Tranny Swap
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Laughing Gas
Joined: Sep 2007
Posts: 869
Likes: 5
From: Near Shenandoah Valley
Tranny Swap
I want to change the 4 speed out of my '83 F-350 2 wheel 6.9 with the 5 speed out of the '93 -7.3 parts truck. Anyone see a problem with this. Any suggestions?
Lead Driver
Joined: Mar 2006
Posts: 5,104
Likes: 1,517
From: western SD
You will have to change out the clutch and pressure plate as they are different. Either use the duel mass from the 7.3 or do as I did and get a single mass conversion for the 7.3 and put it on the 6.9. You could use the origanal flywheel for the 6.9, if you can find the clutch plate that has the correct hub to fit the input shaft on the ZF5. Cheaperjeeper posted the part nos. for the clutch plate that he used when he did this conversion 2 -3 years ago, but I couldn't get them to cross over to NAPA nos. so I just went with the 7.3 single mass conversion.
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Laughing Gas
Joined: Sep 2007
Posts: 869
Likes: 5
From: Near Shenandoah Valley
Thanks for the info "farmert". I have a dual mass and used clutch, but had an new in the box clutch/p plate for a 6.9. Hoped to use existing parts. I can by new clutch. Thanks again, now I will be looking for a cheap turbo set up.
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Laughing Gas
Joined: Sep 2007
Posts: 869
Likes: 5
From: Near Shenandoah Valley
I did mention 2 wheel on the '83 but not on the '93. They are both 2 wheel. I really don't think much on some issues like drive line since I make drive shafts as needed anyway. I'm a retired machinist ( except on my repairs which seem to be numerous) and custom made the current one on the '83.
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Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Being a retired machinist may give you the knowledge/skill ... Do you have a big enough lathe to do it!
To do a drive line properly takes a pretty long lathe with supports or a big enough one to pass it through the head.
How about balancing equipment ...
All I'm saying is, if you can use factory (or professional) made drive lines you will be much better off then DIY cut drive lines.
-Enjoy
fh : )_~
To do a drive line properly takes a pretty long lathe with supports or a big enough one to pass it through the head.
How about balancing equipment ...
All I'm saying is, if you can use factory (or professional) made drive lines you will be much better off then DIY cut drive lines.
-Enjoy
fh : )_~
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Laughing Gas
Joined: Sep 2007
Posts: 869
Likes: 5
From: Near Shenandoah Valley
I appreciate your concern, but at first I was a bit flustered. Been there done all that. I reminded myself that there are those that say they are something and are not. I have found that if shafts are turned true and welded properly, they will have no vibration in trucks running 85 mph. (I'm not sure that I will run the 'ole 6.9 faster than that.) There is always the first time and it can be balanced locally. Again, thanks for the word of caution.
New User
Joined: Jun 2010
Posts: 9
Likes: 0
From: Sycamore, IL
i did it, i had to. we were in mich. camping with some friends and i twisted my drive shaft like a pretzel and ripped it in half. had to make a new one to get home. took a longer one and cut it down, made a jig, used a sharpie to indicate it, and welded it up. it's still in my truck today 
. by the way, my camper is a 35 foot, 11,000 lb fifth wheel.
. by the way, my camper is a 35 foot, 11,000 lb fifth wheel.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Never did I say it couldn't be done ... I have done many, both ways, with and without a lathe.
With or without a lathe some work out, some don't, even for professional shops!
-Enjoy
fh : )_~
With or without a lathe some work out, some don't, even for professional shops!
-Enjoy
fh : )_~
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