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Another "Big Blue" - '86 F350 4x4 7.5L 460

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spike_time

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

To celebrate I took him to the gastation and filled him with premium!! It totaled my entire gasoline bill for the last 3 months.

On Mon, Feb 22, 2021 at 4:28 PM ArdWrknTrk [via Bullnose Enthusiasts Forum] <[hidden email]> wrote:

You know they say the power of a 460 will pass everything but a gas station!

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

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Tim
Big Blue: '86 F-350 XLT Lariat 7.5L 460 4x4
Dutch: 2012 Jeep JKU Sarah'con 3.5" Lift Upgraded Axles with E-Lockers

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

It's no joke, but 10 is an easy number to work with.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

10 was my "I'll get at least that" number. Early on with the new engine I didn't get that. Now, with ~1000 miles on the clock it has moved up to 11, and is starting to crowd 12 under ideal circumstances.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Any new engine will loosen up and start sealing better.
Both of which free up more power.
I'm sure you've done some tuning too.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Yep and yep. Timing and AFR on the latter. And idle vacuum is approaching 20", so I know she's sealing better and better.

To put it in perspective, at least MY perspective, Dad's 351M got 10 MPG or 10 MPG when I got it. But with a different engine, the 351M from Rusty, and a ZF5 to replace the C6, I got it up to 14 MPG at a steady 65 MPH. So if a "little" F150 gets 14 and if I can get 12 out of a rather heavy/loaded F250 then I'm doing pretty well.

Just setting expectations, Tim.

Gary, AKA "Gary fellow": Profile

spike_time

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

In reply to this post by spike_time

Hi there!!

One thing I'm wondering about, is replacing the bushings. Is it basically standard now to use Polyurethane bushings? Do people use them just for the simplicity of install?

Tim
Big Blue: '86 F-350 XLT Lariat 7.5L 460 4x4
Dutch: 2012 Jeep JKU Sarah'con 3.5" Lift Upgraded Axles with E-Lockers

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

I used poly bushings, but I don't think that makes it any easier to install.

From my reading, poly gives a firmer ride and a bit better control, but can squeak if not properly used. And it probably lasts longer than rubber. Rubber gives a better ride and won't make noise. But that is just my limited understanding.

Gary, AKA "Gary fellow": Profile

spike_time

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

In reply to this post by spike_time

I finally acquired a replacement tailgate trim piece and I'm taking the red reflector off of the acquire one to put on mine. Mine chrome is in much better shape than the other one.

In pulling the trim off the tailgate, I noticed what I thought where ceramic washers, but I realized they where rubber, just 35 years old.

Is is supposed to have rubber grommets attaching the Trim piece to the tail gate?

Tim
Big Blue: '86 F-350 XLT Lariat 7.5L 460 4x4
Dutch: 2012 Jeep JKU Sarah'con 3.5" Lift Upgraded Axles with E-Lockers

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Maybe petrified double side foam tape to keep it from rattling???

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

spike_time

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Well a new problem to tackle.

Found a puddle of oil by the driver side rear tire, after I parked it and can see that the rear outer seal is leaking <sigh>. I think this came about because I changed out the diff oil recently and with fresh clean oil, easier to leak ... ok, what should I know about replacing it? I'm going to do the bearings and do both sides. This is a 10.25" Ford Limited Slip.

Tim
Big Blue: '86 F-350 XLT Lariat 7.5L 460 4x4
Dutch: 2012 Jeep JKU Sarah'con 3.5" Lift Upgraded Axles with E-Lockers

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

You absolutely need to go with the updated Scotseal. (Type... whatever brand)
These glue to the axle housing and turn within themselves.

This was an issue with 10.25's
There is a TSB.

If i had the cover off I would consider putting a drain bung in the bottom, to make service easier, but you don't need to pull the cover to replace the seals.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

We don't have the instructions from the factory shop manual on the site for the 10.25" axle. I'll see if I can get that done today.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Is the TSB available?

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Jim - I'm glad you asked the question. Not because I have that TSB as I don't know if I do and don't know how to find the # of it? Maybe you do?

The reason I'm glad is that I was ready to say "Done! We have the FSM section on the 10.25" Sterling." But when You asked I looked at the TSB list I have and found one on the Sterling. It isn't the one you are talking about, but it starts out "A new 10.25" Ford axle will replace the HD Dana rear axles as a 1985 running change. The semi float axle service procedure is included in the Light Truck Shop Manual — Section 15-09, the full float information is contained in the TSB."

So I added the TSB.

Documentation/Driveline/Axles & Differentials and then tabs Rear Axles & Differentials, then Sterling 10.25".

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

This post was updated on .

Gary, the one I'm talking about is 94-19-24
There is something about a custom narrower bearing and a slinger that fits behind, but I haven't seen a need to go down that road.
The revised seal alone works for me.

On the 10.25, there is another TSB 91-6-7
About bearing preload. Which basically says torque to 55-65 ftlb while turning the wheel.
Then back off 5 clicks for new bearings or 8 clicks for used bearings (where you are just replacing the seal)
I know the seal is SKF 34384 or National 370047A

HTH!

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

That helped a lot, Jim. I have those TSBs and put them on tabs next to the FSM sections. See what you think now.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

'Driveline' is a clickable link, and as soon as I mouse over it it disappears.
Though I can instantaneously see the axles and differentials tab.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

Try it now, but refresh first.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

It's working now for me.

Thank you Gary!

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

ArdWrknTrk

Re: Another "Big Blue" - '86 F350 4x4 7.5L 460

Administrator

In reply to this post by spike_time

Also note that you should check that the vent hose connected to the brake hose splitter block must be clear.
Otherwise heat from operation will cause enough pressure to drive gear lube past the seals. (and brake shoes for these things aren't cheap

)

So I'm going to suggest you pull it off the hollow bolt that holds the splitter to the axle and blow air through it.
The upper end should be clipped to the top frame flange, out of the way of road debris and possible flooding (unless you're fording a deep stream)

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

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