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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Starting in 1940 the splines became finer in passenger cars and trucks on the drive shaft.
Patrick's 3.55 gear set for trucks will not work in anything earlier than 1940 as that was the first year for hypoid rear ends in trucks. You would need a 1940 or later 1/2 ton torque tube, axle housing and axles for his 3.55 set, then there is the spline issue, but that can be overcome.
If using a 50-54 pass 3.5 you would need to use the hole assembly including cross axle housing. The length of the torque tube may need to be changed. There is still the spline issue but that can be overcome if you go that way. You may also want to install 1940-48 axles to stay 6 lug.
To get past the spline issue you have a few choices. You can change to 1940-46 gears in your 37 trans(if a 3 speed), use a conversion U' joint(I have some, and they show up on eBay), or change the female end cap on the rear of the drive shaft to fine spline.
Lots to think about.
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