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Speedometer issue

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84FS460

Speedometer issue

My 84 f250s speedometer quit working. I removed the speedo cable and hooked a drill up and the speedo works and the gear looks fine.I unhooked the cable at the speedo and drove, the cable spun while I went in reverse but tried to spin when I went forward. Bad drive gear and is it easy to replace in a BW1345 transfer case?

ArdWrknTrk

Re: Speedometer issue

Administrator

You will need to pull the rear prop shaft yoke or flange depending on how your truck is equipped.
That nut is pretty torqued on there, and I can't really recommend using an impact gun.

In a 1345 I do believe you only need to remove the seal to get the drive gear off.
It's not like the -56 where there is a collar/clip and a retaining ball that needs to come out.

Gary mentioned the other day that his newly rebuilt 1345 is leaking through the splines, so you probably want to use some sealant there.

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.

Whisler

Re: Speedometer issue

In reply to this post by 84FS460

If the output yoke nut is loose this can cause the same problem. If it is tight then the problem is inside.

God Bless
Whisler

Frankenstein: 1989 F250 4X4, C-6, Hurst Pro-Matic 2 shifter, carbed '84 351W, Edelbrock manifold, Edlbrock AVS, DS2 ignition, 3G alternator, JBA shorty headers, no cats, dual exhaust with H pipe.

84FS460

Re: Speedometer issue

In reply to this post by 84FS460

Thanks guys for the info. I pointed my camera into the hole and saw the drive gear is bad. So the fun removing the yoke begins. I am also surprised the driven gear isn't damaged.

Gary Lewis

Re: Speedometer issue

Administrator

Yep, that looks bad. Worn out in the center.

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: Speedometer issue

Administrator

This post was updated on .

No worse than the yellow one in my transfer case. 😲

If you use sealant on the splines, put it in the yoke so there's no chance of any getting into the pickup or fluid pump.

Pre-lube the new seal, so it doesn't start dry.

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.

84FS460

Re: Speedometer issue

In reply to this post by 84FS460

Anyone know of a source to find a new drive gear?

1986F150Six

Re: Speedometer issue

Administrator

Is the green one mounted on a metal sleeve?

ArdWrknTrk

Re: Speedometer issue

Administrator

This post was updated on .

1345's have them on a sleeve.

#8 in the diagram below

Borg-Warner pn. 1345-110-002

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.

1986F150Six

Re: Speedometer issue

Administrator

6, 7 or 8 teeth?

ArdWrknTrk

Re: Speedometer issue

Administrator

It looks blue to me.

E0TZ-17285-C BLUE 7 Tooth

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.

1986F150Six

Re: Speedometer issue

Administrator

In reply to this post by 84FS460

84FS460 wrote

My 84 f250s speedometer quit working. I removed the speedo cable and hooked a drill up and the speedo works and the gear looks fine.I unhooked the cable at the speedo and drove, the cable spun while I went in reverse but tried to spin when I went forward. Bad drive gear and is it easy to replace in a BW1345 transfer case?

https://www.bing.com/videos/search?q=BW+transfer+case+1345+6+teeth+speedometer+gear&docid=608032962567405723&mid=1B7849FDDC4DF7FD2FD61B7849FDDC4DF7FD2FD6&view=detail&FORM=VIRE

ArdWrknTrk

Re: Speedometer issue

Administrator

In reply to this post by ArdWrknTrk

https://cobratransmission.com/bw-1345-speedometer-gear-55000065-1

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.

1986F150Six

Re: Speedometer issue

Administrator

In reply to this post by 1986F150Six

I did not find a NOS one [E0TZ-17285-C], but there is an aftermarket one:

https://www.ebay.com/itm/BW1345-FORD-SPEEDOMETER-DRIVE-GEAR-7-TEETH-WITH-STEEL-SLEEVE-1-375-ID-2-OD-/164157786811

ArdWrknTrk

Re: Speedometer issue

Administrator

This post was updated on .

David, I'm getting that yellow is 8-tooth.

It also has a different Ford E1TZ-17285A and Borg Warner 1345-110-006 number...

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.

1986F150Six

Re: Speedometer issue

Administrator

Jim,

This is what I read: This a New 7 tooth E0TZ-17285-C Ford Speedometer Drive gear. This fits BW1345 Transfer cases with the Steel sleeve 1.375 ID and 2" OD Speedometer Drive Gear. This on has the 2" OD and 1.375 ID steel sleeve. Do not be concerned with the color of the gear.

ArdWrknTrk

Re: Speedometer issue

Administrator

If it says "do not be concerned", I guess you shouldn't!

But I've never seen gears (on either side) that weren't properly colour coded.
That's why they're coloured after all.

Maybe these people can't be bothered changing pellets when they change the mold?

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.

84FS460

Re: Speedometer issue

In reply to this post by 84FS460

I fixed the problem and the speedo works again and it's pretty accurate.The

drive gear is a different color but works fine and goes on ok.

Gary Lewis

Re: Speedometer issue

Administrator

Well done! But it looks like you now have a 7-toothed drive gear instead of the 8-toothed gear that was on there originally. I would think that would make your speedo read low by 13%. If that's true then you may want to reduce the driven gear tooth count by two.

Gary, AKA "Gary fellow": Profile

84FS460

Re: Speedometer issue

I used a speedometer app on my phone and one of those street signs near school zones that tell you how fast your going to see what the real speed is and its off by one mph. I'm content with that.