Need help with transmission - Vintage Mustang Forums
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post #1 of 12 (permalink) Old 08-28-2018, 08:56 AM Thread Starter
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Need help with transmission

Hello everyone, so yesterday taking my car to get my exhaust welded up my c4 trans decides itís not going to go into reverse anymore. Drive works fine. Did a little research from what I found the rear servo ring is split causing I guess no pressure? Little back history trans is an original rebuilt about 9 years ago. Shift kit was installed and a 2200-2600 stall converter was also. My problem is do I jerk around with this trans or buy a new race trans thatís warrantied and is built for the engine thatís in the car. If I do replace it what would you recommend for high performance applications say 4-600hp, plan is to install a Paxton this winter. Also the stall converter what should I match my 3.55 gears with. I have no clue about what works I just know enough to get in trouble🤓
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post #2 of 12 (permalink) Old 08-28-2018, 11:36 AM
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4r70w

17 Mustangs owned to date!


1967 Mustang Convertible
2014 Mustang Fastback
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post #3 of 12 (permalink) Old 08-28-2018, 12:01 PM
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Agree - 4R70W
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post #4 of 12 (permalink) Old 08-28-2018, 12:18 PM Thread Starter
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4r70w
What does it take to put one of these in a 1970 Mustang?
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post #5 of 12 (permalink) Old 08-28-2018, 12:48 PM
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What does it take to put one of these in a 1970 Mustang?
Quite a bit... You will need an electronic controller for starters. Performance Automatic Smart Shift Transmission Controllers PA99102
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post #6 of 12 (permalink) Old 08-28-2018, 01:28 PM Thread Starter
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Yikes thatís a set back. I spoke to JEGS this morning they recommended Performance Automatics c4 runs 1600 plus frieght, I have to call them back later with cam specs to see if torque converter is sized right.
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post #7 of 12 (permalink) Old 08-28-2018, 04:16 PM
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Why not just repair the servo?
You can probably do it yourself without dropping the transmission.
Or drop the transmission, put in a TCI breakaway torque converter, repair the servo(s) with new o-rings and billet aluminum covers, then put the trans back in.

1970 Mustang coupe
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post #8 of 12 (permalink) Old 08-28-2018, 04:24 PM
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Looks like the TC you already have is in the same range as the Breakaway. So you probably won’t need a different TC.
A C4 is great for drag racing. The 4r70w is good for cruising on the street.
If you don’t need overdrive, stick with the C4

1970 Mustang coupe
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post #9 of 12 (permalink) Old 08-28-2018, 04:29 PM Thread Starter
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Why not just repair the servo?
You can probably do it yourself without dropping the transmission.
Or drop the transmission, put in a TCI breakaway torque converter, repair the servo(s) with new o-rings and billet aluminum covers, then put the trans back in.
Yea Iím pretty sure itís a tci torque converter, is there any info on changing that servo I havenít found much except for what symptoms were.
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post #10 of 12 (permalink) Old 08-28-2018, 05:56 PM
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The reverse servo and band are also used for 1st gear.

https://youtu.be/As5lBDy107c


Bad Shoe Productions How To Video Series - Ford Transmissions & Rears, 1970 & up C4

David
VMF Build Thread - 1969 Shelby GT350 Hertz rebuild Gallery
Used by Hertz for the 1969 "Rent-A-Racer" program at Miami Internation Airport.
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post #11 of 12 (permalink) Old 08-28-2018, 11:27 PM
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In any case, if you decide to do something with the C4 then a teardown is in order. You can hope for something simple, but I've seen my share of bad reverse drums...

Bart

What, me worry?
- Alfred E. Neuman

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post #12 of 12 (permalink) Old 08-29-2018, 06:57 PM Thread Starter
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Today I ordered the PA super Streeter and going to install that once it comes in. Build time is 7-10 days plus shipping. I guess weíll see how it turns out
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