The Ford Barn

Detonator · 02-10-2011, 12:20 PM

We've put in 3.54 gears and want to switch to an 18 tooth speedometer gear and housing. 18 tooth Model A housing/gears are available (Bratton's P/N 23170). Will these bolt on the later torque tube?

Thanks

Bruce Lancaster · 02-10-2011, 12:42 PM

Yes, but...
Two different sizes at the actual cable: '28-9-early '30 with oval speedo uses one cable, '30-31-V8 another.

Floyd · 02-10-2011, 04:17 PM

As Bruce says, get the gear for the late model A. Also get the press in bushing, looks like a hat with a hole, the long version. The extra $1.15 is well worth it as you will demolish the old one getting it out. Also the 18 tooth will only work in a turtle that had 3:78 (19 tooht). The 4:11 , 21 tooth turtle is too tall and the 18 tooth gear will not reach down far enough to pick up on the gear on the driveshaft.
Floyd

Detonator · 02-16-2011, 01:47 AM

It seemed like the 19 tooth turtle was too tall for the 18 tooth gear, too. It wouldn't engage the ring on the drive shaft. When you talk about getting the late model, do you mean the one that has the square drive?

Bruce Lancaster · 02-16-2011, 02:07 PM

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Late Model means late 1930--31 Model A, same square drive as V-8's...unless of course you are using the '28-9 oval face speedometer in your car, which needs the early plus an early speedo cable.
Try to find a complete turtle...full gear mesh is good. Doesn't Bratton's have them as repro assemblies?

02-10-2011, 12:20 PM	#1
Detonator Senior Member Join Date: May 2010 Location: Santa Cruz Posts: 391	Will Model A speedo drive work on V8 torque tube? We've put in 3.54 gears and want to switch to an 18 tooth speedometer gear and housing. 18 tooth Model A housing/gears are available (Bratton's P/N 23170). Will these bolt on the later torque tube? Thanks

02-10-2011, 12:42 PM	#2
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Will Model A speedo drive work on V8 torque tube? Yes, but... Two different sizes at the actual cable: '28-9-early '30 with oval speedo uses one cable, '30-31-V8 another.

02-10-2011, 04:17 PM	#3
Floyd Senior Member Join Date: May 2010 Posts: 472	Re: Will Model A speedo drive work on V8 torque tube? As Bruce says, get the gear for the late model A. Also get the press in bushing, looks like a hat with a hole, the long version. The extra $1.15 is well worth it as you will demolish the old one getting it out. Also the 18 tooth will only work in a turtle that had 3:78 (19 tooht). The 4:11 , 21 tooth turtle is too tall and the 18 tooth gear will not reach down far enough to pick up on the gear on the driveshaft. Floyd

02-16-2011, 01:47 AM	#4
Detonator Senior Member Join Date: May 2010 Location: Santa Cruz Posts: 391	Re: Will Model A speedo drive work on V8 torque tube? It seemed like the 19 tooth turtle was too tall for the 18 tooth gear, too. It wouldn't engage the ring on the drive shaft. When you talk about getting the late model, do you mean the one that has the square drive?

02-16-2011, 02:07 PM	#5
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Will Model A speedo drive work on V8 torque tube? Sponsored Links (Register now to hide all advertisements) Late Model means late 1930--31 Model A, same square drive as V-8's...unless of course you are using the '28-9 oval face speedometer in your car, which needs the early plus an early speedo cable. Try to find a complete turtle...full gear mesh is good. Doesn't Bratton's have them as repro assemblies?