67rally
10-23-2013, 10:18 AM
I'm thinking about changing the differential gears in my '67 Camaro this winter and would like to hear your suggestions.
I just did a 6.0 LQ9/GTO T56 swap last spring. I did a heads/cam/intake build, 458rwhp/410ftlb. It has an Edelbrock Vic Jr. Intake, so it really likes to wind up, but with the current gearing it feels like a bit of a dog off the line. It's rev limited to 6800rpm. The rear is a '67 12 bolt posi with 3.31's. I'm running a 26.7" street tire (275/40/18). The car will see very little/if any strip time. Mostly street, not a daily driver, plan to do a few Auto-X's with it though.
The GTO T56 is geared as follows: 2.97, 2.07, 1.43, 1.00, .84, .57. Combined with my 3.31's that gives me a 1st gear final drive ratio of 9.83.
Originally I was thinking 3.73's or 3.90's. But I drove my wife's Audi S5 over the weekend and it rips off the line.:evil: From what I could find, her diff gearing is 3.89 and her trans gearing is as follows: 3.67, 2.05, 1.46, 1.13, .92, .78. Giving her a first gear final drive ratio of 14.28.
Now I'm leaning towards 4.10's, 4.30's, maybe 4.56's? Any thoughts? (Not that I'm ever going to race her, but I'm putting out almost 200hp more than her, and would hate to get eaten up from a stoplight).
I just did a 6.0 LQ9/GTO T56 swap last spring. I did a heads/cam/intake build, 458rwhp/410ftlb. It has an Edelbrock Vic Jr. Intake, so it really likes to wind up, but with the current gearing it feels like a bit of a dog off the line. It's rev limited to 6800rpm. The rear is a '67 12 bolt posi with 3.31's. I'm running a 26.7" street tire (275/40/18). The car will see very little/if any strip time. Mostly street, not a daily driver, plan to do a few Auto-X's with it though.
The GTO T56 is geared as follows: 2.97, 2.07, 1.43, 1.00, .84, .57. Combined with my 3.31's that gives me a 1st gear final drive ratio of 9.83.
Originally I was thinking 3.73's or 3.90's. But I drove my wife's Audi S5 over the weekend and it rips off the line.:evil: From what I could find, her diff gearing is 3.89 and her trans gearing is as follows: 3.67, 2.05, 1.46, 1.13, .92, .78. Giving her a first gear final drive ratio of 14.28.
Now I'm leaning towards 4.10's, 4.30's, maybe 4.56's? Any thoughts? (Not that I'm ever going to race her, but I'm putting out almost 200hp more than her, and would hate to get eaten up from a stoplight).