware.
Last edited by RelentlessRS; 07-19-2012 at 06:17 PM.
07-19-2012, 08:29 PM
#11
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Car: '91 Camaro RS
Engine: 5.7 350
Transmission: 700 R4
Axle/Gears: 3.73
Re: 3.73 Gears Help
Why 3.42, just wanting to understand thats all, so when I do upgrade I know why I'm upgrading.
07-19-2012, 08:39 PM
#12
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Car: 1989 Formula, 1988 Camaro
Engine: Vortec 350 TPI, 2.8 V6
Transmission: 700r4, 700r4
Axle/Gears: 4th Gen 3.43 Posi, 3.43 Open
Re: 3.73 Gears Help
go with the 3.42 its good for a dd
07-19-2012, 10:48 PM
#13
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Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: 3.73 Gears Help
Even with my 5.0 I love the swap from 2.73 to 3.42 running a 700r4.(reasons being there great off the line and I can chirp the tires from 1 to 2nd and 2nd to 3rd,that's with including the Eaton Posi. and there just about right for the 700r4 and the 65mph interstate here in OD ,not to mention my speedo is right on the money with 27in. tall rear 255/65r15 tires and I use Drive as opposed to OD around town with the 3.42s.Thats a couple reasons at least for me.) Its perfect for my DD and I also installed a L.P.W.support cover.http://www.lpwracing.com/Diff_Cover_...omparison.html and here's were I bought it.= http://www.jegs.com/i/L.P.W./619/301-7.5G/10002/-1
Last edited by Ron U.S.M.C.; 07-19-2012 at 11:13 PM.
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