bronco 4-speed ?
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Joined: Apr 2004
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Ford offered an OD 4 speed in the late '70s. Not sure they offered a granny gear 4 speed. The OD is geared like a bad 3 speed 1-2-3, and 4th is over. Big gap 2nd to 3rd. Shifter reads 1-2-3-OD.
That the one?
That the one?
Super Moderator
Joined: Apr 2004
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Not sure on the number sold, but they are not "rare". They were part of efforts to boost mpg numbers. One Bronco ad video posted here a while back showed the OD 4 speed as they talked about their MPG figures.
These transmissions were installed in many cars, including Mustangs, and truck versions in F/e150s and the Bronco. Several versions, iron or aluminum cases, top shifted, turret shifted or, side shifted, and car or truck versions.
All the while 5 speed ODs were available everywhere else in the world, but Ford, GM and Chrysler were going cheap regearing old performance 4 speeds with OD. Another page from the darkest chapters of the American auto industry. (although these were far from the worst idea....
)
These transmissions were installed in many cars, including Mustangs, and truck versions in F/e150s and the Bronco. Several versions, iron or aluminum cases, top shifted, turret shifted or, side shifted, and car or truck versions.
All the while 5 speed ODs were available everywhere else in the world, but Ford, GM and Chrysler were going cheap regearing old performance 4 speeds with OD. Another page from the darkest chapters of the American auto industry. (although these were far from the worst idea....
)
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Um, the NP 435 was available in the F-series/Bronco from about 69-79 and it was geared with a very low 1st then moved to your typical 3-speed ratios.
NP435 gear ratios:
1st - 6.68:1
2nd - 3.34:1
3rd - 1.79:1
4th - 1:1
NP435 gear ratios:
1st - 6.68:1
2nd - 3.34:1
3rd - 1.79:1
4th - 1:1
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
Yep, it's either the NP-435 or a T18/T19.
Both are tough as nails and geared very similarly. More than likely the stock unit.
I don't believe the overdrive trans came in Broncos until 81 with the SROD.
Both are tough as nails and geared very similarly. More than likely the stock unit.
I don't believe the overdrive trans came in Broncos until 81 with the SROD.
Thread Starter
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Senior User
Joined: Oct 2008
Posts: 121
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From: uniontown,pa.
the doors were locked when i first looked at it ,could'nt see the pattern but the trans. you listed are ok with me just never saw one in a bronco. what gear ratios did ford offer in these vehicles? another thing (kinda ot) it has 33'' goodyears on what looks like jackman wagon wheels (spokes are welded) do they still produce this type of wheel.
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Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Not too many transmissions in the '78/'79 Broncos.
Also, after doing some research, I don't believe the NP-435 was offered in the Bronco until 1980.
So it was either the C6 Auto:
1st 2.46
2nd 1.46
3rd 1.00
Or the T18/T19
1st: 6.32
2nd: 3.03
3rd: 1.79
4th: 1.00
I think that was about it.
Maybe post up a pic of the wheels you're talking about.
Also, after doing some research, I don't believe the NP-435 was offered in the Bronco until 1980.
So it was either the C6 Auto:
1st 2.46
2nd 1.46
3rd 1.00
Or the T18/T19
1st: 6.32
2nd: 3.03
3rd: 1.79
4th: 1.00
I think that was about it.
Maybe post up a pic of the wheels you're talking about.
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Lead Driver
Joined: Sep 2002
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From: Gateway to the West
After a bit of more intense research the general consensus seem to be that the 435 saw OEM applications in the entire Ford truck line from as early as 1966 through as late as 1992. It has a PTO on the passenger side of the case.
The T18 used from 1966-1978 had a different shift pattern and reverse gear location than later T18s (79+). The T18 uses spur-cut first and reverse gears with no synchronization while the T19 (though identical in physical appearance0 is fully synchronized in all gears with first and reverse helical gears like 2-4th.
The T18 also has a PTO on the passenger side of the case. Early models have "T18-1E" stamped into the driver's side of the case while later units bore the stamp "13-01".
The T18 used from 1966-1978 had a different shift pattern and reverse gear location than later T18s (79+). The T18 uses spur-cut first and reverse gears with no synchronization while the T19 (though identical in physical appearance0 is fully synchronized in all gears with first and reverse helical gears like 2-4th.
The T18 also has a PTO on the passenger side of the case. Early models have "T18-1E" stamped into the driver's side of the case while later units bore the stamp "13-01".
Moderator
Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
I was meaning Broncos as far as the NP-435 goes. They were used in trucks all the way back to the 60s, but Broncos started in 80 or so.
Rear end ratios were, I believe, a 3.00 (optional highway), 3.55 (standard), and 4.11 (optional off-road).
However, there are a LOT more aftermarket options, any anything could have happened in 30 years.
Rear end ratios were, I believe, a 3.00 (optional highway), 3.55 (standard), and 4.11 (optional off-road).
However, there are a LOT more aftermarket options, any anything could have happened in 30 years.
Junior User
Joined: Aug 2011
Posts: 81
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From: LaRue
I had an 84 Bronco 303 4 speed manual with 1st granny Manual T case and hubs. Pulled a camper with it for several years. Now have a 96 with 351 E4OD ESOF converted to manual hubs when the auto's stopped working.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
303 is a 60's vintage manual only used in cars. Helluva swap for a full-size truck.
