BLUE92RS

I was going to put in 3.73 gears but then i read some posts that said go with 3.42's The only mod i have done is the k&n open element. I want a lot of acceleration but i don't want to lose all my top end. I have been told that with 3.73 gears my top end will be around 120 which it cant go anyways because of the speed gov.What do you guys think.

91Bird305

I had both 3:73 gears and 3:42's. I would have to say 3:42's just cause there isn't much of a difference really and with my 3:73's it really took off the line but it didn't feel as strong around 50-60mph like the 3:42's do. My 3:42's give me more pull up to 60mph and thats when u do most of your racing really. 0-60mph. I don't know, thats just my opioion. GM Motive gears too, Richmonds whine. Also, if your going to do a gear swap, might as well do a posi unit swap too. Get rid of that peg-leg rear end posi. Go with something like a Auburn posi unit or something. Make sure you get the same carrier gears as the posi units carrier. Most likely it will be a carrier 3 posi. But if you don't get the posi unit then your peg-leg posi u have now in that rear end is a carrier 2. So make sure the numbers match when doing gears or posi, or they won't work.

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Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html

badbird88

if you have an auto I would definetly go with 3.42 gears if you have a manual the 3.73 gears want be to bad and 5th gear will have more acceleration. I like my 3.42 gears in my 5speed and think 3.73 gears would push the car up into the rpms too much for long cruises. I have decent acceleration in 5th (0.63 ratio) and my top speed well let's just say I don't know b/c my speedo stops at 145 .

I've talked to a friend of mine who has a 94 formula with the auto and he put 3.73 gears in and wish he had gone with 3.42 gears b/c of the top speed runs or for long road trips. He said the gears made a huge difference on take off but overall the 3.42 gears are a good all around gear for 1/4 sprints or long cruises.

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1988 TA 300+hp 350 w/ TBI and Holley TB unit, Holley projection intake,
WC T-5, 3.42 gears w/ Auburn posi. MSD 6A, edelbrock TES headers, dynomax 3" cat and cat-back system, ACCEL coil, polyurethane bushings all around, aluminum driveshaft, Mr. Gasket open air cleaner.

1993 S-10 w/ 4.3L V6 TBI, slightly bigger cam, Mild polish job and 3 angle valve job on heads, Edlebrock TES headers, Dynomax cat back, MSD 6A, ADS chip

2000 Kawasaki KX 125

NJ SPEEDER

the more gear the more quick. that's why i am putting in 4.10's this winter.

lata
tim

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91 Camaro RS-LO3,Auto.
14.390 @ 94.99mph
Edlebrock TES Headers, Cat Eliminator Pipe, Borla Adjustable Cat Back,Marche Pulleys, HyperTech Chip,Transgo Shift Kit,B&M Convertor(2000stall), 36mm Front 25mm Rear Sway Bars, Eibach Pro Kit Springs, Bilstein Shocks and Struts, Steve Spohn Rear Rig( all rod ends), Poly Front Bushings, Baer Track Kit Front Brakes W/ Baer Disc Rears, 17x9 4th Gen SS Wheels, Ported TB, Edlebrock Performer TBI Intake, Performer Heads, 1.6 Roller Tipped Rockers

91Bird305

Yeah, the more quick off the line. But lets see you a ways down the stretch or on the highway. With 4:11's you will sacrifice that. High gears are for drag strip. 3:42's are for street/strip.

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Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html

92rs305

this is something you are only going to do once, right?

do it for the long run. all those mods are for upper rpm's that will work best with the 3.73's.



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92rs open air,accell coil,9000 wires,rapid fire plugs,b&m shiftkit,3.73 posi out of 97 blazer,open exhaust,hypertech chip,175000 miles.

ONEFINE8T9

i went with 3.73s with my 5 spd and i love them. 1st gear will launch nicely and the pull all the way through the gears was much improved. I agree the more gear the better. I mean i wouldnt go no farther than 4.10 but with the lower hp cars a higher gear would be better. Its easier for the motor to push the weight there fore accelerateing faster. My friend has them in his 86 LG4 camaro and it made one hell of a difference. I really noticed it more between 0 to 70. He went with richmonds and so did i. They do make a little whine but if u want to get into high hp #s i would go with them. They have a different cut compared to most gears, thats what makes them stronger. If u want something for top speed than 3.42 would be what u want. gm motive or richmond gear is really ur choice though. It depends on what u plan to do with ur car.

BTW if the gears are put in correctly they wont whine barely at all.

BLUE92RS

I already have my posi it is a 3-series.So everybody keeps saying 3.42's but isn't there a huge difference between 3.42's and 3.73's. Why wouldn't you want to be a lot quicker with the 3.73's. I don't want to put in something and not be happy because it is quite a bit of money to get it done. Will there be a huge difference when a move form the 2.73 to 3.42's i know there would be one eith the 3.73's

ONEFINE8T9

from 2.73 to 3.42 would certainly be a noticeable difference but it wouldnt be as noticeable as 3.73.

91Bird305

I am speaking from experince with both 3:42 and 3:73's and there is not a big difference between the 2 ratio's. But if I had to do it all over again I would go 3:42's. 3:73's are nice too but if I had to choose between 3:42's or 3:73's, I would go 3:42's. And thats true about gear whine. If they aren't put in right they will whine but Richmond gears are notrious for whining even if you put them in right or not. I called Richmond on it and I talked to the guy that installed them. Now that I have GM motive gears they don't whine and it was the same guy.

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Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html