The Ford Barn

pistonbroke · 03-06-2023, 11:24 AM

So my brother and I headed off to the dump in my worn out old 41 half ton. Long about the third stop light on a busy four lane we noticed the old four speed was shifting hard and no matter how well I timed it or double clutched it. At the next light no matter which gear I put it in it was locked up but in neutral it appeared to be in high gear so fanning the clutch and 4.11 gears got us home and in the shop. The next morning after looking at Mac Vanpelts diagram we pulled the top off to have a look. All looked good as far as 80 plus year old spur gear transmissions go. It took us a bit to realize the the main shaft and the input shaft had somehow fused together but that is what had happened. Now the ? is why ? The oil level is good and no burnt smell but it does have a froth to it even after sitting over night, strange . Any thoughts as to why or what caused this. I'm not to worried as I have a nice 39 three speed going in with the new 255 next month but I'm curios . Tim

pistonbroke · 03-06-2023, 11:32 AM

One last thing, after looking at macs web sight I realized I have a 32 thru 37 four speed. tim

cadillac512 · 03-06-2023, 11:51 AM

Odd. Sounds like something made the roller bearing quit rolling and caused it to friction weld. Problem is that sometimes the cause is hidden or destroyed by the damage. No matter how much I think I know, there's always another lesson...

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Terry

pistonbroke · 03-06-2023, 04:08 PM

That was my theory as well although I have rebuilt or dismantled many a transmission where the rollers have self destructed but not welded the two shafts together. I think what ever happened happened fast. Tim

Tinker · 03-07-2023, 12:48 AM

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Lot to unpack. a 4 speed that fused, i guess. A new 3 speed going in.

Trucks usually had a stump puller 4 and 4:11. If you are putting in a 3 speed and maybe later a 3:78 or 3:54 rear it would probably get you to old timey cruise.

Know what condition your condition your is in...

03-06-2023, 11:24 AM	#1
pistonbroke Senior Member Join Date: Feb 2021 Location: Perry Mo. Posts: 485	What can happen when you think you've seen it all So my brother and I headed off to the dump in my worn out old 41 half ton. Long about the third stop light on a busy four lane we noticed the old four speed was shifting hard and no matter how well I timed it or double clutched it. At the next light no matter which gear I put it in it was locked up but in neutral it appeared to be in high gear so fanning the clutch and 4.11 gears got us home and in the shop. The next morning after looking at Mac Vanpelts diagram we pulled the top off to have a look. All looked good as far as 80 plus year old spur gear transmissions go. It took us a bit to realize the the main shaft and the input shaft had somehow fused together but that is what had happened. Now the ? is why ? The oil level is good and no burnt smell but it does have a froth to it even after sitting over night, strange . Any thoughts as to why or what caused this. I'm not to worried as I have a nice 39 three speed going in with the new 255 next month but I'm curios . Tim

03-06-2023, 11:32 AM	#2
pistonbroke Senior Member Join Date: Feb 2021 Location: Perry Mo. Posts: 485	Re: What can happen when you think you've seen it all One last thing, after looking at macs web sight I realized I have a 32 thru 37 four speed. tim

03-06-2023, 11:51 AM	#3
cadillac512 Senior Member Join Date: Apr 2019 Location: Kansas Posts: 921	Re: What can happen when you think you've seen it all Odd. Sounds like something made the roller bearing quit rolling and caused it to friction weld. Problem is that sometimes the cause is hidden or destroyed by the damage. No matter how much I think I know, there's always another lesson.... Terry __________________ "It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up" 302

03-06-2023, 04:08 PM	#4
pistonbroke Senior Member Join Date: Feb 2021 Location: Perry Mo. Posts: 485	Re: What can happen when you think you've seen it all That was my theory as well although I have rebuilt or dismantled many a transmission where the rollers have self destructed but not welded the two shafts together. I think what ever happened happened fast. Tim

03-07-2023, 12:48 AM	#5
Tinker Senior Member Join Date: May 2010 Location: MN Posts: 7,053	Re: What can happen when you think you've seen it all Sponsored Links (Register now to hide all advertisements) Lot to unpack. a 4 speed that fused, i guess. A new 3 speed going in. Trucks usually had a stump puller 4 and 4:11. If you are putting in a 3 speed and maybe later a 3:78 or 3:54 rear it would probably get you to old timey cruise. Know what condition your condition your is in...