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Old 05-17-2013, 05:29 PM   #11
wgc68nyc
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Vehicle: 1968 Ford Mustang
Location: NY
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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, 11:05 PM   #12
imboden
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Vehicle: 67 Coupe.. 289
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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, 09:09 PM   #13
Stangatic
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Vehicle: 1966 Ford Mustang
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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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1966 289 Mustang coupe, Sahara Beige w/ black interior: Tuff Dawg Engines 302/ 375hp 393tq w/ Comp Cams ***** Thumpr 287TH7 Cam. Ported, Polished, 3 angle valve job, Performer RPM casting heads. 9.5 comp ratio. Edelbrock 650 AVS carb. Promotion Powertrain 295SHD T-5. Gt spec suspension. Pacer 15" wheels.

2000 Gt convert ***SOLD*** :*(
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Old 05-23-2013, 06:16 PM   #14
Greg West
 
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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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Old 05-23-2013, 06:16 PM
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