From what I read, the C6 auto sucks up 40, the C4 auto is around 10 - 12hp. If that's the case, I imagine a manual is much less, so probably pretty negligible.

 

Dadgum.

I wonder how much my E4OD takes?

Maybe I don't want to know. lol

 

The C6 does rob a lot of power, but most of the times it is consuming the most power, you can't get it to the ground anyways. The most power is robbed when the converter is starting to engage, like untracking a heavy load, or backing it up.
The converter may cause a power loss, but it also mutliplies the torque of the engine. It's the torque multiplication that takes power. At those times, you need the torque anyways, not power.

 

I wonder if the 302's C4 (I have mated to D30 transfer in my barn) would bolt up to the 300 I6 without changes to the bolt pattern?

 

Just like it was made for it........ Because it was. Same bolt pattern.

 

Only thing that would need to be swapped, is the flexplate(flywheel). 302 is extrenally balanced, and 300 is internally balanced.
C4 consumes less power, but isn't as stout as the C6.

 

Thanks OBC

RW,
consumes less power, but isn't as stout as the C6
Roger that, plus a little lighter n shorter.

OK, good info for me.

 

Right off the bat, based on all the I6's here, there must be MANY running. The aftermarket people need to offer an easy afordable throtle body replacement for the older carbed I6's. I know I look into it a while back and they had a nice swap out for the GM's with a twin nozzle TB and easy hook up, tho pricey! I would by one if they offered it for the Ford I6's.

That alone would pick up the MPG's , performance and eliminate a lot of problems the YF carbs cause...What do ya think?

 

Lighter yes, shorter, not usually. The C4 is physically the same size as the C6, and they can be swapped without needing to redo the driveshaft in a 2wd car/truck.
A C4 will not handle nearly as much power or torque, nor pull the load a C6 will do with ease.

 

I can believe it, Allison transmissions in heavy diesel applications can really suck down the power.

 

Typical drivetrain loss is around 17-22%. The C6 is a bit higher, under certain conditions, just like the allison's. The hydraulic pump inside the trans takes power to turn it, and when the trans is asked to do a heavy job, it needs more pressure to get the job done, which takes more power from the engine. Lighter loads require less internal pressures, thereby requiring less power to turn the pump.
The harder you are working it, the more power it takes. This has a direct affect on it being able to do the job.

Power steering pumps are the same way, but to a much lessor degree. At low speed, the pump works harder to make it easy to turn the wheels. At higher speeds, less effort is needed to turn the wheels, so the pump doesn't need as much drive power. PS pumps are more prone to growling when you turn lock-to-lock sitting still, than doing the same while rolling, even at a very slow speed.

 

Alfonzy
If not welcomed previously to the forum allow me to do so. Lotsa great knowledgable folk here (saved me $ and headaches- I'm unemployed and not a mechanic). Hope you can offer as much as U recieve (& goin large on both!). So welcome aboard, ejoy your stay!

The aftermarket people need to offer an easy afordable throtle body replacement for the older carbed I6's

Is that like the megasqurit, howle and others (need some spelling help!)?

 

Wow, it really looks like I hit the Jackpot. I got my Bronco from my Father in Law and he was the original owner and said he had to actually special order it when he got his. He wanted a work horse vehicle that would get him where he wanted to go and wanted economy also. He couldn't find a 6cyl anywhere in the area when he was shopping for one. He also didn't want alot of bells and whistles. The only option he got was A/C. It's a Custom, vinyl interior, not even a headliner in it. He needed something he could drive out to the phosphate mines and take fishing on the weekends.

My only ting is that no matter how easy I drive it, there seems to be some lag in it and I can only manage to muster about 13-14mpg. I feel like I should be doing better. I know the vehicle was taken care of and never abused. He's OCD(no B.S.) and took meticulous care of it. It probably never went more than 100 miles beyond 3000 between oil changes. The only deterioration that's present on it is the stuff that Ford just never got right, like the vacuum lines that dry out and crack. And, I think I may be developing the B-Pillar Cracks. Other than that I just have a strong exhaust smell when driving it and I'm working on figuring it out.

Ive been on FSB for about the past year trying to learn as much as I can about my new hobby and only really recently started looking here. I think I may have found a new home.

 

You should be seeing 16 - 18 mpg highway with that 3.08 gear ratio and factory tires.

I wonder if you have a catalytic converter going bad. It would explin the loss of power and fuel economy.

 

I've allways heard that the E40D has some bearings in the same places where C-6s have thrust washers for less power loss over the C-6s.