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Tractor Talk Discussion Forum

O/T Changing auto trans. to std. trans.

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37 chief

06-03-2007 08:04:53




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I have a 80 Ford F 350 I use for hauling my tractor I use for mowing. It currently a auto trans. I have been thinking for some time to change it to a 4 speed. I have the peddle assy. trans, and bell housing. Any one out there ever done this? Will the drive shaft be the same? Thanks for any info. Stan




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CWL

06-04-2007 05:06:28




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
I'm a little late chiming in, but I did an automatic to manual swap in a 79 F150 4X4 short bed with a 400 V8. Got the tranny and transfer case from a truck of the same year and design. When I put it in all of the holes were in the frame. The driveshafts worked. There was already a plate in the floor board hump that only needed to be cut out for the 4-speed shifter to go through. If I remember right there was even an outlined depression were it needed to be cut. It was a very easy swap an I have been very pleased with it.

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buickanddeere

06-03-2007 21:19:29




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
How about a later model automatic with an non computer valvebody. Equiped with a lockup torque and overdrive? I'm no Ford expert but they must have made one? Best of both auto & standard transmissions.



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Bob

06-03-2007 21:36:26




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 Re: O/T Changing auto trans. to std. trans. in reply to buickanddeere, 06-03-2007 21:19:29  
Buick,

Dorf's attempt at what you describe was the AOD, and it ain't gonna "cut it" in a heavy pickup.



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buickanddeere

06-04-2007 20:09:25




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 Re: O/T Changing auto trans. to std. trans. in reply to Bob, 06-03-2007 21:36:26  
For about the same money as some rip off trans shops building a "stock" transmission. This company builds several models of upgraded Ford auto/overdrive/lockup transmissions. Link



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john in la

06-03-2007 20:34:14




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
The main differance and the one that is often over looked is the rear end gear ratio is differant.

A automatic can pull off the line with much higher road gears but the standard needs a lower gear ratio to prevent clutch chatter and a early demise.

I would want to knoe the rear end ratio before commenting on the swap.



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Mojo Mahalia

06-03-2007 09:44:01




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
The enngine control computer will be different, perhaps along with actual emmission control components and wiring.



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jimtNV

06-03-2007 10:07:27




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 Re: O/T Changing auto trans. to std. trans. in reply to Mojo Mahalia, 06-03-2007 09:44:01  
hey 'mojo' you're wayyyy out of whack.

Computers weren't even on anything until around 1988.



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Billy NY

06-03-2007 09:42:41




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
Stan, I did this in a 1980 K-10 back in '94, I'm not sure of the differences, but in principal it cannot be all that different.

If you can source parts from a similar or same model, most likely you will have everything you need, except what might be specific to Ford.

Flywheel, bell housing, cross member, rear drive shaft ( is yours 4x4 if so add transfer case and front drive shaft ) pedal assembly, clutch linkage and some misc. parts. New heavy duty clutch assembly, make sure the flywheel is turned.

I took out my steering column, punched a hole into the floor where the linkage rod needed to pass through, mounted my clutch & brake pedal for a manual, and wedged the spring with shims until it expanded enough to hook in place, that was one stout spring. I change out the auto, after mounting my bellhousing and clutch, ( darned if I recall how I assembled this now, it was the first standard and clutch I ever worked on actually ) I still have the plastic input shaft alignment tool, raised the transmission into place, secured cross member, it was different between auto and stick. Standard with the transfer case seemed heavier too. Connected my driveshafts and it was done. I cranked er over and with some adjustment on the threaded rod, it worked great. I got everything from another donor truck, 78 K-10, that only had 30,000 miles on it, rotted out before it wore out, the fluids were still clean, I changed them out to 80-140 cling that we had in the shop at the time. The differential gears were 270's in this truck so it was geared high, speedometer was off after this and I never wired up the reverse lights. I drove it 176 miles from where I had to do this job, to where it is currently, which I used for pushing snow. It also had a fresh 350 with 4 bolt main, with 152 compression, found that in a junkyard, just put in a truck that was junked, this drive train will out last the truck. I used to take it into the field, line up 4-6" trees with the plow frame, and knock em over, drive right over them, just can't go backward, gear drive transfer case, that is where I think the granny gear is still low enough, on a 2WD it might be significantly higher as you don't have 4WD low. It was an intersting challenge but can be done. The steering column I got from the donor, did not fit the electrical plug, so I left the one in it with the auto lever on it.

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Johnski

06-03-2007 09:18:01




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
I have never gone from auto to std trans but I have done several std to auto swaps in Fords. The driveshaft will probably be different. You may need the floor hump from a std for clearance and shifter location. There is also wiring to consider.The park/neutral and backup light switches are on your auto trans. You should consider using a clutch safety switch also unless you are the only one driving the truck. HTH regards,Jf

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old

06-03-2007 08:36:42




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
On some trucks its not all that bad to change them on others its a night mare BTDT a few times. You have to change flywheels, also need all the clutch pedel linkage and if the holes are not alraedy drilled for the parts you need to drill them. Also a truck with a auto tranny has higher gears in the rear end then in one that came with a 4 spped whcih can be good for gas mileage but can cause problems if 1st isn't low enough in the tranny, but most 4 speeds for a truck 1st is a granny gear so it works out well. My 1980 chev has an auto in it at one time and it works well for hauling tractor and I also get around 18MPG

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Greg_Ky

06-03-2007 08:09:50




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 Re: O/T Changing auto trans. to std. trans. in reply to 37 chief, 06-03-2007 08:04:53  
Driveshaft will be different and don't forget to install a pilot bearing in the crankshaft and more than likely the transmission mount will also be different.



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Harold Hubbard

06-03-2007 17:45:12




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 Re: O/T Changing auto trans. to std. trans. in reply to Greg_Ky, 06-03-2007 08:09:50  
One thing to check, some engines that originally came with an auto did not have the crankshaft drilled for a pilot bearing. The ones I know about were Dodges, but it could happen with any brand.



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