Ah, ok thanks.
I have the 741 case, I don't see an X stamp on it, this is a '67 Canadian Monaco that came with poly 318 and 727, so I guess the pinion is the 1 3/8 shaft, I don't know the spline count. This also has implications for the correct axle bearing P/N's ? And seals? I remember having to buy several different U-joints to get the right size.
Following is some select information on part numbers and verbiage about universal joints excerpted from my old "
A Chrysler 8-3/4" Rear Axle Guide". I've trimmed it for the specifics for the '741' case, although some things like the axle outer bearing and universal joints are shared by all 8-3/4" axles. Bearing numbers are Timken base numbers. Many manufacturers use the base within their own numbers. There are more brands available for all the parts than are listed here. Chrysler numbers listed were the latest superseded numbers when the guide was written.
FYI...
Gaskets and Seals for 1820657 and 2070741 case 8-3/4" axle
| Position | Chrysler | National | C/R | Fel-Pro |
| Axle inner seal | 4796698 | 8695S | 15460 | --- |
| Axle outer seal | 2404216 | 8704S | 19000 | --- |
| Axle flange, foam | 2070933 | --- | --- | 13800 |
| Axle flange, shim | 2881314 | --- | --- | 55032 |
| Carrier gasket | 1673367 | --- | --- | RDS 65833 |
| Pinion seal | 2404121 | 8515N | 18708 | --- |
| Yoke repair sleeve | --- | 99187 | 99187 | --- |
Bearings for 1820657 and 2070741 case 8-3/4" axle
| Position | Cup/Cone. Set or Kit | Brand, Note |
| Differential, side | 25590/25520 | Timken, BCA |
| Pinion, front | M88048/M88010 | Timken, BCA |
| Pinion, rear | HM89446/HM89410 | Timken, BCA |
| Axle, outer | A7 | BCA (65-74) |
| Axle, outer | BR7 | Chicago Rawhide (C/R) (65-74) |
| Axle, outer | Set 7 | Timken (65-74) |
| Axle mounting flange repair kit | Left # A-7-LK,
Right # A-7-RK | BCA (65-74) |
| Axle mounting flange repair kit | Left # A7-LK,
Right # A7-RK | Chicago Rawhide (C/R) (65-74) |
| Axle bearing service kit | 3683966 | Chrysler (65-74) |
Universal Joints and Yokes
Universal joints for the 8-3/4" rear axle are relatively straight forward, with only two sizes/types for most applications, and a third only for certain applications. Which of the two most common sizes are types were installed in a vehicle might not always be clear, but is easy to determine from observation and measurement.
The 8-3/4" rear axle was offered with two size cross & roller style universal joint. These are referred to as the '7260' (2-1/8" yoke ID) and the '7290' (2-5/8" yoke ID). Most Imperials and some C-bodies used a different universal joint. The '1330' type joint was used on Imperials and others with a constant velocity joint. The '1330' uses outside snap rings instead of the inside snap rings used by the '7260' and '7290'. The cap diameter for the '7260' is 1.078". The cap diameter for the '7290' is 1.125". The '1330' style joint cap diameter is 1.063".
7260 and 7290 are reference numbers, but not part numbers, for the smaller and larger cross and roller universal joints commonly used in most Chrysler passenger cars and light trucks from the late 1950s into the 1990s. These were made by the Chrysler Detroit Axle Plant, as well as propeller shafts (aka drive shafts), axle shafts, rear axle assemblies, yokes, etc. The plant operated from 1917 (under Dodge Brothers until 1928) into 2010 on Eldon Avenue in Detroit, Michigan.
There are four different yokes that have been used with the 8-3/4" axle for the '7260' and '7290' style universal joints. The '741'/'742' assemblies used a coarse spline (10 splines) drive pinion. Most of the aftermarket gears also use this coarse spline yoke mount. There is a small yoke for the '7260' and a larger one for the '7290'. The '489' assembly used a fine spline (29 splines) yoke. Two additional yokes were used for the '1330' style universal joint in constant velocity applications, one for 10 splines and one for 29 splines.
NOTE: During the phase-in period of 69-71 for the '489' unit, there were several permutations of pinion size and yoke availability. 69-70 '489' units may be equipped with a coarse (10) spline pinion, particularly for the '7290'. There are two yokes for the '7260' and '7290' universal joints with fine (29) splines.
Universal Joint
(Detroit reference) | Chrysler
(OEM or DC/MP) | Precision
(Moog) | Dana
(Spicer) | TRW
(FederalMogul) |
| 7260 joint | 4364400 | 315G | 5-1306X | 20030, 20030P |
| 7290 joint | 4057025 | 316 | 5-1309X | 20059, 20059P |
| 1330 joint | 2533202 | 354 | 5-213X | 20064, 20064P |
| Combination | --- | 347 | 5-527X | 20226 |
| 7260 strap kit | P4120468 | 318-10 | 2-70-38X | 20704 |
| 7290 strap kit | P4120469 | 492-10 | 2-70-28X | 20705 |
- The combination joint is a combination of the 7260 and 7290 universal joints to allow mating of the two styles.
- The 'P' on the TRW number is the performance/heavy-duty version.
- DC/MP = Direct Connection/Mopar Performance.
