I received my Zexel-Torsen OEM and my new gears yesterday. I wanted 3.42 and the sent 3.73. I am afraid the 3.73 are going to make the thing guzzle more gas and make the car loud at freeway speeds due to turning so many rpms making too much exhaust noise. Someday I might be putting something as powerful as a zz4 in it. But no intentions of any drag racing. I just want a nice every day gear that has a little more ***** to it than the 2.73. How many more rpms is the 3.73 going to turn at lets say 75MPH than the 2.73 and the 3.42. Should I send it back and make them give me the right gears. I hate to pay shipping back to them.


<img border="0" src="http://www.bharris.org/images/smcamconv.jpg" width="200" height="73"></p>

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91 Camaro RS 5.0L Black Convertible 700R4. Owned 5 months bought from 1 owner girl. Working on that stock part.
** Added so far **
*GM Wonderbar
*Alston SFC

personaly opinoin that 373 is way to much gear for 305 tbi's . personally since mine is a dialy driver and gas milage it ssomewhat important to me am going to rebuild my rear end with a posi 323. if its not a dialy driver you could get away with a 342 but it will kill you on gas and not only that it will put more stress on your engine. The choise is all yours .

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91 camaro RS
- 305 TBI
Mods: Performer tbi intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter

Soon to come .SLP Posi 323 rear end , Spohn LCA's and panhard bar , Ascd ram air hood, Z28 spoiler and grille , white guage faces.

Personally, in an automatic car, 3.42's are pretty good. They'll wake up your off the line performance considerably and shouldn't hamper fuel mileage horribly. With a 26 inch diameter tire, you will be running 2043 rpm at 75 mph and 2560 rpm with 3.42 gears. That still isn't horrible. Good luck. 3.73 will be 2792 rpm. 3.23 will be 2418 rpm.

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1992 Camaro Z28; Engine:383 w/Ported Edelbrock RPM heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampr, Comp Cams 1.5 Roller rockers and lifters, Comp Cams Triple Valvesprings, SVO 30 lb injectors. Holley/Walbro 255 lph in-tank pump, Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, SLP Clutch, Pro-5.0 Shifter, 4.10 Gear, Auburn Offroad Pro Posi. Super Ram. 17" X 9.5" Ronal FireHawk Rims w/ 275 40ZR17 Bridgestone RE 730's up front and Nitto Drag NT 555R's out back.

Double-Pump This! EFI Rules!

Where can I buy new speedo gears (drive gear and donut gear) in a 3.42 for my car with 245/50 R 16 tires on it. SLP can't get them. My local gm dealer is a bunch of morons saying that I can't use the zexel OEM because the newer 4th gens don't have speedo gears. I don't see what that has to do with anything. So they wouldn't even give me a part no. for GM speedo gears. I really think putting 3.73 in my stock TBI is tooo much gear. Sure I will launch great. But cruising down the highway all I am going to hear is the drowning exhaust of turning almost 3000 rpms. Might as well throw the radio out the window. Not to mention my nice 26mpg on the highway quickly becoming like 15. I can't even find a new set of GM 3:23 (discontinued) I don't want Richmonds they are TOO noisey. I have them in my truck and haven't been pleased at all. Other than I haven't tore em out yet. Always a plus. I know a lot of you have more thirdgen experience than I (almost all of you really). What the hell do I do? I am thirty four years old and married (told the wife I wasn't going to modify it like I did my truck, OOPS). I don't want to drag race it. But I don't STOCK Honda Civics beating me out of the light either. I want Posi so I bought the OEM ZEXEL (great price). I run 3.42's in my truck with 27" 275/60 R 15 tires and it droans enough at 75mph. I don't want to mess with this thing so much that it is unpleasant to drive anywhere I want to go. Especially with the top down. So give me some advice. I will seek more such advice from the engine dept. in a couple minutes.

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91 Camaro RS 5.0L Black Convertible 700R4. Owned 5 months bought from 1 owner girl. Working on that stock part.
** Added so far **
*GM Wonderbar
*Alston SFC

You should be able to get the gear from your GM dealer. They must be morons. The speedo gear has nothing to do with the rearend. It's in the trans. Morons. Anyway, the 3.42 gear would be a good choice. It would be my choice. If you have a stock exhaust, I wouldn't worry about the noise either.

how did the install of your sub frame connectors go? I 've been looking all over and there are few companies that make them for the 91 convert. are yours weld in? how much did you pay? any info you can give me would be great.

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91' red RS convert.
71,000 miles
89' IROC hood
red Z-28 16" rims
potenza re730's
MSD ignition
MSD coil
K&N fiter
350 ported polished heads
hypertech chip
flowmaster 40 series cat-back

If SLP sent you the wrong gear, and its their mistake, then they should pay for shipping.

The speedo gears for a 3.42 automatic car are 15 tooth and 41 tooth.


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

They are the Alston Bolt on SFC's. I welded them in so they wouldn't work loose. I have a mig welder too. The passenger side is going to be a pain due to exhaust in the way. I am going to take it to my exhaust guy and have him cut the exhaust where he wants and we will weld the other SFC in and put the exhaust back with the cat moved just a little so it won't be vibrating against the SFC. My SFC's were about $180 shipped to the door or so. I would have to dig up the receipt to be sure. Even with just one it sure helped my convertible flex. It has flexed so much that the plastic is cracked on the inside of the windshield. Once I get everything fixed I will have to see what that plastic costs to replace. I only have little cracks and pops going over rail road crossings instead of the loud pops I used to get. It feels stiffer too.


