best gears for AOD turbo fox - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 11 Old 05-16-2018, 09:04 AM Thread Starter
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best gears for AOD turbo fox

hey all, ive got a 91 notch AOD car. this thing is a dog pretty much all stock. im ordering up a turbo kit, and a few other supporting things for it. just curious on best rear gear ratio for a turbo foxbody with an AOD. i know the rule of thumb is usually 4.10 aod and 3.73 t5 cars. ive done some research and most people seem to stay with either stock 2 something gears or go to 3.55 when turbo'ing the car.. this car is not a DD and driven on weekends around town. was thinking of doing a 2800-3k Stall non lock up converter and 3.55's and full manual VB... anyone have any input on that decision ? thanks!

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post #2 of 11 Old 05-16-2018, 09:21 AM
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3.27 or 3.31's... Also gut that AOD and fill it with all 4r70 internals with a 1pcs input, good valvebody and of coarse a good converter.

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'89 TTGT 306, canfeilds, F-cam, 1.6rr, edelbrock perf intake, 76 C&L, 65mm TB, 42# inj, self fab'd twin T60's, MSD 6AL, stock ECU(no chip/ piggyback), home built C4, 3.50 gears, 9", 27X10.5's, 3500#, 9.94/136mph on 14psi
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post #3 of 11 Old 05-16-2018, 11:06 AM
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I have 2.73's and first never hooks, second sometimes hooks up top, and I'm on an ET Street Drag Radial. OD drops RPMs nice and low for highway use. If I was going to hit the track a bunch, I'd probably do a 3.27, and still might consider doing this down the road.
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post #4 of 11 Old 05-17-2018, 03:04 AM
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Figure out your speed at the end of the track and gear accordingly, BTW I ran 3.73 but only ran 1/8 mile and hit the traps at 6800
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post #5 of 11 Old 05-18-2018, 04:27 PM
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3.27s

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #6 of 11 Old 05-31-2018, 04:01 AM
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3.27 here, 89 Notch, Dart 331, 76mm midframe
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post #7 of 11 Old 05-31-2018, 08:10 AM
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I read someplace that 3.31's have the lowest friction losses and best power through put. In the search for every last MPG to satisfy the Fed's, I'd believe it. Anyway, I'd be looking at 3.27's or 3.31's.

Also, with a turbo, I don't know as if the 4R70W internals are worth the effort. N/A or supercharged I would say it's worth doing. Everything I've read says turbo like to be loaded. The AOD gearset will load more than the 4R gearset with the same ring and pinion out back.
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post #8 of 11 Old 06-02-2018, 08:26 PM
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If you drive on the highway a 3.55 would be a good compromise.

A 3.55 would put you at 45mph at 6000 rpms in 1st gear. That's about the same as a 3.27 on a 5-Speed TKO. 2nd would put you at 83mph at 6k compared to 71mph on a TKO with a 3.27.

You'll definitely cross the finish line in 3rd, so if that's you're main goal than a gear that puts you near your peak power thru the line is where it's at like others have said. BTW, you need less Camshaft with a Turbo. Don't go to big.

Here's an easy Calculator. YOu can drag the slides to see where you're mph would be..

https://www.blocklayer.com/rpm-geareng.aspx
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post #9 of 11 Old 06-04-2018, 04:41 PM
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The gear depends on your finish line MPH and RPM, if you can manage boost, and how your car hooks. It also depends on low gear ratio and your torque converter.

What works for one person's system might not be good for another.

I run a 4.10 gear but my car is a different car than yours.

If I were in your shoes I would run the car with the gear it has and see where I was at. It's a little silly to change gears just on a wild guess. Build it, tune it, see where you are at. The manual valve body will be fine.

The higher stall with a turbo means a lot more than any rear gear change you will make. You will probably be fine except for the carrier and the axles. I would be wanting some 31 spline axles more than a gear. Those 28 splines are pretty weak in the carrier and real weak in the axle.
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post #10 of 11 Old 06-23-2018, 04:13 PM
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I built a twin turbo 393w and decided to go with 3.31ís, Iím running a Lentech Strip 4r70w, havenít made it out of on the road to give a real world review yet FWIW.

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post #11 of 11 Old 06-23-2018, 07:58 PM
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I have 347 with a built 4R70W, 76 mm turbo and a 9 inch in my car. I have run a 3.50. 3.25 and now a 3.80. I like the 3.80 the best. The car is more fun, feels stronger and gets better milage with the 3.80.

93 Mustang Coupe, Turbocharged Dart 331, 4R70W, Moser 9in, Haltech, Flexfuel
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