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Old 07-30-2010, 03:23 PM
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Gears vs ET

OK, I'm sure gears have been done to death, but, after searching all over the place I am having a very difficult time finding actual ET results from gear changes. I presently have 3.08 gears in my 454 f-body. 3 speed auto and have a set of 3.42 or 3.73 gears to change to.

Can someone please give me what their gear change did for their 60' and 1/4 et/mph.

Presently have stock converter and best of 13.8

Will be dropping the tranny soon to change converter to a 2400


I hope we are able to compile a short list of results as since I have started searching for this I have found many who have asked but few who have had a before and after number. I realize this one is a little more difficult to nail down, but certainly worth a shot.

Thanks for your help.

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Old 07-30-2010, 03:41 PM
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Which trans do you have, and what type/size tire are you using?
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Old 07-30-2010, 04:31 PM
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Using 27 inch sticky tires at the track, its a turbo 350.

Cam is a xe268 comp, dual plane intake, headers.
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Old 07-31-2010, 02:53 AM
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It might ET a little better w/the 3.73's than w/the 3.42's, but it really depends on how much highway driving you do- the 3.73 is as much as I would ever put up w/on the street for any duration- but that's me, had enough of buzzing around w/low rear gears some time ago. 3.42's are doable on the highway, as long as the mufflers don't drone too bad. Darn, that sounds like it's coming from some old guy. lol

Anyway, you should be capable of 1.7 short times and should be well into the 12's- say 12.50 if it hooks good, and you have a decently matched combo. I'm guessing the cam is fairly mild?
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Old 07-31-2010, 06:10 PM
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Cam is mild, if the difference will be small then 3.42 might be safer, this thing never sees the highway other than about 15 minutes to the track. The rest of the time its stop light to stop light.
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Old 01-28-2011, 07:07 AM
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ET VS GEARS: A LOT DEPENDS ON THE HP OF YOUR ENGINE. ON STREET VEHICLES LOWER WINDING ENGINES USUALLY GET HIGHER GEARS AND VISE VERSA ON MOST PRODUCTION VEHICLES. 3:08 TO 3:73 ARE COMMON IN V8/V6 STREET CARS, LOWER GEARS ARE USUALLY FOUND IN TRUCKS FOR LOW END PULL. DRAG RACING THE 1/4 MILE USUALLY CALLS FOR 4:10, 4:30 RANGE FOR GOOD PERFORMANCE ALSO TAKING INTO CONSIDERATION HP & STALL SPEED & TIRE SIZE. SHORT TRACKS 1/8TH MILE & 1/10TH USUALLY REQUIRE HIGHER GEARS 4:56, 4:88, 5:11, 5:13 ETC DEPENDING ON HP AND STALL SPEED & TIRE SIZE. RICHMOND PRO GEARS ARE A GOOD ENTRY LEVEL RACING GEAR TO BUY. GOOD LUCK ISI RAY RACING ROCHESTER NY
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Old 01-28-2011, 04:48 PM
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Quote:
Originally Posted by Isi Ray
RICHMOND PRO GEARS ARE A GOOD ENTRY LEVEL RACING GEAR TO BUY. GOOD LUCK ISI RAY RACING ROCHESTER NY
Pro gears are NOT a good ENTRY LEVEL gear. They are expensive and only needed in high horsepower situations or launching with a clutch or transbrake at high rpms, and they wear faster than a street gear.

Bill
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Old 01-28-2011, 05:38 PM
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I suppose there are a lot of guys who don't realize the "Pro" gears are even 'softer' than OEM gears- for the reasons you mention, mainly to absorb a high shock load w/o shattering.

But for "A GOOD ENTRY LEVEL RACING GEAR TO BUY" (lose the CAPS!), if racing is the primary goal, the Pro gears are fine.

In the case of the OP, he does not need Pro racing gears.
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Old 01-28-2011, 08:29 PM
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Quote:
Originally Posted by 80ta
and have a set of 3.42 or 3.73 gears to change to.

Thanks for your help.
OP, all ready owns the other gears
asking which would be better
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Old 01-29-2011, 02:37 AM
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When the car ran a 13.8 et what was the mph? What waa the MPh in the 1/8th too.
You need to know this to gear it correctly.
You want to finish the 1/4 at around 5800-6000rpm.
Think 4.10 or 4.30's

Don't bother with a "2400 stall" converter. its not enough.
A stock 12" th350 converter behind a 454 will give a 2500 stall.

You want to launch much higher. Get a 3000-3200 10" rated converter at least.
3500-3800 stall is best. Spend the money once and get the right converter for the job.
Get some traction bars and a driveshaft safety loop.

