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Old 07-09-2013, 05:39 PM   #1
Vette-kid
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Default transmission Yoke

Any reason a trans slip yoke from an 81 th350 will not work with a 78 th350 car? Spline count and joint type look the same, I just want to make sure Im not missing anything.
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Old 07-09-2013, 07:03 PM   #2
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Should work fine. Just ensure that the width for the u-joint (1330) is the same.
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Old 07-10-2013, 12:10 AM   #3
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thanks. what is confusing me is that I am seeing 32 spline listed on most websites for a 78. mine is a 26 (with a gap where 27 would be). Did my trans come out of an 80-82 car? it is a lock up 350, so i suppose that would make sense (non lock up in 78..correct?)
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Old 07-10-2013, 11:48 AM   #4
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32 spline is for standard trans, 71-81. 77 was the last year for 32 spline automatic, 400 trans only. All 350 trans are 27 spline, 76-81. 82 vettes were 700r4 only.
Mike
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Old 07-10-2013, 01:45 PM   #5
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Quote:
Originally Posted by tracdogg2 View Post
32 spline is for standard trans, 71-81. 77 was the last year for 32 spline automatic, 400 trans only. All 350 trans are 27 spline, 76-81. 82 vettes were 700r4 only.
Mike
Thanks for the info, Ive been trying to find that exact details! Thanks!
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Old 07-10-2013, 04:36 PM   #6
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Your welcome.
Let me add this:
80-82 automatics use a 1310 series u-joints front and rear as Larrywalk mentioned. Your vette uses 1330 u-joints front and rear. An 81 350 slip yoke won't work in your vette without using using a 1310 to 1330 conversion u-joint.
Mike

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Old 07-10-2013, 05:11 PM   #7
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Quote:
Originally Posted by tracdogg2 View Post
Your welcome.
Let me add this:
80-82 automatics use a 1310 series u-joints front and rear as Larrywalk mentioned. Your vette uses 1330 u-joints front and rear. An 81 350 slip yoke won't work in your vette without using using a 1310 to 1330 conversion u-joint.
Mike
Well, Im not sure what this set-up came out of, but what I have now are the strap type u-joints (This is 1330, correct?), and NOT U-bolts. Also odd, my initial measurements have the driveshaft being just a hare of 28 inches if I get from the center of the hole, 29.5 if I measure all the way to the end. I would love to just measure everything up and see how much distance is between the trans and diff, but the engine/trans are still out of the car. Obviously I have a grab bag of parts from various places here (bought the car with a pile of parts, trans and drive shaft were in it at the time though). Just trying to make it work...doesnt have to be factory correct, just safe and functional.
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Old 07-10-2013, 05:51 PM   #8
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Only 63-70 1310 u-joints used the u-bolts and nuts. Starting in 71 they used straps and bolts on all the driveshafts. If the bolts for the straps use a 7/16 socket then they are 1330. The 1310 and the 1330 u-joints both use the same cap but the 1330 is 1/2 in. wider than the 1330. I can't help you with the driveshaft length. I'll be tearing down a 78 this weekend for a complete driveline overhaul and I can get you the length then.
Mike
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Old 07-10-2013, 07:51 PM   #9
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Quote:
Originally Posted by tracdogg2 View Post
Only 63-70 1310 u-joints used the u-bolts and nuts. Starting in 71 they used straps and bolts on all the driveshafts. If the bolts for the straps use a 7/16 socket then they are 1330. The 1310 and the 1330 u-joints both use the same cap but the 1330 is 1/2 in. wider than the 1330. I can't help you with the driveshaft length. I'll be tearing down a 78 this weekend for a complete driveline overhaul and I can get you the length then.
Mike
More good info! I'll check the bolt size in the morning.
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Old 07-11-2013, 10:34 PM   #10
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Well I havnt had time to do much with it, but the bolts are 7/16 heads. I have an 81 yoke on the way, Ill just have to get a conversion joint (looks fairly common). What bugs me is having to wait until I get the trans back in it to verify the driveshaft is correct.
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