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Old 07-26-2004, 07:55 PM
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Geared too low? please help???

Hi all, I have a 73 camaro. When I bought it, the motor was locked up so I never drove this car. I just rebuild the engine, and when I drive the car, it seems like its in to low of a gear. Just to get to 50 miles per hour, the engine seems to be reving high. When I take my foot of the gas, there is alot of drag like its in 2nd gear, but it does shift through all gears. I shifted them manually as well to make sure, I had all three gears working. Please someone help.

Magic
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Old 07-26-2004, 08:06 PM
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Look for a tag on the differential and see what gears you have. I have 4.10's and it cruises at about 2800 RPM at 55 mph.
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Old 07-26-2004, 08:19 PM
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Found this number to the right of the cover on the rearend.
E 30 3 Is that the right spot if not where do I look?
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Old 07-26-2004, 08:25 PM
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Jack the rear up, mark a 12:00 o'clock position on a tire, mark the drive shaft at a place you can easily see. Rotate the tire one revolution and count the number of turns on the drive shaft, this should get you close to the gear ratio.
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Old 07-26-2004, 10:34 PM
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Pull the cover and look at it.

Troy
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Old 07-27-2004, 02:07 AM
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If you jack up one wheel, you must multiply your result by two, then see what was available in your rear end that comes close. Jacking up two wheels works well (and in fact is necessary) with posi, but with a single-track, it's not reliable because the wheels will sometimes turn in opposite directions.

1-1/4 turns=around 2.5 (2.41, 2.56)
1-1/3 turns=2.7 (2.73 or thereabouts)
1-1/2 turns=3.0 or 3.08
1-3/4 turns=3.5 (3.55 or 3.42)

etc.

Or just turn the jacked-up wheel TWO turns, & your driveshaft revolution count is your gear ratio.
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Old 07-27-2004, 08:25 AM
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The gear is 4.10 Now with that information, whats a good gear to put in it as a daily driver. I would like to be able to cruise the highway with out reving the hell of the car.
Thanks for all the help
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Old 07-27-2004, 10:08 AM
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If you had overdrive, you could live with a 410, and have low end and a better upper end.

I run 373s and overdrive in my 66, and it is just right.

No overdrive, a good gear for every day driving is a 352 or a 332. a 373 will give a little more low end but will work the engine on the upper side.

Troy

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Old 07-27-2004, 10:37 PM
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I'm running 3.90's behind a 4l60 and its fine. Best solution would be to do tranny swap 4L60's are showing up in the wreckers now. Stay away from pre-89 transmission they had a number of issues with them. An easy way to idendify a 89 and up is that it will only have 1 pressure tap plug on the driver's side of the transmission just above the **** lever.

I criuse at 2200 at 75 mph. With 4.11's it would be about 2350 rpm. Its a lot easier to do a tranny swap than a gear swap if you have never done rear gears before. You would need a good press and pullers to set the pinon depth right.




Quote:
Originally posted by troy-curt
If you had overdrive, you could live with a 410, and have low end and a better upper end.

I run 373s and overdrive in my 66, and it is just right.

No overdrive, a good gear for every day driving is a 352 or a 332. a 373 will give a little more low end but will work the engine on the upper side.

Troy

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Old 07-27-2004, 10:50 PM
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One way you can compensate for your gears till you get the money to change your gears is go to the tallest tire you can find, like a 255-70-15. This will create less rolling resistance and being about 30 inches tall and with the circumference of these tires it will cut your gear down to about a 3.84 which will make it more livable.
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Old 07-27-2004, 11:23 PM
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A new set of tires that size will cost about as much as a set of gears.

Troy
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Old 07-28-2004, 05:59 PM
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Quote:
Originally posted by troy-curt
A new set of tires that size will cost about as much as a set of gears.

Troy
UNTIL you pay someone to put those gears in for you.

Or, like I did put them in yourself and save a BIG bundle of cash in doing it.
I even lucked out and was able to send some of the purchased parts that weren't needed back for credit.

Total gear swap cost for my 2.29 to 3.73 gears:
$0.00 Gears I already had from the axle from my cousins' S-10 he wrecked.
$25.00 plus or minus a couple bucks, for the new pinion nut, pinion shaft seal, crush sleeve, cover gasket, gear marking compound, and axleshaft seals.
$60.00 plus shipping, for the new correct gears and everything else necessary to correct my speedometer.
$0.00 transmission tailshaft housing O-ring I changed while housing was removed to change speedo gears, thanks to my local tranny shop.

Plus an immense amount of information gained from internet searches for information on how to set up a ring and pinion properly.

Last edited by M&M CUSTOM; 07-28-2004 at 06:11 PM.
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Old 07-29-2004, 10:50 PM
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gear installation

You assume that everone has a press to change the pinion shim to set the pinion depth properly.


Quote:
Originally posted by M&M CUSTOM
UNTIL you pay someone to put those gears in for you.

Or, like I did put them in yourself and save a BIG bundle of cash in doing it.
I even lucked out and was able to send some of the purchased parts that weren't needed back for credit.

Total gear swap cost for my 2.29 to 3.73 gears:
$0.00 Gears I already had from the axle from my cousins' S-10 he wrecked.
$25.00 plus or minus a couple bucks, for the new pinion nut, pinion shaft seal, crush sleeve, cover gasket, gear marking compound, and axleshaft seals.
$60.00 plus shipping, for the new correct gears and everything else necessary to correct my speedometer.
$0.00 transmission tailshaft housing O-ring I changed while housing was removed to change speedo gears, thanks to my local tranny shop.

Plus an immense amount of information gained from internet searches for information on how to set up a ring and pinion properly.
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Old 07-30-2004, 07:37 AM
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PRESS???????

Troy
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Old 07-30-2004, 07:48 PM
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Re: gear installation

Quote:
Originally posted by ca434sbc
You assume that everone has a press to change the pinion shim to set the pinion depth properly.
I never assume.
Many machine shops cannot be found WITHOUT a press, work a deal with the owner if the 1 hour labor rate is too much for you.

There are great deals to be found when it comes to using someone elses equipment, if you don't become too dependant on their help.

Think about it, there are not as many adjustments to be made when installing a set of gears, as compared to rebuilding an engine.

A press is only really needed to install the bearings, bearing races, and on many axles the axleshaft bearings.

Or the ever un-popular redneck method of BFH and good luck.
---------------------------------------------------------------
Besides, when I changed my gears earlier this month, I used a complete set-up from antother axle.
Just out of curiousity I installed the pinion gear with the existing bearings and races, and the gear mesh pattern required me to luck out and use the factory bearing spacers from the existing axle AND the donor axle to get a very acceptable pattern that was visually checked by two other people besides myself, and compared to pictures of patterns found on a couple different websites.
I had already purchased everything I would have needed to make the required adjustments in case they were needed.
I lucked out, and sent many of the un-necessary parts back for credit for things I could use.

Last edited by M&M CUSTOM; 07-31-2004 at 05:21 AM.
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