[Cromp85]

Have you got your gearbox sorted yet?
I rebuilt a PG1 gearbox last year so have done a bit of research beforehand.
This is one of MGJohns threads on PG1 bearing change:
https://www.mg-rover.org/threads/pg1-to ... ft.451178/

Here is a list of the bearings used in the box:

Input shaft (Bottom)
CDU66, 3/MJ28, Koyo. 63/28 (Also used in a Honda Goldwing)
Input shaft (Top)
Standard (75mm od) CDU74. 4/MJ28. PFI. BB1B362021.
Turbo X or U spec gearbox (78mm od) CDU73. 3/LJ28. NTN. SCO690.

Countershaft (Top)
Standard CDU78. 3LDJK25. NSK BD2549T1XNXCA24.
Turbo U and X spec have two bearings, Ball bearing is. CDU79. 43/LJ25. NTN OPG2SX05A45NCS08.
Roller is. CDU80. 3/LRJA25. NSK M25-9

Countershaft roller bearing (Bottom)
Standard & Turbo X spec gearbox (33mm shaft). CDU 68. 2/LLRJ33. NTN 8E-NK33X60X20-9
Turbo U spec gearbox (35mm shaft). CDU67. RJ2024. NSK. VP35-6

Differential bearings CDU85, 6208 C3 (This is a standard bearing size)

[JOHNDQ]

Rebuilding the PG1 is easy the only trouble I've have with mine and a few of the others I've done lately is getting some of the correct shims for the output shaft and correct thickness circlip for the diff bearings

[aboardepsilon]

I've just found my sequence of pictures for rebuilding the box 32 pics

if this site has its own picture host ,...I can upload them with directions

all the best.mark