Drive Shaft
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Drive Shaft
Hi All,
I have been working on my 1952 F2. I just changed the rear end from 3/4 to to a 9" with 3.50 gears. It has the 2 piece drive shaft with the carrier bearing. When I hooked up the drive shaft it slid back about 1 1/2" farther then it did with the original rear end. I haven't had it out on the road as we have snow and bad weather. Has anyone done this and did it work OK. I didn't know if I could get by with that or if I need to have the drive shaft made longer. Any input would be a big help. Thanks, Dennis
P.S. I also have a real good 3/4 ton rear end with 4.86 gears if someone needs one. Would sell very reasonable.
I have been working on my 1952 F2. I just changed the rear end from 3/4 to to a 9" with 3.50 gears. It has the 2 piece drive shaft with the carrier bearing. When I hooked up the drive shaft it slid back about 1 1/2" farther then it did with the original rear end. I haven't had it out on the road as we have snow and bad weather. Has anyone done this and did it work OK. I didn't know if I could get by with that or if I need to have the drive shaft made longer. Any input would be a big help. Thanks, Dennis
P.S. I also have a real good 3/4 ton rear end with 4.86 gears if someone needs one. Would sell very reasonable.
Lead Driver
Joined: Oct 1999
Posts: 6,777
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From: Kalispell, MT
Where is your sliding splined yoke? Driveshaft I think. I picked up a longer splined yoke at a local driveline shop when I did this swap in my F1 with the HD 3 spd. I think you have a similar setup. I went in with my old one, explained how much longer it needed to be and the guy pulled a new one off the shelf.
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Thanks for the info. I'm not real sure if I need to change of if it would be ok the way it is. The slip yoke is just before the carrier bearing. This is all new to me so I just need to figure out if I'm ok or not Thanks for your time and help, Dennis
Hotshot
Joined: Oct 2009
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From: Burbank, WA
It doesn't make sense that the slip joint is before the bearing. The drawing in the parts manual shows it as being after, where it can take up the slack from the movement of the rear axle. You might want to take a closer look.
If the slip joint is as tight as it was prior to you moving it out, you may be fine. If it has more vertical movement, or seems sloppy, then you have pulled the splines out too far and need to lengthen the shaft. It just depends on how much spline support you have in the joint. There's no way to know without looking at it, or driving the truck. An inch and a half does seem a little far, to me, but only you can tell how much is still left connected.
If the slip joint is as tight as it was prior to you moving it out, you may be fine. If it has more vertical movement, or seems sloppy, then you have pulled the splines out too far and need to lengthen the shaft. It just depends on how much spline support you have in the joint. There's no way to know without looking at it, or driving the truck. An inch and a half does seem a little far, to me, but only you can tell how much is still left connected.
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Before I hooked this up, I slid the slip joint out as far as I could and it had a stopping point. I could only slide it out about 1 3/4" in so it has some kind of a stop. It looks the longest it could be in 3 1/2 so I am saying it's in there about 2 inches. At the moment there is no play there or it don't seem sloppy but I don't know if it's pulled out as far and it can and is resting at the stopping point. When I was talking about the drive shift I was starting from the back and the slip joint is what hooks up to the back side of the carrier bearing. I guess I'll just have to try it and see what happens. I just don't want to cause problems in the future. Thanks for your help and have a good one, Dennis P.S. I see you truck says Mercury. I've never seen one. If you would send me some pictures to dbrown2@marktwain.net I would love to see it. Thanks
Senior User
Joined: Jul 2007
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From: SE / NWL MI
I don't know how much driveline movement a F2 gets at the rear axle. For grins I might jack the truck up in back via the frame and let the springs and axle fully extend and see what's left in shaft spline contact. I don't imagine your going to be leaping short piles of dirt going air born with your truck. If you get some holes in the pavement like we do around here though I'd hate to experience a hard bounce and drop a shaft. Just a thought.
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That's kind of what scares me. I did have the truck up when I changed the rear end and the slip joint was about 1 1/4" back farther then it was with the 3/4 ton rear end. The jack stands were on the frame at that point and when I set it down it measured about 1 1/2". So setting it down pulled it another 1/4". This truck will be pampered once I get it like I want but I might be hauling wood in it in the fall. Thanks for your thoughts and help. Have a good one, Dennis
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