switch to auto - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 12 Old 08-31-2016, 10:18 PM Thread Starter
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switch to auto

Just contemplating on switching to an auto. Current setup is a 306, AFR 185, TFS stage1 cam, 72mm turbo, a tremec 3550, 3.55 gear, #3,000 car. I'm absolutely clueless about auto's. What is a good setup to run? Im wanting a transbreak, somewhat streetable, able to handle max 700hp but more likely in the 550-600 range. Overdrive would be a nice bonus.

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post #2 of 12 Old 09-01-2016, 10:11 AM
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Go with a 4r70w. It really doesn't take much for them to handle that kind of power. I made the switch from a TKO to the auto and have no regrets. It has been the best upgrade that I have done to the car.

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93 Cobra, Dart 408, Holley efi, and a 4r70w.

1/8th 6.46 @ 106.5 mph 3600lb race weight
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post #3 of 12 Old 09-01-2016, 02:34 PM
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Got to agree. Ditching the TKO for a powerglide was a great upgrade.

1993 Teal Cobra #2531 1 of 452, 347, Precision 7675, The entire kitchen sink....maybe 2 kitchen sinks at this point!
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post #4 of 12 Old 09-01-2016, 05:06 PM
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Got agree as well. Ran a manual for 26yrs. Switched to a C4 last year and won't look back. Much easier to setup the suspension for an auto as well. When you start making good power manuals become just too violent, well at least in my case. My brother owns a blown 98 cobra and will be making the switch from his TKO500 to a C4 as well.

-90GT (Original owner MM&FF 7/13)-CHP 349 Stroker, Paxton Novi2000, Ben Alameda Ported Twisted Wedge Heads, Ben Alameda Ported Cobra Intake, Comp Cam, Snow Performance Stage 2 Meth Kit, BE Tuned
-92 SSP Coupe- GT40 Heads, E303 Cam, TFS intake, Nitrous Express Proton Kit
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post #5 of 12 Old 09-02-2016, 05:59 PM Thread Starter
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I've seen many people having good luck with the 4R70W. What's models are sought after when going into a fox with a 302?
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post #6 of 12 Old 09-03-2016, 01:37 PM
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99-04 3.8 v6 or 4.2 truck v6. Just make sure it has a mechanical speedometer output in the tail shaft. Some 02-04 models didn't have a mechanical speedometer.

93 Cobra, Dart 408, Holley efi, and a 4r70w.

1/8th 6.46 @ 106.5 mph 3600lb race weight
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post #7 of 12 Old 09-03-2016, 03:01 PM Thread Starter
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Is the 4R70W computer controlled? If so can it be controlled by an A9L, or will it need a secondary computer?
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post #8 of 12 Old 09-03-2016, 10:57 PM
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Quote:
Originally Posted by Novi347 View Post
When you start making good power manuals become just too violent,
This is true, and to add to this I personally think that if the car is street driven, the converter "slippage" at lower speeds gets old, especially in stop & go traffic. Then it becomes a case of having a race car that you drive on the street, meaning you give some comfort for reliability and ease of use.

Lot of guys using 4R70W's successfully. Look for one out of a '03 or '04 Mustang V6, or 4.2L pickup trucks. They are expensive if built properly but so is everything else these days.

'92GT, 427" and '93 "LXVO" coupe
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post #9 of 12 Old 09-04-2016, 11:00 AM
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You can install a manual valve body and put the overdrive and lockup on a switch, or buy a transmission controller.

93 Cobra, Dart 408, Holley efi, and a 4r70w.

1/8th 6.46 @ 106.5 mph 3600lb race weight
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post #10 of 12 Old 09-04-2016, 11:10 AM
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With a quality converter the slippage at low rpm is a non issue. I have a 8" UCC 5600 rpm stall in my car. It is very tame and you can take off from a stop light like any other car. It will literally start moving as soon as my rpms increase from idle and accelerate smoothly to redline. I do not have any of the low speed "slippage" like some of my prior cars that had a lower quality converter. My car is 10x more streetable with the auto than the TKO ever was.


93 Cobra, Dart 408, Holley efi, and a 4r70w.

1/8th 6.46 @ 106.5 mph 3600lb race weight
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post #11 of 12 Old 09-05-2016, 02:24 PM
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My powerglide (Ultraglide) is smooth in city traffic.
Heard (read on the Internet) that you can not use a 2 speed transmission for a street car.

That is simply not accurate. I will add, the converter becomes key to the success.
Plus it's rated by the builder to hold 3,500#/ft. Significantly more than I will ever be able to throw at it.

1993 Teal Cobra #2531 1 of 452, 347, Precision 7675, The entire kitchen sink....maybe 2 kitchen sinks at this point!
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post #12 of 12 Old 09-05-2016, 05:13 PM
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Heard (read on the Internet) that you can not use a 2 speed transmission for a street car.

That is simply not accurate.

Yup. And a lot of the same people will tell everyone that a PG will slow you down. Neither have been the case on my end, but having overdrive is sure nice. I'm more of a stick-shift guy and that's the direction I'm going with my project, and I do have experience (plenty actually) with stalled auto's, never had one that I liked for a street car, other than a 4R70W but I still prefer the manual shift choose your own stall speed.

For high power and manual shift, the clutch has everything to do with the entire setup.

'92GT, 427" and '93 "LXVO" coupe
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