1971 Torino Draive Shaft
Printed From: The Ford Torino Page
Category: Model Specific Forum
Forum Name: 1970-1971 Ford and Mercury
Forum Description: Technical discussion for 1970-1971 Ford and Mercury
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=12477
Printed Date: 26-March-2026 at 6:34PM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: 1971 Torino Draive Shaft
Posted By: oleycoach
Subject: 1971 Torino Draive Shaft
Date Posted: 01-September-2014 at 2:48AM
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Almost done with my 1971 Ford Torino started by someone else. Drive shaft was off but in the car. Tried to install it after putting new u-joints on and cleaning it up. Got it installed but doesn't seem quite right at the transmission. From the slide yoke to the tail of the tranny has about 1-3/4" of the "clean" shaft sticking out. Is that normal? Or should it be further into the tranny? I believe the total "clean" shinny portion of the slip yoke is around 5" long. Pretty sure it's a C4. How do I verify that and could there be an issue with the number of splines in that slip yoke? I don't have it running yet but when we push it, it seems to "jump" a bit there. Lee
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Replies:
Posted By: FoMoCoOne
Date Posted: 09-September-2014 at 9:16AM
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Is the tail shaft boot on the trans, it's about 1-3/4"? I have a 302/351C C4 drive shaft out of a car and will get some measurements and a spline count on the slip yoke.
------------- 1968 Ford F-100 LWB (300 I6, 4 Speed, Ford 9 3.50 LS) 1968 Ford F-350 Dually LWB (390, 4 Speed, Dana 3.73, Factory FDB) 1969 Ford Talladega (Presidential Blue 428CJ/C6) 1996 Ford Mustang (Daughter's) |
Posted By: 75GranMan
Date Posted: 09-September-2014 at 2:18PM
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You may may a trans seal with no dust boot vs a seal with no boot? ------------- John 75Gran Torino 4spd  |
Posted By: Rockatansky
Date Posted: 09-September-2014 at 2:19PM
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pretty sure the C4 yoke is 28 splines? there's a couple other trans's that use the same spline count, but the OD of the barrel is different on the newest trans that uses it, by just a smudge enough to not be right so check the barrel OD with a caliper or micrometer if you have one, but a caliper will do I've always heard that rule of thumb is 1" of slip in the yoke, I like mine a little less in a street car, the rear suspension doesn't travel all that much & geometry should be close to neutral so the driveshaft length isn't gonna change all that much through the full articulation of the pinion travel http://www.driveshaftspecialist.com/TransYoke/Ford%20Trans%20yokes.html" rel="nofollow - http://www.driveshaftspecialist.com/TransYoke/Ford%20Trans%20yokes.html shows some dimensions you can look at, the 4R70W uses a 1.6" diameter barrel vs 1.5" for most others with the differential end disconnected, slide the yoke all the way into the trans & make a small mark with a paint pen, Sharpie or crayon on the yoke. then put the back end of the D-shaft back together & measure the 'slip' ------------- 72 GT Ute |