1950 ford custom/1990 ranger rear end install.
 

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?

Re: 1950 ford custom/1990 ranger rear end install.
 

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

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

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 ?

Re: 1950 ford custom/1990 ranger rear end install.
 

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

Re: 1950 ford custom/1990 ranger rear end install.
 

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

Re: 1950 ford custom/1990 ranger rear end install.
 

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

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

Henry solved a lot of problems with a torque tube!

Coop


.

Re: 1950 ford custom/1990 ranger rear end install.
 

And caused a few as well.

Re: 1950 ford custom/1990 ranger rear end install.
 

I can’t think of one. Enumerate please?

Re: 1950 ford custom/1990 ranger rear end install.
 

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.

Re: 1950 ford custom/1990 ranger rear end install.
 

Changing a broken axle, for starts.