What gears should I get for my 68 mustang - Page 2 - MustangForums.com

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Old 05-17-2013, 04:29 PM   #11
2nd Gear Member
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Join Date: May 2011
Location: NY
Posts: 183

As a guy in the same boat with the same setup I wouldnt bother till you do your transmission (exchange for AOD or 5 or 6 speed manual).

With a stock engine unless you go up to high gears you won't notice it that much. With high gears the highway stuff will suck (I do long distance on highways).

What I would and did do is find out the rpm range you like to be on the highway at cruising speed. The use the gear calculators to match that up to the MPH you would like to be going (65 70 75) and then use the AOD or T5 or T6 gearing to back into what rear gear you can get.

Be aware that your other shift points will change so spend some time on this otherwise you could end up in the wrong RPM range or gear other times.

Me personally:

aod c4
First: 2.40:1 1st 2.46
Second: 1.47:1 2nd 1.46
Third: 1.00:1 3rd 1.0
Overdrive: 0.67:1

3.4 in aod 2061 @ 70mph....maybe go a little higher
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Old 05-20-2013, 10:05 PM   #12
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Join Date: May 2010
Location: Wa
Posts: 80

I did 3:55's with my T5 swap. I'll always wonder what 3:73 would have been, but I'm happy.
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Old 05-22-2013, 08:09 PM   #13
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Join Date: Jan 2008
Location: Maryland
Posts: 530

Don't do 3.80's! It was the worst mistake I made when I had a c4! It took all the fun and drivability out of the car!
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Old 05-23-2013, 05:16 PM   #14
Greg West
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Join Date: Mar 2013
Posts: 10

I have ordered the 3.5. Hopefully the assembly will get here in a couple of weeks and I can get it installed. Thanks for all the comments guys.
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