Choosing a transmission help
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Junior User
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Choosing a transmission help
I'm burning clutch every time I move this thing. I think its geared way to high for the 3- speed tranny.
2wd 1983 f-100.
Engine-300 I6 4.9
Transmission-SROD 3 speed with OD
Rear end-8.8 w/2.47 gears
Wheels-16"
Tires-32"
Is there a tranny I could just swap in? I'm hoping I DO NOT have to install a hydraulic clutch.
Found this on craigslist. But, I dont think it will work without hydraulic clutch.
1991 Ford F-150 5-speed trans
2wd 1983 f-100.
Engine-300 I6 4.9
Transmission-SROD 3 speed with OD
Rear end-8.8 w/2.47 gears
Wheels-16"
Tires-32"
Is there a tranny I could just swap in? I'm hoping I DO NOT have to install a hydraulic clutch.
Found this on craigslist. But, I dont think it will work without hydraulic clutch.
1991 Ford F-150 5-speed trans
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Junior User
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Posting Guru
Joined: Jun 2004
Posts: 1,092
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From: Casa Grande
I think they both are hydraulic clutch, but good trans in my opinion, and if I'm correct they have lower 1st gears than the 3od. Was thinking about swapping one into my 85 with the same setup you have. But mine is already hydraulic and someone swapped in 3.55 rear gears.
Posting Guru
Joined: Jun 2004
Posts: 1,092
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From: Casa Grande
I've been told it's a direct swap as long as you go with the early one that had a speedo drive gear, even suppose to be about the same length. Later models used an electric speedo that ran off a tone ring. But you will have to change to a hydraulic clutch setup.
Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
Both the 5 speed transmissions (Mazda & ZF) are hydraulic clutch.
The earlier 4 speeds (both granny & overdrive) can be set up with either mechanical or hydraulic clutches.
I'm converting from a C6 to a manual soon & will go with mechanical linkages to avoid the cracking firewall problems of the hydraulic clutch trucks.
Any of the 4 speed granny transmissions (T18, T19 or NP435) will bolt up to your bellhousing - you might have to turn your rear cross-member, or use some of the other holes already in it - but top gear is only 1:1 (no overdrive) on all of these.
Also, you may need to alter/swap your driveshaft
There are some differences in gear ratios - some T19, & all Ford-version T18 & NP435's have a granny low (6.3:1 & 6.69:1 ) - these trannys also have a big jump between 3rd & 4th.
But some T19's have a higher-speed low gear (4:1) with 2nd/3rd/4th more evenly spaced.
Low gear is synchromesh on the T19, but not on the T18 or NP435.
All three are heavy & durable.
Be careful to get the Ford version of these transmissions - other brands used them too, with some differences - e.g. bolt patterns, input shaft lengths/splines etc.
The earlier 4 speeds (both granny & overdrive) can be set up with either mechanical or hydraulic clutches.
I'm converting from a C6 to a manual soon & will go with mechanical linkages to avoid the cracking firewall problems of the hydraulic clutch trucks.
Any of the 4 speed granny transmissions (T18, T19 or NP435) will bolt up to your bellhousing - you might have to turn your rear cross-member, or use some of the other holes already in it - but top gear is only 1:1 (no overdrive) on all of these.
Also, you may need to alter/swap your driveshaft
There are some differences in gear ratios - some T19, & all Ford-version T18 & NP435's have a granny low (6.3:1 & 6.69:1 ) - these trannys also have a big jump between 3rd & 4th.
But some T19's have a higher-speed low gear (4:1) with 2nd/3rd/4th more evenly spaced.
Low gear is synchromesh on the T19, but not on the T18 or NP435.
All three are heavy & durable.
Be careful to get the Ford version of these transmissions - other brands used them too, with some differences - e.g. bolt patterns, input shaft lengths/splines etc.
Super Moderator
Joined: Apr 2004
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The low-first 4 speeds would be a bit better than your current set up.
The Mazda's 3.91 first would barely be better than your current 3.25, but gear spacing is much better.
Serving suggestion: Go nuts with a 3.50 or 3.70 or even 4.10 9 inch axle from a truck of your same vintage, AND the Mazda box. Sure, you'll need to fiddle with the juice clutch, but it will be like a different truck.
Start with the 9".
I had your set up with 3.50 and 31s, and it was pretty doggy, thus my suggestion for the shorter gears.
The Mazda's 3.91 first would barely be better than your current 3.25, but gear spacing is much better.
Serving suggestion: Go nuts with a 3.50 or 3.70 or even 4.10 9 inch axle from a truck of your same vintage, AND the Mazda box. Sure, you'll need to fiddle with the juice clutch, but it will be like a different truck.
Start with the 9".
I had your set up with 3.50 and 31s, and it was pretty doggy, thus my suggestion for the shorter gears.
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