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Author Topic: 4speed toploader with overdrive...  (Read 5854 times)

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Offline dave1987

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4speed toploader with overdrive...
« on: April 17, 2012, 07:36:22 PM »
There is an early 80s Mustang at a junkyard here with a 4 speed transmission and the knob has an "O/D" marking on it, so, an overdrive gear. Is this the SROD transmission I have heard of?

If so, I was thinking of pulling it and putting it in my 78 on the 2.3L motor, hoping to get some freeway cruising RPM back.

Right now I have the stock 4spd in the car with a 3.00 geared rear axle and at 65mph I'm pulling 3000 RPM, where as when I had the 2.73 gears in the stock axle it was pulling 3000 RPM at 75mph and 65mph was more like 25-2700 RPM (somewhere in that range).
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Offline D.R.Ball

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Re: 4speed toploader with overdrive...
« Reply #1 on: April 17, 2012, 10:55:43 PM »
It might be a 5 speed...

Offline dave1987

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Re: 4speed toploader with overdrive...
« Reply #2 on: April 18, 2012, 12:49:16 AM »
I was initially thinking the same but the gear layout is the same as the stock Pinto 4spd, with the overdrive/fifth gear in the lower right next to fourth, which I found interesting.
1978 Ford Pinto Sedan - Family owned since new

Remembering Jeff Fitcher with every drive in my 78 Sedan.

I am a Pinto Surgeon. Fixing problems and giving Pintos a chance to live again is more than a hobby, it's a passion!

Offline Reeves1

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Re: 4speed toploader with overdrive...
« Reply #3 on: April 18, 2012, 05:41:41 AM »
Isn't the top loader a heavy trans, with big input/output shafts ?

I am going to use a super T-10 in my white car. Not worried about a 5th gear though.

If you want better milage, it would likely be cheaper to change the diff gearing.

Offline racer99

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Re: 4speed toploader with overdrive...
« Reply #4 on: April 18, 2012, 10:29:54 AM »
Ford called the 5 speed a RAP,
No toploaders in 80s cars.

Got a parts breakdown if you need it,Dave.

Offline OhSix9

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Re: 4speed toploader with overdrive...
« Reply #5 on: April 18, 2012, 05:32:22 PM »
don't wast your time with that junk.  there are plenty of cable actuated t5's in fox body 4 banger mustangs from 87-94 that will pay off far better and give you a much nicer pick a gear.   Plus full blown t5 rebuild kits can be had for under 300 bucks on ebay
Modest beginnings start with the single blow of a horn man..    Now when you get through with this thing every dickhead in the world is gonna wanna own it.   Do you know anything at all about the internal combustion engine?

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Offline fast64ranchero

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Re: 4speed toploader with overdrive...
« Reply #6 on: April 18, 2012, 07:44:20 PM »
Dave, it is a top loader, Ford made and installed thousands of SROD's and put then in everything from Fairmonts to Mustangs to Ganada's, with  4 bangers to V-8's it's a good stout tranny, I've use them in the past, the problem is there is a big step between 2 and 3, with 4th being a overdrive, it makes 3rd gear 1 to 1.  If it's real cheap maybe, other wise wait for a good deal on a T-5.
Walt
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Offline racer99

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Re: 4speed toploader with overdrive...
« Reply #7 on: April 19, 2012, 08:11:46 AM »
What is usually reffered to as a toploader is the Borg Warner trans.
Old school style shifter assy.

The SROD does also load through the top and it is a Tremac.

http://www.5speeds.com/toploader.html

Offline fast64ranchero

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Re: 4speed toploader with overdrive...
« Reply #8 on: April 19, 2012, 09:13:31 PM »
Call it whatever you want, some even call it a RUG,  it's still a top loader, it's still a 4 speed overdrive, 3rd gear is 1 to 1,  4th gear is 0.82 (if I remember right) ratio and it has a huge gear split between 2 and 3. is it junk? no, it's ok tranny. Would I use it behind a N/A 2.3? prob. not, I'd use taller tires,  a T-9 or a T-5
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Offline vonkysmeed

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Re: 4speed toploader with overdrive...
« Reply #9 on: April 19, 2012, 11:30:56 PM »
if an 82 gt and a 4 speed.  good chance it is a srod.  the 5 speed did not start until 83.

the srod is essentially an aluminum top loader with an overdrive of .71.

it works great behind my 351w
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