Recurve the distributor with 24 base initial at idle and 38 total (92 octane)
So it will launch clean and hard right from a idle. (1000 rpm)

Last edited by F-BIRD'88; 01-29-2011 at 02:52 AM.
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Old 01-29-2011, 05:31 AM
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Quote:
Originally Posted by 80ta
OK, I'm sure gears have been done to death, but, after searching all over the place I am having a very difficult time finding actual ET results from gear changes. I presently have 3.08 gears in my 454 f-body. 3 speed auto and have a set of 3.42 or 3.73 gears to change to.

Can someone please give me what their gear change did for their 60' and 1/4 et/mph.

Presently have stock converter and best of 13.8

Will be dropping the tranny soon to change converter to a 2400


I hope we are able to compile a short list of results as since I have started searching for this I have found many who have asked but few who have had a before and after number. I realize this one is a little more difficult to nail down, but certainly worth a shot.

Thanks for your help.
What gear are you crossing the 1/4 mi finish in? 2 nd? And what are you using the car for when your not racing it?
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Old 01-29-2011, 07:56 AM
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Quote:
Originally Posted by 80ta
Cam is mild, if the difference will be small then 3.42 might be safer, this thing never sees the highway other than about 15 minutes to the track. The rest of the time its stop light to stop light.
i would use the lower gears because of the lack of hwy time this car sees
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Old 01-29-2011, 10:21 AM
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There is an advantage and dis-advantage to both set's of gears. What you need to do is make up your mind on what ratio and live with it. It's hard to have the best of both worlds with just one ratio. If your more serious about ET's than mileage go with the 3:73's. If the day comes that you want or have to make a road trip, go with the 3:42's. You know BB's love gas and 3:73's are going to be close to only 10-12 mpg at best. Maybe you need to look into a 700R4 tranny.
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Old 01-29-2011, 08:17 PM
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Gears Vs Et

TO ANSWER THE ORIGINAL QUESTION ET VS GEARS,THE BEST WAY TO IMPROVE YOUR 60FT ETS AT THE RACE TRACK IS TO: STEP UP TO A HIGHER GEAR RATIO (I WOULD GO WITH THE 3:73S), IF YOU MUST USE A STANDARD TRANNY SPEND THE MONEY ON A GOOD RACING CLUTCH PLATE AND THROW OUT BEARING
(I LIKE AUTOMATICS 1000HP PG 5500 STALL BABY ), GO WITH THE APPROPRIATE SIZED TIRE FOR YOUR SETUP RULE OF THUMB MORE HP BIGGER TIRE.(I RUN 14 X32S) LOOK AROUND AT THE OTHER RACERS SET UPS AT THE TRACK AND SEE HOW THEY PERFORM.

MY SET UP VEGA TUBE CHASIS 500HP 406/235CC-2.08-1.60 HEADS
1000 HP POWER GLIDE/5500 STALL, DANA60 REAR AXLE 4:56, 14x32 GOOD YEARS
RICHMOND SELLS GEAR SETS FROM $89 TO $400 THE MORE YOU PAY THE BETTER GEARS YOU GET. ALL THIS DEPENDS ON WHAT YOU ARE DOING WITH THE CAR AS WELL 1/4, 1/8TH MILE? IS IT A RACE CAR OR STREET & STRIP CAR MAKE UP YOUR MIND? IT SEEMS I STIRRED UP SOME GEAR HEADS COOL
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Old 01-29-2011, 10:17 PM
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Quote:
Originally Posted by Isi Ray
TO ANSWER THE ORIGINAL QUESTION ET VS GEARS,THE BEST WAY TO IMPROVE YOUR 60FT ETS AT THE RACE TRACK IS TO: STEP UP TO A HIGHER GEAR RATIO (I WOULD GO WITH THE 3:73S), IF YOU MUST USE A STANDARD TRANNY SPEND THE MONEY ON A GOOD RACING CLUTCH PLATE AND THROW OUT BEARING
(I LIKE AUTOMATICS 1000HP PG 5500 STALL BABY ), GO WITH THE APPROPRIATE SIZED TIRE FOR YOUR SETUP RULE OF THUMB MORE HP BIGGER TIRE.(I RUN 14 X32S) LOOK AROUND AT THE OTHER RACERS SET UPS AT THE TRACK AND SEE HOW THEY PERFORM.

MY SET UP VEGA TUBE CHASIS 500HP 406/235CC-2.08-1.60 HEADS
1000 HP POWER GLIDE/5500 STALL, DANA60 REAR AXLE 4:56, 14x32 GOOD YEARS
RICHMOND SELLS GEAR SETS FROM $89 TO $400 THE MORE YOU PAY THE BETTER GEARS YOU GET. ALL THIS DEPENDS ON WHAT YOU ARE DOING WITH THE CAR AS WELL 1/4, 1/8TH MILE? IS IT A RACE CAR OR STREET & STRIP CAR MAKE UP YOUR MIND? IT SEEMS I STIRRED UP SOME GEAR HEADS COOL
push down on the CAPS LOCK button and this wont happen anymore
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