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91 Camaro RS 5.0L Black Convertible 700R4. Owned 5 months bought from 1 owner girl. Working on that stock part.
** Added so far **
*GM Wonderbar
*Alston SFC

IF YOUR LOCAL GM DEALER IS AN IDOT CHECK THERES GUYS OUT THEY HELPED ME GET THE RIGHT SPEEDO GEARS

http://www.worldparts.com/gmperforma...autoindex.html

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91 camaro RS
- 305 TBI
Mods: Performer tbi intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter

Soon to come .SLP Posi 323 rear end , Spohn LCA's and panhard bar , Ascd ram air hood, Z28 spoiler and grille , white guage faces.

go to another dealer, don't even tell them where you got the gears that is whats confusing them.

i got speedo gears for my 89 a couple of months ago from the local chevy dealer(3.42-700r4)but they had to order them.my car turns 2800 at 72 mph with 215-65-15s

Hi, brharris27370!

I'm not sure what the 4th (overdrive) gear ratio is in your 700R4, but the '93 Z28 4L60 is a 0.70 ratio. I figured your rpm cruising at 70 mph in 4th gear O.D. (0.70 ratio) and 26" tall tires. With 3.42's, you'll turn 2,166 rpm. With 3.73's - 2,362 rpm. With 4.10's - 2,596 rpm. That's figuring with a tight, lockup converter. Without lockup feature, most automatics loose 5% or more power/mileage through internal slippage, so your rpms would increase by slippage factor if no lockup converter.

My son's '89 RS Camaro came stock with 3.42 gears (no posi). Originally, it was a 2.8 litre V6 with a T-5 tranny. This summer, we're installing a 350 Vortec V8 and a T-56 tranny. We'll be replacing his rear end with a Dana 44 posi from SLP with 4.09 gears, as the 6-speed has a 0.50 6th gear ratio and we wanted a stronger rear. He has 26" tall tires and will only turn 1,850 rpm in 6th gear at 70 mph. Due to his gearing, we used an RV type cam to get as much torque at low and mid-range rpm from his engine as we could. By contrast, my '57 Chevy runs 4.56 rears and a T-56 with a 0.62 6th gear ratio and 26" tall tires. At 70 mph, my '57 is turning 2,558 rpm. So I'm running a fairly radical solid lifter cam to make power at higher rpms.

Too bad you're not closer to Texas - we'd give you the son's 3.42 rear if you'd come pick it up this summer! Then you could have it rebuilt using the Torsen Zexel posi unit and you'd be ready to go!

Happy Motoring,

Harry

[This message has been edited by enigma57 (edited April 12, 2001).]

I'd call slp and get what you really wanted in the first place - they have USUALLY been ok to deal with when I've had issues. Don't base your decision on someones screw up. Do what you want the first time or you will always wonder . . . what if ?

Thanks guys. I contacted SLP and they are going to change the gears for 3.42. I believe they are my best option to give me some take off power and not screw up my good gas mileage too much. BTW took my RS to Maryland (8hr drive) and got 31 MPG on the way up and 29MPG (running AC) on the way back. Couldn't believe it. That was all freeway with cruise set at 72mph. I picked on my wife. Her 98 Maxima gets 28 making the exact same trip at the same speed. I knew my recent tuneup made it run much better but wow. The power pulleys made a huge difference in my opinion. The motor revs much faster than it did before.

Dude, real simple, wanna know how loud your car is going to be with the 3.73 gears over the 3.42 gears. Do some of the equations and listen to your car under load at that rpm.
https://www.thirdgen.org/newdesign/t...ulations.shtml
Measure your wheels, most 16x8 are 13"R.
With my setup (16x8, 3.08 rear, .69 overdrive) I get 74mph at 2000rpm and that's exactly what I'm getting. With 3.73 gears I need 2500rpm to cruise at 75mph. Let me figure you have 13"R (26"d.):
1800rpm you're at 75mph with the 2.73 gears
2500rpm you're at 75mph with the 3.73 gears
Go drive at 70mph (not 75) in 3rd gear and that's what it's going to sound like. Try and ignore the tire tread noise when doing the test drives. To get the idea of what the car will sound like with the 3.42 gears, drive the car at 65mph in 3rd gear.
BTW, smart move with the Alston SFC and wonderbar. Do your suspension first so you can at least enjoy your ride stress free. You can't enjoy the car when there are 10 rattles and you only know what 3 of them are! Been there, done that, fixed that!
If you plan on going with an engine swap in the future then the 3.73 gears are probably going to be nice with a high hp engine. Keep the boards updated and good luck.

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, Jon (350 TBI! getting 23mpg highway)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

A 200 rpm increase with 3.73's at 75 isn't going to make a noticable difference in fuel mileage or engine noise. Mileage doesn't relate directly to engine rpm. Lower rpm if you constantly drive on the highway will help mileage but the change in rpm needs to be fairly big. How you drive will have the biggest effect on mileage.
75 will be about 2300 rpm with the 3.42's
75 will be about 2500 rpm with the 3.73's.
3000 rpm will be 90 mph with 3.73's.
However you look at it, 3.42's are still an improvement over what you already have.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro