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EFV-8 Club Forum / General Ford Discussion / Removing Banjo differential to replace speedo gear

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Discussion Topic: Removing Banjo differential to replace speedo gear

Howie1935

05-19-2025 @ 10:56 AM

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Those dimensions are very tight and a great piece of info. I'll be spending time getting everything planned and parts and steps organized.
Thanks.

TomO

05-14-2025 @ 5:57 PM

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You may have the wrong springs installed. The bottom plate comes in different thicknesses to accommodate different number of leaves in the spring.

The spring leaf width is different between the front and back. The space inside the U is 2.64" for the front and 2.88" for the rear.

Tom

51woodie

05-14-2025 @ 9:38 AM

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The bolts begin swapped by a PO makes sense to some degree, but you would think that the incorrect lengths would have been noticed. I didn’t try remove the bolts when I pulled my diff, I just tipped them up to clear the spring. If do decide to swap the bolts, I would suggest you do them one at a time.

Howie1935

05-13-2025 @ 5:37 AM

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I really appreciate your information. I'm mechanical but worked on large machines and not old cars. I'm working up the courage to jump into this.

I did notice something on this car (purchased off a distant friend, it was his dad's project that he had local garages do the work). The two U-bolts at rear are too long and the cotter pins are beyond the castle nuts. And by chance the two U-bolts at front are too short and the cotter pins can't get to the hole in the bolts. It appears that the local garage put them in the opposite end of correct. By chance you have a procedure to remove the front U-bolts so I can swap them and be able to secure with the cotter pins?

Howie1935

05-12-2025 @ 9:03 AM

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Yes removing the worn out output speedo gear on output shaft of trans. Turtle and gear already replaced. 1935 sedan, 1939 juice brakes installed.

51woodie

05-09-2025 @ 10:40 AM

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Howie,
I forgot to mention that the shock links (depending on you car type) will need to be disconnected. Loosen the link nut until it is flush with the end of the threads, then use the tool to free the link stud. I think these tools are available at Harbor Freight.

This message was edited by 51woodie on 5-9-25 @ 10:43 AM

51woodie

05-09-2025 @ 7:30 AM

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Howie,
I used a 1/8x2x2x44" length of steel tubing, with the ends mitered at 45deg. and placed the pointy end in the spring eyes (see pic) then jacked the rear of the car up. I placed a floor jack under the diff and disconnected the two U-bolts that secure the spring, then lowered the axle. You will need to disconnect the speedo cable from the "turtle", the brake flex line and e-brake cable, then remove the four bolts that hold the "clamsh*ll to the trans. I had to remove the floor panel over the trans to access the clamsh*ll area. It is best to have some blocking or such positioned where the "wishbones" attach to the driveshaft to support it when the d/s comes way from the trans.
One thing I did was to check the torque on the bolts that connect the u-joint housing the the back of the trans, and found two were tight and the others were "snug". you can only get at them when the d/s is out of the way. Also the "nut" that connects the speedo cable tot he "turtle" is a very fine thread and easy to cross thread, as a previous owner did to mine. I found it a challenge to get the d/s inserted into the splines on the u-joint when reassembling. Long needle nose pliers did the trick.
Reconnect all the parts and pieces, then bleed the brakes.

This message was edited by 51woodie on 5-9-25 @ 7:31 AM

40 Coupe

05-09-2025 @ 5:38 AM

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Are you removing the rear to replace speedo gear? What year vehicle? hydraulic or mechanical brakes?
19 tooth speedo turtle B-17270-A

pauls39coupe

05-08-2025 @ 6:55 PM

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Try just unbolting the spring from the U bolt on the rear cross member. The axle should come down and out as a unit. Check the top of the center section for numbers indicating the axle ratio.

Howie1935

05-07-2025 @ 6:05 AM

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Doing this is a first for me. I've listed the basic steps and would like some responses on steps missed or out of sequence, please.

I already replaced the 19-tooth turtle speedo gear but it worked only about did 1 mile before speedo stopped again. I can see the output drive gear is worn almost flat.

1. Spread rear leaf spring and disconnect from axle.
2. Loosen or even disconnect parking brake so axle can be moved backwards. Keep eye on flexible hydraulic line at front end of radius rods. Disconnect hose if necessary
3. Disconnect Radius rods at end of torque tube so axle can move towards back of car.
4. Remove bolts at rear of trans and support torque tube before pulling back.
5. Once torque tube clear, allow to rest on floor.
6. Now with access to rear of trans, remove parts to get the speedo drive gear and replace.

Reverse for reassembly.

Questions:
1. I don't see the ratio stamped on the rib at differential nor is it stamped on the turtle. The turtle does have "19". Can someone give me the correct part number for the correct speedo drive gear? My parts book is by ratio which I don't have. My best guess is 3.78, but not sure.
2. Any special tools or tricks to help make this job any easier?

Thanks for any help.

Howie

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