Bullnose Enthusiasts Forum

Revised Speedometer Page - Help Needed

Classic

List

Threaded

7 messages Options

Gary Lewis

Revised Speedometer Page - Help Needed

Administrator

Recently someone asked what speedo driven gear he needed in order to correct his speedo's readout. I checked my page on speedometer gears (Driveline/Speedometer Gears) and realized I didn't have anything to easily answer that question.

But, I also realized that I had three pages - Speedometer Gears, Driven Gears, and Drive Gears. And it wasn't easy to get from one to the other.

Given that, I've revised things significantly. Everything is on one page, just in tabs so it is easy to go from one to the other. And, there are now three calculators using embedded spreadsheets.

But I need your input as to how and whether the spreadsheets work for you. PLEASE!

If they don't make sense, if the directions aren't helpful enough, if there's a mistake, etc then I need to know.

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

85lebaront2

Re: Revised Speedometer Page - Help Needed

Administrator

Very good, if I still had a gear driven speedometer. You might want to clarify one item, the $ in the charts, which I believe means the gear is integral with the shaft. Nice calculator program!

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

Gary Lewis

Re: Revised Speedometer Page - Help Needed

Administrator

Thanks, Bill. I did add:

Also, see the note below that says that a "$" in the Drive Gear column means that the gear is actually part of the transmission's output shaft and is, therefore, not replaceable. That was standard on the automatic transmissions.

Anyone else? Are the calculators understandable?

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: Revised Speedometer Page - Help Needed

Administrator

Didn't try them, mine is electronic so adjustments are done by changing the count multiplier.

Bill AKA "LOBO" Profile

grumpin

Re: Revised Speedometer Page - Help Needed

Everything seems understandable to me.

My rear axle code is 39, which is listed as 3.55. Would I use 3.54 in the rear axle ratio?

I've seen this elsewhere if I remember correctly, meaning 3.54 instead of 3.55.

Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona

Gary Lewis

Re: Revised Speedometer Page - Help Needed

Administrator

Thanks.

On the axle, there's not enough difference between 3.54 and 3.55 to worry about as it won't change the needed driven gear at all. But if I remember correctly 3.54 is the ratio for a larger diff, like a Dana, and 3.55 is the ratio used on an 8.8 or 10.25 Sterling.

The ratio has to do with the number of teeth you can get on the ring gear. An 8.8" doesn't have quite as much room as a 9", and since you have to have an integral number of teeth, it limits the ratios you can have.

Gary, AKA "Gary fellow": Profile

grumpin

Re: Revised Speedometer Page - Help Needed

Thanks Gary!

Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona