Author Topic: 1977 trans am pontiac 6.6l 4 speed  (Read 417 times)

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Offline Mark67

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1977 trans am pontiac 6.6l 4 speed
« on: March 31, 2019, 07:34:08 PM »
Hello Everyone. I have a 1977 trans am with the Pontiac 6.6l with a factory Borg Warner 4 speed. We are in the process of changing out the carrier in the rear end and are going from a 3.23 gear ratio to a 3.42. I have read that in 1978 that the gear ratio for a 4 speed car was 3.42 not 3.73 as in my car. my question is does anyone know what speedometer gear/gears would be in the manual transmission in a 1978 TA with the 3.42 gear ratio. Thank you for your time. Mark

Offline Aus78Formula

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Re: 1977 trans am pontiac 6.6l 4 speed
« Reply #1 on: April 01, 2019, 02:48:06 AM »
Documentation says 8/21 teeth (Red).
« Last Edit: April 01, 2019, 02:53:43 AM by Aus78Formula »

Offline Mark67

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Re: 1977 trans am pontiac 6.6l 4 speed
« Reply #2 on: April 03, 2019, 11:54:19 PM »
Thank you AusFormula. I was checking on my phone and can't access the site as well as on my computer,  also i see they moved it to the tech forum. I am a newbie at this site so sorry for the late reply.  I do appreciate your time on this. What exact documentation did you find this? I have been looking on the web to no avail. Thanks again. Mark

Offline Aus78Formula

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Re: 1977 trans am pontiac 6.6l 4 speed
« Reply #3 on: April 04, 2019, 12:40:36 AM »
No dramas, fee free to double-check all those details, I'm not heaps familiar with the manual box versions but that's what the manual lists.