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3 speed manual shift transmission

Posted: Sun Sep 06, 2020 2:48 am
by Benny
Hi Guys
I've got a 64 202 base with a 260 with 3 on the tree. It runs good shifts good but it feels like I need another gear to shift into. Well...I recently bought a 1967 289 with a 3 speed manual transmission. My Question is ; when I swap out the motor & tranny's, will that give me a higher speed in 3rd gear ?...or all 3 speeds the same gear ratio ?

Re: 3 speed manual shift transmission

Posted: Sun Sep 06, 2020 3:46 am
by lavron
Benny wrote:
Sun Sep 06, 2020 2:48 am
when I swap out the motor & tranny's, will that give me a higher speed in 3rd gear ?...or all 3 speeds the same gear ratio ?
3rd gear is 1:1 as is 4th gear in a 4 speed, the only way to get a higher ratio is with an overdrive.

Might look into different rear gear ratios, someone will have a suggestion I am sure.

See Ya,
Mike

Re: 3 speed manual shift transmission

Posted: Sun Sep 06, 2020 11:09 am
by SASSY
With the additional hp and torque available in the 289
you may want to consider a shorter rear gear for lower rpm at highway speeds.
When I had a 289 4 speed with a 3.25 rear gear it seemed like a great combo, decent off the line and would run the Speedo needle off the the end.
Fred

Re: 3 speed manual shift transmission

Posted: Sun Sep 06, 2020 3:37 pm
by Benny
Thanks Mike & Fred.,.I've got some work to do 👍

Re: 3 speed manual shift transmission

Posted: Sun Sep 06, 2020 3:58 pm
by SASSY
3.25 gear was pretty popular in our cars and yours may already have it. If I remember correct 60 mph was like 22-2300 which I think is fine for those motors.
A taller tire would also help reduce highway rpm, and add to the cool look factor,,imo
Fred

Re: 3 speed manual shift transmission

Posted: Sun Sep 06, 2020 9:15 pm
by Jims65cyclone
Look on your warranty plate on the driver's door. There should be a field under the heading "axle", and there should be a number in that field that tells you what the axle ratio is.
Rear Axle Codes
Code (Conventional) Ratio
1 3.00:1
2 2.83:1
3 3.20:1
4 3.25:1
5 3.50:1
6 2.80:1

Jim