Reply to "1/2 shaft rebuild"

There are two similar looking halfshaft assemblies commonly found on Panteras: stock and Spicer. Neither are labelled but if you have Spicers, they take industry #1350 u-joints, also used in F-500 Ford trucks; the u-joints may be labelled 'Spicer'. If you have stock halfshafts, they use #1410s. You're far better off calling your favorite vendor, as things can go wrong really fast shopping these off the internet. Retaining c-clips differ a few thousandths in thickness and some combinations simply will not fit together in your axle parts; some brands of u-joints come with two thicknesses of c-clips, but internet shippers may not include both sets. One rapidly eats up a $3 savings/assembly chasing ill-fitting parts.

NOS Pantera u-joints back in the '70s seemed to be hardened all the way through, making them a bit brittle, as are some current far-east assemblies meant for low-torque 4 cylinder vehicles. Then there's the question of using a grease gun into zerk fittings (that may or may not be included) vs hand-greasing brand new joints without zerks or their drillings. U-joints often come NOT pre-greased, but only have a thin layer of storage presevative. Running on preservative alone guarantees trouble at an early date. And in my experience zerk fittings and their drillings do NOT 'weaken' u-joints. Quite a few 600 bhp Panteras run around open tracks with them, trouble-free.

Below is a sizing table if you have a precision caliper or micrometer available and are still gonna try saving a few bucks-
Series Dimensions Cap OD
1310 3.219" 1.062"
1330 3.625" 1.062"
1350 3.625" 1.188"
1410 4.188" 1.188"
1450 4.188" 1.375"
* 1350 Series Spicer Greaseable Universal Joint
measurements:
Dimension= 3.625" wide in both directions with caps on. All 4 bearing caps are 1.1875" diameter. All 4 use Outside type snap-rings.

Note that swapping caps around as the above table seems to indicate, does not guarantee that your assemblies will fit, either. Finally, the needed press-fit seems to vary in 40-year-old Pantera forged-steel companion flanges, and some stock flanges are now plain worn out. There is no known fix for a loose-fitting flange beyond replacement. No one currently makes them; I've made a few from 7075 aerospace aluminum and it's a real chore to get them sized right.

Sorry for being so long-winded but this subject comes up every few years re Panteras, and there's an enormous amount of non-info floating around the Web. Trying to control 300+ bhp with cut-rate u-joints will definitely give you problem$$$. IMHO there are better places to save money than in your supercar's driveline, brakes or steering. PM me if you have further questions.