1950 ford custom/1990 ranger rear end install.

[Terry Wilkerson]

I'm installing a1990 ranger rear end in my 50 ford custom. I have removed the shock mounts and spring perches on the ranger rear end. Ordered new perches to weld on.
I'm thinking of making a jig pattern off the stock rear end to locate the weld on perches. Is there an easier or better way to locate the new perches?

[ActionYobbo]

You need to focus more on your pinion angle.
Mark your axle at the distance the inside of the perch should sit then assemble the whole shebang and set your pinion angle then tack weld them perches to the axle. Take it all back out and weld up the perches a bit at a time allowing cooling between welds and apply paint

[Terry Wilkerson]

Ok so I checked pinion angle found trans 4 deg down, rear end 1 deg down. I think this is known as broke back pinion angle designed into the 50. Seems like a good time to fix this. I think I'll shoot for 2 to 3 deg up on the rear end.

[tubman]

Before you tack weld the perches, check the wheelbase on both sides; they should be the same. Also measure side to side to make sure it's in the middle.

[ford38v8]

I'm confused. I was under the impression that the correct geometry dictated that angles should be equal, offsetting each other. Why would you settle for 2º to 3º for the pinion when the transmission is 4º ?

[Terry Wilkerson]

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If they should be the same then I'll shoot for 4deg.

[ActionYobbo]

Originally Posted by ford38v8

I'm confused. I was under the impression that the correct geometry dictated that angles should be equal, offsetting each other. Why would you settle for 2º to 3º for the pinion when the transmission is 4º ?

There is much more to working out pinion angle. You need to allow for wrap which depending on your HP and suspension setup will change the pinion a few degrees under full load or cause axle bounce

[ford38v8]

Originally Posted by ActionYobbo

There is much more to working out pinion angle. You need to allow for wrap which depending on your HP and suspension setup will change the pinion a few degrees under full load or cause axle bounce

Good point. Henry Ford solved that problem with a torque tube.

[Terry Wilkerson]

The car is a stock 239 flathead. So with that said what should the rear end angle be taking into consideration the trans is at 4 deg.

[ford38v8]

The age of your original springs may account for the difference in angles. Prior to 1949, torque tubes prevented wrap, ensuring that angles remained equal.

[ford38v8]

You’re going to a lot of work to change the differential for what reason? If you were changing out the engine and transmission also, that might make sense.

[V8COOPMAN]

Originally Posted by ford38v8

Good point. Henry Ford solved that problem with a torque tube.

Henry solved a lot of problems with a torque tube!

Coop


.

[tubman]

Originally Posted by V8COOPMAN

Henry solved a lot of problems with a torque tube!

Coop.

And caused a few as well.

[ford38v8]

Originally Posted by tubman

And caused a few as well.

I can’t think of one. Enumerate please?

[Terry Wilkerson]

Originally Posted by ford38v8

You’re going to a lot of work to change the differential for what reason? If you were changing out the engine and transmission also, that might make sense.

I'm not changing it out for fun. It's shot. As for a lot of work
I took it out in about 3 hours today.

[tubman]

Originally Posted by ford38v8

I can’t think of one. Enumerate please?

Changing a broken axle, for starts.