silvrsvt Posted March 5, 2008 Share Posted March 5, 2008 Well with the current focus on improving MPG out of cars, do you think we'll finally see a 6 speed transmission in the GT and also on the new 3.5/3.7L engines for the base models? I'm assuming that Ford could use the transmission out of the Explorer for the autos, but from what I understand, the 6 Speed in the GT500 costs a pretty penny also... Quote Link to comment Share on other sites More sharing options...
IMSA-XJR9 Posted March 5, 2008 Share Posted March 5, 2008 (edited) Unless 6th gear (T56) uses the Viper-Spec .50, I don't see a 6-speed improving MPG enough to make a difference (specific to MPG, but from a strength standpoint I'd choose a T56 all day long). The 3650 in the Mach 1 had a .62 5th gear and so did the T56 in the Cobra. I am not sure what spec the GT500 and newer GT's have for their respective overdrives. I thought the GT's 3650 had a .64 or a .68. EDIT: Also dependent upon rear axle ratio. Mach's have 3.55, new GT's have 3.31 or 3.55, etc. Edited March 5, 2008 by IMSA-XJR9 Quote Link to comment Share on other sites More sharing options...
SysEng Posted March 5, 2008 Share Posted March 5, 2008 Well with the current focus on improving MPG out of cars, do you think we'll finally see a 6 speed transmission in the GT and also on the new 3.5/3.7L engines for the base models? I'm assuming that Ford could use the transmission out of the Explorer for the autos, but from what I understand, the 6 Speed in the GT500 costs a pretty penny also... Word is that Ford is ramping up production of a 6R75 and 6R80 tranny at Livonia. While either one would work in a Mustang, I think Ford should just standardize on the 6R80 and 4V4.6V8 as a single "power module". More bang for the buck for Ford ... and the customer. Quote Link to comment Share on other sites More sharing options...
silvrsvt Posted March 6, 2008 Author Share Posted March 6, 2008 Unless 6th gear (T56) uses the Viper-Spec .50, I don't see a 6-speed improving MPG enough to make a difference (specific to MPG, but from a strength standpoint I'd choose a T56 all day long). The 3650 in the Mach 1 had a .62 5th gear and so did the T56 in the Cobra. I am not sure what spec the GT500 and newer GT's have for their respective overdrives. I thought the GT's 3650 had a .64 or a .68. EDIT: Also dependent upon rear axle ratio. Mach's have 3.55, new GT's have 3.31 or 3.55, etc. The old F-bodies had a T56 with a high 6th gear and where able to pull down high 20s in Highway milage, I'm lucky to hit 24 MPG with my 06 Mustang GT Quote Link to comment Share on other sites More sharing options...
rmc523 Posted March 6, 2008 Share Posted March 6, 2008 I would think with 6-speeds spreading throughout the rest of the lineup, a 6-speed for the Mustang would only be appropriate. Not to mention the performance and fuel economy improvements. Quote Link to comment Share on other sites More sharing options...
IMSA-XJR9 Posted March 9, 2008 Share Posted March 9, 2008 The old F-bodies had a T56 with a high 6th gear and where able to pull down high 20s in Highway milage, I'm lucky to hit 24 MPG with my 06 Mustang GT Yeah, I think the old F-bodies also had the .50 6th gear, but had a 2.66 1st gear vs. a 2.97 1st in the Cobra R T56. I've hit 25 MPG in the Mach on the highway on one trip for a stint, and that's the only time I have ever calculated the Mach's MPG. Seems a nice combination would be 2.97 first and .50 6th T56 for the '10 Mustang. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.