The u-joints in the axles have to deal with larger angles and
variable amounts of flexing, while the ones from trans to
frame-mounted diff are almost perfectly straight all of the time.
Driveshaft u-joints in a solid axle car won't last as long as they
have to flex more and have more misalignment continually.
Tony
At 09:08 PM 6/29/2014, Ron L'Herault wrote:
>Last Monday I changed the oil in my 1973 TR-6 and did my nut and bolt check.
>I had a clunk in the rear and though maybe the nuts at the connection to the
>diff had loosened again. They were tight but the U joint had play in it so
>I changed it, fortunately having three of them on the parts shelf.
>Unfortunately I didn't have new nylock nuts so I got on line to the Roadster
>Factory and ordered 4 of them along with a new turn signal blinker unit with
>the hope that a new one would make the lights blink faster. I'd already
>cleaned all the connections and bulb bases which helped a bit. The nuts and
>flasher unit came in on Friday and I decided to do the install today. It
>all went without a hitch. Clunk is pretty much gone and turn signals flash
>at an acceptably fast rate. After cleaning up I took the car out for a
>test drive -which really means that I headed over to the Ice Cream Machine
>for a cone of ginger ice cream. It was such a great day for a ride. The
>weather was PERFECT. However I did get to wondering about the U joints on
>the drive shaft. I have never replaced them on this '73 with 85K on it and
>I never did on my first TR-6 which had 95 K on it when it was wrecked back
>in 1979. Sooooo, why do the rear axle U joints need to be replaced more
>often than the drive shaft U joints. I think the are the same size/part
>number, right?
>
>Grinning still from the nice ride today,
>
>Ron L
>
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