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Author
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Topic: Are C-4 and v-8's 3 speed/4speed tranny the same length?
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steve'66
Gearhead Posts: 8796
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 05-29-2001 12:10 PM
   
I know the 3 and 4 speed manuals (v-8) are the same and use the same driveshaft. But is the C-4 auto the same length with the same output shaft? I'm ordering a bigger driveshaft and want to be sure it'll work with an automatic too. Thanks,SteveW p.s. Any suggestions on a 3" dia aluminum shaft with the large u-joints and yoke?
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bob emmerich
Journeyman Posts: 65
From: Stratford,Connecticut
Registered: Sep 2000
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posted 05-29-2001 08:07 PM
I don't believe the output shaft is the same length. I do know that the auto and manual yokes are different though. What you should do is measure the total length from the center of the tailshaft to the center of the pinion flange on the rear diff. and use that measurement to order the driveshaft to length. On my 66 C-4 it's approximately 54.25". The car must be sitting on all 4 tires on the ground when you do the measuring. USE YOUR MEASUREMENT-and remember to tell the shop making the shaft EXACTLY where you measured from so they can make one the correct length. Hope this helps. Good Luck.
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 05-29-2001 11:01 PM
Since my C4 is out here on the back of a motor I hung a tape on it and as near as I can decern it's 30 1/2 inches from the front of the plate (between the motor and the bell) to the tip of the output shaft. I'm measuring straight back with a flat bar on the back of the output shaft.
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TomP
Gearhead Posts: 5726
From: Delta BC Canada
Registered: Dec 99
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posted 05-29-2001 11:12 PM
they are the same length ,only the long shaft tranny from a Galaxie differs. Check newfangled cars driveshafts for length, i found a 93 Crown Vic one that slid right in,it can be shortened for a Mustang. Tom
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sigtauenus
Gearhead Posts: 2205
From: in the RV, moving soon from SC to VA
Registered: Jun 2000
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posted 05-30-2001 04:27 PM
quote:
Originally posted by bob emmerich:
I do know that the auto and manual yokes are different though.
Are you sure about the yokes? I changed a 67 coupe from C-4 to 4 spd about 8-9 years ago and I'm pretty sure I used the same driveshaft for the 4 spd that was on there for the C-4. I specifically remember being suprised it worked and wowing all the interchangability in parts on these cars.
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steve'66
Gearhead Posts: 8796
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 05-30-2001 05:13 PM
I'm pretty sure all V-8 cars used the same yoke (25 splines) The '65 six cylinder used a 28 spline oddball yoke. Now I'm pretty sure the driveshaft length is the same too. Guess I need a driveshaft from a later model 9" rear'ed car to cut to length, that has the same 25 splined yoke with larger u-joints. Thanks for your tip TomP, I'll have to go shopping at the wrecking yard. And thanks for evryones replys!  SteveW
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bob emmerich
Journeyman Posts: 65
From: Stratford,Connecticut
Registered: Sep 2000
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posted 05-31-2001 02:48 PM
You may be right about the yokes(6-8 cyl different)but when I converted my C-4 to a 3 speed(V-8's both)The C-4 yoke wouldn't go into the 3 speed. I dunno? maybe I had a fluke or mistake or different years or something-but that was my experience.
Oh, well, I guess you learn something new everyday-what I have found out is definately true of old Fords-NOTHING IS CAST IN STONE (IN REGARDS TO VIN #'s,PARTS INTERCHANGABILITY,OR COLORS/INTERIORS.)
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n2oMike
Gearhead Posts: 2395
From: Spencer, WV
Registered: Jan 2001
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posted 05-31-2001 03:32 PM
All V8 C4 automatic mustangs have 28 spline output shafts on the tranny. The very earliest toploader mustangs had a "defective" 25 spline output that was recalled. Some are still out there, but pretty much all the rest are the regular "small output" toploaders that have 28 spline outputs. The slipyoke on the driveshaft that engages the tranny is the same for C4 automatics and small output toploaders. I've picked up a toploader cheap a long time ago for $50. It had this 25 spline output. It wasn't really a problem, though, since I was rebuilding it and had a spare mainshaft. All small input toploaders are small output. Big input (1 3/8") toploaders are generally close ratio and came behind 427/428's for the most part. The 390 got the small input/output toploader. I had trouble bending the splines on slipyokes on my car. The cure was finally found with a Mark Williams unit. They are the only company that sells a severe duty 28 spline C4/toploader slipyoke. Only catch is is costs around $200, and uses a special U-joint.... so a new driveshaft needs to be made. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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