So as you know I have this 640 Ford and feel it's just too fast for quality mowing jobs or anywhere I want full pto rpm but don't want to travel so fast. Can the 650 or 660 transmissions be bolt in if I wanted? Any other transmissions suitable for swapping? If I came across a good transmission and had it on hand when the time came I needed to split the tractor for something, I could swap it in then.
- Thread starter martyh
- Start date
Ultradog MN
Well-known Member
- Location
- Twin Cities
Any transmission from 55 to 64 will fit.
However, you MUST use the block plate that came
with the transmission. The block plate on the
00s were 1/8" thick and the 01s and 000s are
1/4". Wrong plate will cause much hair pulling
when it comes to adjusting the clutch.
If you need slow, sell your 640 and buy a 3
cylinder 2000 or 3000 with 8 speed
transmission. On those, 1st gear at pto speed
is about 1.6 mph or as said, get an SOS.
However, you MUST use the block plate that came
with the transmission. The block plate on the
00s were 1/8" thick and the 01s and 000s are
1/4". Wrong plate will cause much hair pulling
when it comes to adjusting the clutch.
If you need slow, sell your 640 and buy a 3
cylinder 2000 or 3000 with 8 speed
transmission. On those, 1st gear at pto speed
is about 1.6 mph or as said, get an SOS.
a 5 speed swap gets you one lower gear, which like said about is roughly half the speed of the 4 speed first. We cut first cut in first gear on our 860, mainly so we can watch for debris and because a lot of our cutting is trails thru woods not big fields.
However, I wouldn't even waste my time with a trans swap. First, you shouldn't be cutting at 2200 rpm anyway, I think PTO speed is like 1600-1700 rpms on the 4 speeds? If whatever you are cutting is too tall or thick that you cant get a good cut at pto speed in first, then you either need to take half swipes, or cut it sooner.
I do have to say I love the SOS for brush cutting though. lets me mow the few open spots in a higher gear and then just click down when I get to a tight turn. cant remember what gear I mowed it, but think my speed fell between 2 gears on the 5 speed.
However, I wouldn't even waste my time with a trans swap. First, you shouldn't be cutting at 2200 rpm anyway, I think PTO speed is like 1600-1700 rpms on the 4 speeds? If whatever you are cutting is too tall or thick that you cant get a good cut at pto speed in first, then you either need to take half swipes, or cut it sooner.
I do have to say I love the SOS for brush cutting though. lets me mow the few open spots in a higher gear and then just click down when I get to a tight turn. cant remember what gear I mowed it, but think my speed fell between 2 gears on the 5 speed.
Yes, a 5 speed from a similar vintage Ford tractor will bolt in.
Be certain to get all needed conversion parts, e.g., engine flywheel, clutch, etc.
To avoid surprises, look for a transmission from a **0 rather than an **1.
First gear in a 5 speed is considerably lower than first gear in a 4 speed and will slow your tractor noticably.
Dean
Be certain to get all needed conversion parts, e.g., engine flywheel, clutch, etc.
To avoid surprises, look for a transmission from a **0 rather than an **1.
First gear in a 5 speed is considerably lower than first gear in a 4 speed and will slow your tractor noticably.
Dean
NoNewParts
Member
big work, and buying parts alone at a yard.. usually big money.
(I buy entire tractors to get big parts when I need them...cheaper)
Your solution is in your other posts.
Buy the 861 you want.
keep your 640 for other jobs.
It's a very handy size tractor.
and if you truly need real slow....I agree...get a Blue one with the dual range 8-speed.
low-low is so slow at low rpms, I could get off the tractor while it's pulling in, move stuff out of the way in the garage, get back on and park it
(just joking of course, but you know what I mean)
(I buy entire tractors to get big parts when I need them...cheaper)
Your solution is in your other posts.
Buy the 861 you want.
keep your 640 for other jobs.
It's a very handy size tractor.
and if you truly need real slow....I agree...get a Blue one with the dual range 8-speed.
low-low is so slow at low rpms, I could get off the tractor while it's pulling in, move stuff out of the way in the garage, get back on and park it
(just joking of course, but you know what I mean) That pretty much says it all right there. In fairness, the 640 was stupid fast at first because I didn't have a functioning proofmeter and by guessing, it turns out I was over rpm'd by quite a bit. Probaby 1900-2000rpm. I think it will be fine at 1500rpm. I only got a taste of that though because I threw a fan blade right after I got the proofmeter installed (ironically at 1500rpm) which took out the water pump. Yesterdays Tractors parts department is not exactly swift when it comes to shipping time. The transmission swap is more a question to gain knowledge, I don't think I'd really do it to this particular tractor, maybe some future tractor project. My 640 is too nice to start turning it into a FrankenTractor. There is no doubt an 800 series with a 5 speed or more is in my future. My wife and I are committed to the older Ford tractors.
Many auto parts stores can get you most of the parts you ever need for your tractor and do so over night. I get most of the parts I need form my local O'Reilly's auto parts store. I do so for 2 reasons. #1 only good auto parts store in town #2 only 7 mile form the house so cost very little to go there
If my water pump and fan ever show up I'll get to see what 3.7mph first gear at 1500rpm looks like. I think I am going to be fine. I found the specs for the 600 and 800 series 5 speed transmissions and their 2nd gear is the same as the 4 speed's 1st gear. Their first gear is listed as 2.3mph which might actually be too slow. Anyway, now that I know where I can get all of the gear speeds for most tractors, I can make a more informed decision on any future tractor purchases.
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