Gear ratio - Impala Tech
Transmission & Driveline Transmissions & Differentials

 
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post #1 of 17 (permalink) Old 08-30-2009, 09:15 PM Thread Starter
 
 
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Gear ratio

I have a 65 impala with a 250hp 327/glide with a 12 bolt rear end. What gear ratio would I have? It is all numbers matching drive line. The car has no bottom end but goes like hell on the highway.
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post #2 of 17 (permalink) Old 08-30-2009, 10:13 PM
Ape
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There are over 40 rear axle options on the 65 passenger car. Any numbers you can get off the axle would be great.

Ape Out.

Make: Chevrolet
Model: Impala Custom
Year: 1969
Doors: 2
Engine: 327 V8
Trans: Powerglide
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post #3 of 17 (permalink) Old 08-30-2009, 10:27 PM
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the ratio should be stamped on passenger side rear of axle tube, from under car you will be looking toward the rear of the car. I changed the glide to a 350 That makes a world of difference on take off.
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post #4 of 17 (permalink) Old 08-31-2009, 10:23 AM
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Whenever I have taken out a Rear of that type, it's always been a 2.73. The way you have described it also sounds like a 2.73, but as stated above, it's best to check out the numbers to be sure.

Bill
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post #5 of 17 (permalink) Old 08-31-2009, 10:26 AM
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Quote:
Originally Posted by Ape View Post
There are over 40 rear axle options on the 65 passenger car.
40?

I only know of about 6 available ones. You wouldn't have a list of those would you?

Bill

Last edited by 62BillT; 08-31-2009 at 11:01 AM.
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post #6 of 17 (permalink) Old 08-31-2009, 07:10 PM
Ape
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3.01:1
3.36:1
3.55:1 H.D. (4 link suspension)
3.31:1
Taxi/Police 3.31:1
Posi 3.07:1
Posi 3.08:1
Posi 3.31:1
Posi 3.36:1
Posi 3.55:1
Posi 3.55:1 H.D. (4 link suspension)
Posi 3.70:1
Posi 3.73:1
Posi 4.10:1
Posi 4.56:1
Posi 4.88:1
3.55:1
Metal brakes 3.07:1
Metal brakes Posi 3.07;1
Metal brakes 3.08:1
Metal brakes Posi 3.08:1
Metal brakes 3.31:1
Metal brakes Posi 3.31:1
Metal brakes 3.36:1
Metal brakes Posi 3.36:1
Metal brakes 3.55:1
Metal brakes Posi 3.55:1
Metal brakes 3.70:1
Metal brakes Posi 3.70:1
Metal brakes 3.73:1
Metal brakes Posi 3.73:1
Metal brakes 4.10:1
Metal brakes 4.56:1
Metal brakes 4.88:1
All w/overdrive 3.70:1
All w/overdrive 3.73:1
3.07:1 H.D. (4 link suspension)
Taxi/Police 3.07:1
Taxi/Police 3.55:1
2.73:1 H.D. (4 link suspension)
Posi 2.73
Metal brakes 2.73:1
Metal brakes Posi 2.73:1

Ape Out.

Make: Chevrolet
Model: Impala Custom
Year: 1969
Doors: 2
Engine: 327 V8
Trans: Powerglide
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post #7 of 17 (permalink) Old 08-31-2009, 09:44 PM
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Hmmm, I wonder what I have? Mine is the 250HP (assumed due to single exhaust/Carter 4bbl) 327, Powerglide combo as well...

I should be able to read the axle. The car has no rust at all...
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post #8 of 17 (permalink) Old 08-31-2009, 09:50 PM
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Assumeing it isd untouched. It will be stampped in the middle of the forward facing passenger side tube. A Letter Six numbers and another letter.

Big Dave
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post #9 of 17 (permalink) Old 08-31-2009, 11:20 PM
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Lawrence,

I was referring to the ratios themselves, but I have to say that that is an impressive list. There is also a couple on there that I wasn't aware of. Did not know that you could get a 4.88 from the factory. Also a little puzzled to why that had some right close to one another (ie: 3.07 and 3.08).

Bill
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post #10 of 17 (permalink) Old 08-31-2009, 11:22 PM
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I know, 13 different ratios in 43 different combinations.

Ape Out.

Make: Chevrolet
Model: Impala Custom
Year: 1969
Doors: 2
Engine: 327 V8
Trans: Powerglide
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post #11 of 17 (permalink) Old 09-01-2009, 08:34 PM Thread Starter
 
 
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WOW guys that's a lot of info. Thanks. I will check the axl tube to see what I have. Any thoughts on putting a 700r4 in place of the glide?
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post #12 of 17 (permalink) Old 09-01-2009, 09:57 PM
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hell yeah, do it! hate the 'Glide, hate it with a passion!

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #13 of 17 (permalink) Old 09-02-2009, 12:23 AM
Ape
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Quote:
Originally Posted by BLACK65 View Post
WOW guys that's a lot of info. Thanks. I will check the axl tube to see what I have. Any thoughts on putting a 700r4 in place of the glide?
That is route I am going.

Ape Out.

Make: Chevrolet
Model: Impala Custom
Year: 1969
Doors: 2
Engine: 327 V8
Trans: Powerglide
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post #14 of 17 (permalink) Old 09-03-2009, 12:16 AM
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Quote:
Originally Posted by 62BillT View Post
Lawrence,

I was referring to the ratios themselves, but I have to say that that is an impressive list. There is also a couple on there that I wasn't aware of. Did not know that you could get a 4.88 from the factory. Also a little puzzled to why that had some right close to one another (ie: 3.07 and 3.08).

Bill
3.07 is a 12 bolt gearset and 3.08 is for the 10 bolt. Of that list, I believe the 12 bolt ratios are:
2.73, 3.07, 3.31, 3.73, 4.10, 4.56 and 4.88
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post #15 of 17 (permalink) Old 09-03-2009, 09:00 AM
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ratio

You forgot 3.55 on the 12 bolt too and the 3.90...

I would say with a glide you have 2.73 or 3.07 ratio.

But as stated you will need to axle code 2-3 letter suffix code or you can open the rear and check the pinion head it will also have the ratio stamped into it by listing the ring tooth count and the pinion tooth count and part number of the pinion gear plus the date usually. Jim

J D RACE & RESTORATION
Richfield, Oh
JDRACE.COM
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post #16 of 17 (permalink) Old 09-03-2009, 01:56 PM
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Quote:
Originally Posted by Splitter View Post
3.07 is a 12 bolt gearset and 3.08 is for the 10 bolt. Of that list, I believe the 12 bolt ratios are:
2.73, 3.07, 3.31, 3.73, 4.10, 4.56 and 4.88
Appreciate the explanation between the 10-Bolt/12-Bolt differences.

Makes more sense now.

Bill
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post #17 of 17 (permalink) Old 09-06-2009, 02:00 PM Thread Starter
 
 
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Thanks for all the info, Looks like i'm going with the 700r4 over the winter.
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