460 is running rich on Edelbrock 1411

[ArdWrknTrk]

I hope you enjoy the dinner and show!

It will probably be cool to put faces & personalities with their usernames....

[viven44]

Thanks!!

I still haven't decided which one to drive. My top priority is comfort and neither one is a clear winner .... As crazy as I have been, neither vehicle has a spare tire yet!! AAA coverage has given me overconfidence.

For BB 2WD, its easy I just need to grab the best wheel/tire off the parts truck...
For Bronco, I will need to see what I have at my storage shed in terms of tires, I know I have a couple of brand new 31" tires... find an aluminum rim and mount the tire....

I need to pick one and get ready... I am favoring BB 2WD, but will need to leave early 5am or so and get to the truck show... that will help me beat the heat.

[viven44]

Made it there today. I am disbelief as well, just like others at Dinner but I actually got 12.5mpg on BB 2WD driving 70-75mph today. The first fill up I got 11.5mpg and I was stuck in some heavy construction traffic leaving Dallas for about 30 mins.

In the city with pure stop and go, I have never done better than 8…

Looks to be a feature of the 3.07 Dana 70HD rear end that BB 2WD came with

[Gary Lewis]

Yep, you had Colin, Scott, and I in disbelief.  But I'm glad it works.

[ArdWrknTrk]

Friday traffic on the 1-95 corridor it took me 2:07 to go 39.6 miles. (I filled up and left)
Rowing between 2nd, 3rd and stopped.
I'll be lucky to get 8 at that pace with 4.10's.  

But there was an oily package when I arrived!  😉
I expect to be busy this weekend.
Hope y'all have a fine show!

[Gary Lewis]

Wish you could be here, Jim.

Oily package?

[85lebaront2]

I have gotten 12.5 in Darth running mostly 70-75 on I-70 after some lesser MD state highways going from Exmore VA to Falling Waters WV. Darth has a 3.55 limited slip and weighs 6400 lbs empty and has 6 215/85R-16 tires on the road.

[viven44]

That’s really good Bill!

BB 2WD’s tare weight is only about 4800 lbs
I may have had some 100 lbs of supplies and parts.

I just got back home. Total trip 585 miles per odometer including back and forth to comfort inn at Owasso and a short trip I took with Scott. Used about 47.5 gallons. So averaged about 12.3mpg.

[85lebaront2]

Before I went MAF/SEFI and E4OD, he got a solid 10, city, highway unless I was pulling the 5th wheel, then he got 8.

[Gary Lewis]

You did really well, Vivek!  It has to be that 3.07 axle ratio.  And, but the way, here's a snippet from the 1984 Light Truck Data Book showing that axle as standard with a 460 2WD SRW.

[viven44]

Thanks Gary!

That explains that it was clearly a common option ... purpose... maybe have the 1 ton to have the payload capacity to haul a cab-over camper (?) or payload long distance. The towing capacity is only about 7000 lbs but the truck tows really well. The previous owner towed his restoration car project on UHAUL trailer from Washington and while in Texas a massive trailer with chemical tanks many times (he hauled chemicals)... I had half a mind to bring the Bronco on a trailer... but UHAUL transportation calculator said it was out of this trucks league ... it would allow a small car but not a Bronco... it didn't even ask what rear end ratio I had, but somehow knew I couldn't

[Gary Lewis]

Can't believe U-Haul knows what the axle ratio is, so can't understand their position.  But it should handle a Bronco well if you have brakes on the trailer.

As we discussed yesterday, the 3.07 axle ratio will cause more slippage in the torque converter than 4.10's would.  But to clarify, it takes X amount of torque to push the truck down the highway.  The rear axle gears multiply the torque so 4.10 gears require about 1/3 less torque through the transmission, which means less slippage in the TC.

So the 3.07 gears are going cause more slippage and, therefore, generate more heat.  As Jim says, the C6 excels at turning energy into heat.  But if you have a large enough transmission cooler you can get by towing with those gears.

[ArdWrknTrk]

I'm surprised at the D70, and that there's no option for 3.73:1

I would definitely like that as a ratio in my truck but I'm not about to change TWO axles to get there..

[viven44]

The 3.07 w/460 is no slouch either from a full-stop (largely due to my transmission probably). kramttocs can attest to that probably when we went on our joyride in the afternoon.

The C6 I have shifts normally from 1-2 at about 25 mph and then 2-3 at about 40mph. If I press the throttle hard, 1-2 shifts happen at about 40mph and 2-3 is closer to 55-60mph...

Gary had mentioned this shifting characteristic may also be a feature of the 3.07 rear end... I didn't drive my 84 F150 much before I sold it but I don't know if it did the same. I have a strong feeling the transmission on BB 2WD has been rebuilt with a shift kit that is geared towards towing...  the downshifts are also rather aggressive. I am down in the 1st gear anytime I slow down below 20mph and initially it was a bit annoying and I contemplated tuning the shifts to lower... but I probably won't.

For pure city driving, I would any day go for a 3.55 or 4.11... Big Red was super fun in the city with the 4.11/T19... the 3.07... gunning is essential to pass

[viven44]

That makes sense Gary. That is why if/when I buy a new F250 or F350 with the 445 CI gas (aka 7.3L Godzilla) I would go with the 4.3 gear option. (Probably not until I'm ready to use it for its intended purpose) The 10-speed transmission is there so it should not hurt too much on the highway.

The dealers don't understand why I need a 4.3. They tell me ... look both options (3.73 and 4.3) can tow more than 15,000 lbs and when are you ever going to tow over 15,000 lbs and everytime I tell them. Yes they both can but whatever it is that I am towing..... the 4.3 can do it easier (resulting in reduced effort and longevity of drivetrain)... I don't want to buy a diesel and I'm going to go with the best gas configuration

Well now, I will take your salient points as well with me on the torque converter slippage vs rear end ratio. They will think I'm very knowledgeable... sorry I will borrow this one and probably won't remember to credit you  


Here is a pic of BB 2WD from a few years ago