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Post by jeephawk on Jan 29, 2013 15:26:57 GMT -5
Ran into a little snag on the 289/c-4 swap. Im getting close to dropping in the engine /tranny and was looking at the driveshafts that I have.
I have both the original and the driveshaft that came from the car that I got the 289/c-4 from. I heard that I needed the yoke from the donor car since its different from the mercomatic. Is this correct?
If so Im running into the problem that the u joints are a different size.
Looks like they are about a 1/16 off. Being the Mercomatic ujoint looks to be 1" and the donor car(64 Comet I believe) is 1 1/16.
Anyone run into this problem and what did you do to solve it?
Thanks
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Post by w2zero on Jan 30, 2013 2:31:46 GMT -5
count the splines, the old Mercomatic is probably 26 spline. You need to check the newer transmission and be sure to check to see if the trans output shaft is a match or more likely a 28 spline. Use a matching slip yoke.
Re: the u-joint difference. Just determine what two sizes you need, width and diameter, and buy the joint at the parts store that matches. Yes, they make one that will adapt. I have checked in the past and the cross casting in the middle is the same but the cups can be different diameters and thickness at the ends. I have just mixed and matched cups to make the change. Just use matching ones on opposite sides of the cross.
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Post by jeephawk on Jan 30, 2013 10:48:03 GMT -5
ok. Yeah Ive got the slip yoke that came with the c-4 and its 28 spline. It just has 1" cups on it. The driveshaft off the merc has 1 1/16 size cups. Ill try the parts store and see if they can come up with something. So far all I have seen is 1 1/16 to 1 1/8 cups conversion u joint.
64 must have been a one year only deal or ?
I guess if it comes down to it I can buy a new slip yoke?
Weird that a u joint would have 2 different cup sizes on one ujoint. Seems like it would have been easier just to make one common size and be done with it.
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Post by w2zero on Jan 30, 2013 14:54:01 GMT -5
My 64 has an 89 aod in it and the original drive shaft with a later C5 slip yoke. Plus there is a 9" rear that is a newer vintage at the other end of the shaft. U-joints are the same on it but the cups only match in opposite pairs. It was originally 6 cyl with the same trans and rear as yours.
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Post by arie on Jan 30, 2013 18:05:37 GMT -5
When I converted to a C 4 Carquest found me a u joint with basic # 3250 it was 1 1/16 by 1 inch cups. Cannot remember the prefix letters
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