manual trans thread
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Lead Driver
Joined: Mar 2008
Posts: 7,192
Likes: 384
From: Near Los Angeles
The 300 needs a manual transmission. My Bronco 300 with a manual will leave behind my brother's Bronco 351 with a C6.
I've often thought about what it would be like to have a GV on the back of a manual trans. Unfortunately, the Bronco's are just too short for one (rear driveshaft is around 33" extended) so I can only dream.
I've often thought about what it would be like to have a GV on the back of a manual trans. Unfortunately, the Bronco's are just too short for one (rear driveshaft is around 33" extended) so I can only dream.
Moderator
Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
Lol, true. 
Just lullin' along, getting great gas mileage at 100.
That's with my current transmission though. If I was able to do a gear vendors, it'd allow me to have an easy swap of a T18/19 (no hydraulic clutch conversion) to get rid of my light duty aluminum transmission with a cast iron one. I'd still have an overdrive with it due to the GV, something those early cast iron transmissions don't. I'm always worried about my current one breaking while off-roading, but do too much highway driving to sacrifice OD.
Certainly don't need a GV with my current trans.
Just lullin' along, getting great gas mileage at 100. That's with my current transmission though. If I was able to do a gear vendors, it'd allow me to have an easy swap of a T18/19 (no hydraulic clutch conversion) to get rid of my light duty aluminum transmission with a cast iron one. I'd still have an overdrive with it due to the GV, something those early cast iron transmissions don't. I'm always worried about my current one breaking while off-roading, but do too much highway driving to sacrifice OD.
Certainly don't need a GV with my current trans.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
F-250, (and anyone else for that matter), if you'd like, I made a computer program that allows me to look at how transmission ratios, final drives, tire size, etc. affect engine RPMs and speed. It's pretty useful when seeing what a tranmission, gear swap, or tire size change would do to your engine.
PM me if you're interested.
PM me if you're interested.
Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
Post Fiend
Joined: Jan 2007
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From: Almost Heaven
A manual tranny makes a big diference. I've been experimenting with my automatic transmission by manually shifting it (up and even down, when needed). The truck drives so much stronger.
I imagne a manual transmission behind the 300 would make a world of difference.
I imagne a manual transmission behind the 300 would make a world of difference.
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
I am hesitant though, because the ZF 5, which sounds like the best trans so far, has three gears that I would be using--without granny first and OD. That is just like my C6. But I need to compare the gears.
What really makes me sit up and take notice is the thought of installing my Gear Vendor with the ZF, giving me double the amount of forward gears, and double OD. Whow, an automatic-manual hybrid trans.
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
What really started to make me wonder about my c6 was when Harte3 mentioned that he has no problem getting up to 70 mph going up the on ramp.
I am hesitant though, because the ZF 5, which sounds like the best trans so far, has three gears that I would be using--without granny first and OD. That is just like my C6. But I need to compare the gears.
What really makes me sit up and take notice is the thought of installing my Gear Vendor with the ZF, giving me double the amount of forward gears, and double OD. Whow, an automatic-manual hybrid trans.
I am hesitant though, because the ZF 5, which sounds like the best trans so far, has three gears that I would be using--without granny first and OD. That is just like my C6. But I need to compare the gears.
What really makes me sit up and take notice is the thought of installing my Gear Vendor with the ZF, giving me double the amount of forward gears, and double OD. Whow, an automatic-manual hybrid trans.
Post Fiend
Joined: Jan 2007
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From: Almost Heaven
Justin (AbandondedBronco) makes a valid point, Mr. Kevin. You release a lot of ponies with the manual transmission as opposed to the automatic. Not only do you retain 20 or more horse, you also command the transmission - which as I've been learning makes more than a large impact on power.
New User
Joined: Jul 2009
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Not to hijack or anything but I have a T-19 I am going to rebuild and put behind a 300 in my 64. I have been wondering about the clutch.
F250Restorer - are you planning to try and recreate the factory clutch set up for the manual shift or go with a cable? Or even a hydraulic?
F250Restorer - are you planning to try and recreate the factory clutch set up for the manual shift or go with a cable? Or even a hydraulic?
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
It depends on the engine's power band to some extent, I guess. When my Bronco had it's original 302/E4OD and I also owned a '90 F150 with 302/M5R2 (both had 3.55 gears), the Bronco was quicker and got better gas mileage. So the 302 didn't mind the auto. But my current 300 did not like it's original E4OD at all.
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
It depends on the engine's power band to some extent, I guess. When my Bronco had it's original 302/E4OD and I also owned a '90 F150 with 302/M5R2 (both had 3.55 gears), the Bronco was quicker and got better gas mileage. So the 302 didn't mind the auto. But my current 300 did not like it's original E4OD at all.
Horsepower = (Torque * RPM) / 5252
Horsepower = (255 * 1400) / 5252
HP = 67.97
So at 1400 RPMs when it's making it's most torque, the engine's only making 68 horsepower! An EFI 300 (260tq @ 2000 RPM) is still only making 99. If during that peak strength an auto is sapping upwards of 40 horsepower, that doesn't leave much horsepower left to get the vehicle moving... On a carb model, that could be like 25 - 40hp left going to the wheels.
A 302 (at least EFI), makes 270tq @ 2400 RPMs. 123 horsepower left during it's peak torque. A little bit extra for that auto transmission to pull from, so maybe it doesn't care nearly as much.
The 300 just doesn't have enough hp at it's peak torque left over to be giving it up to an automatic.