Correct Gear Size - Team Camaro Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 19 (permalink) Old Apr 17th, 19, 02:20 PM Thread Starter
Apprentice
 
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Correct Gear Size

Hello, I have a decision to make and would like your opinions, I have a 68 camaro with a very well built 350 engine, TH350 with shift kit and 2500 RPM stall converter, I'm now building my rearend with mosier posi and need a opinion on what gear, 411(410) vs 373 gears
I drive it occasionally to car shows and around town some. Not a daily driver but I want to take full advantage of hp I have in motor. I had another 68 camaro years ago and I had 12 bolt posi with 411 gears and it ran great but I had a 2 speed powerglide in it. I've had some tell me 411 would be too low in this car being it has a TH350. What's your opinion??
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post #2 of 19 (permalink) Old Apr 17th, 19, 02:48 PM
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Dave
 
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Re: Correct Gear Size

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411 gears and it ran great but I had a 2 speed powerglide in it.
Some are not aware that the final gear ratio is 1:1 in both the PG and the TH350, so both cars will react the same with the 4.10/4.11 gear (two different gears with a different number of teeth on the ring and pinion).

I doubt if you don't drive it much if you would notice the difference between a 3.73 and the 4.10/4.11.

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post #3 of 19 (permalink) Old Apr 17th, 19, 04:14 PM
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Re: Correct Gear Size

If you are ever going to get this out on the highway you will not like either of those ratios. Something in the 3.36-3.23-3.31 would be much better and still perform well.

'69 RS/SS396 pro street/427/4spd/9"

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post #4 of 19 (permalink) Old Apr 17th, 19, 07:13 PM
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I have a 68 with a 3 speed th350 and 12 bolt posi. It had 4.10s that I geared up to 3.42. I had a shop do the change and for the money it wasn't worth it to go any lower than the 3.42. its so much nicer to drive above 50 mph now.
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post #5 of 19 (permalink) Old Apr 17th, 19, 07:27 PM
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Big gear head is not far off. Done the 4.10, and the 3.73 thing. If I had to do it again , j would not go over 3.55. Just my thoughts.

X-77 keith
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #6 of 19 (permalink) Old Apr 17th, 19, 08:36 PM
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Re: Correct Gear Size

What you do not mention is how big of a tire you are running.
My Camaro with 4.10's & a 26" tire is miserable on the highway... at 3500rpm cars are still passing me.

If you drive to shows less than 20mi away & want performance, then 4.10's it is.
If you want to drive over an hour, you should consider less gear.

My best advice is to go with 4.10's & get a 700R4 trans. It will transform the car.
It's like a 2.88 on the highway plus a killer launch. I drove my Nova everywhere including 150mi plus trips with a 700R4 & 4.56's, although I admit the first gear was a little steep... unless you not afraid to rev it high.
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post #7 of 19 (permalink) Old Apr 18th, 19, 05:33 AM
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Re: Correct Gear Size

Quote:
Originally Posted by x-77 keith View Post
big gear head is not far off. Done the 4.10, and the 3.73 thing. If i had to do it again , j would not go over 3.55. Just my thoughts.
x2.

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post #8 of 19 (permalink) Old Apr 18th, 19, 02:51 PM
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Re: Correct Gear Size

4.10's 65mph 3500ish rpm....gets old quick anymore (guess I'm getting there too?)


68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #9 of 19 (permalink) Old Apr 18th, 19, 05:06 PM
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Re: Correct Gear Size

3:73, 3000 RPM, 60 MPH w/26" tire

68 302 M20 - 85 IROC Z
The older I get the faster I was.
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post #10 of 19 (permalink) Old Apr 18th, 19, 05:24 PM
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Re: Correct Gear Size

You’ll miss it.

69 COPO clone, 461" BBC 11.25:1 Compression
840 Rec Heads (2.25/1.88) AED 850 HO carb
Orig Exhaust Manifolds
Straub (Clay Smith) cam, 288/300 .600/.569 109.
TH400, 3500 stall, 4.11 12 bolt posi
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post #11 of 19 (permalink) Old Apr 19th, 19, 07:29 AM
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Re: Correct Gear Size

there are online calculators you enter your tire size and rear gear ratio and it will tell you what your RPM is. On transmissions with a final gear ratio of 1:1 (Powerglide, Turbo 350, Muncie 4 speed) the RPM's will be the same. Overdrive transmissions allow more rear end gear as they are generally .75:1 and a T56 .50:1

I have a T56 with 4:10's in another car running a 27" tire and at 80 MPH I am 19xx RPMs in 6th

700R4 is a OD automatic but it has a HUGE gap in ratios between 1st and 2nd gear

I had 3:73 in a Powerglide car and the RPM's at 80 mph were stupid. Yeah it was fun stop light to stop light. Put in 3:08 I had and a Turbo 350 and , for me, the car is good on acceleration yet not stupid RPM's at 75 mph. I drive the car long distances
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post #12 of 19 (permalink) Old Apr 19th, 19, 08:13 AM
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Re: Correct Gear Size

I had 3.55's when I had my TH340 in and it was ok, but too much with the increased speeds on the highways now. I have 3.73's now but I also have a 4L70E with OD and it is great. I would hate driving it if I didn't have OD if I went on the highway at all.

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1987 Iroc-Z (sold)
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post #13 of 19 (permalink) Old Apr 19th, 19, 08:23 AM
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3.55 is borderline if you do any driving on the interstate highways.
You’ll be in the slow lane. I’ve had two cars with no OD and 3.55. Just going a few exits on the highway was all I did, or would want to. If you don’t do much 65mph and up cruising, put in what you like.

I have friends with the same 3.50ish gears (ford/gm rears )and no OD. We try to keep back road cruises under 65 just for them.
Half of us run 5/6 spd. With 3.50 and up gears. I’m going from 3.50 to 3.70 right now.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
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post #14 of 19 (permalink) Old Apr 19th, 19, 09:38 AM
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Quote:
Originally Posted by scblucam View Post
3:73, 3000 RPM, 60 MPH w/26" tire
Yup, that's why I went TKO. I am now doing close to 2600 @80 mph. 235-60-15 tire.

X-77 keith
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #15 of 19 (permalink) Old Apr 19th, 19, 11:10 AM
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Re: Correct Gear Size

10.9.9.-1 540 horse sb engine, 26" tire. 3:55 gear. Muncie 4 speed with a gear vendor over drive
55 mph in od =1900 out =2300
60 mph in od =2000 out =2600
70 mph in od =2300 ,,,,,,,,,,,,,,
80 mph in od =2600,,,,,,,,,,,,,,,
I get 13.5 to 15 mpg depending on my foot
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