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I've been concerned about the quality of some of the unbranded bearings being sold for diff and gearbox rebuilds, so I tracked down equivalent part numbers and sourced mine from reputable bearing factors.

These are based on the Triumph part numbers for my Spitfire 1500 with 3.63:1 ratio. 

BTB440 - pinion outer.  (Listed as an alternative to 134070)
Timken Part Number M84548 - M84510
1”x2.25 (2 ¼)x0.765 (49/64”)

134065 - pinion inner
Timken Part Number M88040 - M88010
1.1250” (1 ⅛”)  x 2.6875 (2 11/16) x 0.8750” (7/8)
28.575mm x 68.263mm x 22.225

Diff Carrier

GHB105 - diff carrier (to commission number FH106101 equiv. to UKC169?)

LM67048 - LM67010 (TBC!)
(31.75x59.13x15.88mm)

UKC4805 - diff carrier (from commission number FH106102)
Timken Part Number  L68149 - L68110  (TIMKEN set-13? might be the same, it has the same dimensions?)
1.3775“ x 2.3280” x 0.6250”
(34.99x59.13x15.88mm)

 

Not as hard to find, but included for reference:

533360A/128572 Inner axle shaft (output shaft) bearing
bearing part number 6205 C3 clearance 
 25 x 52 x 15mm 
 

Please treat with caution! I'm in the middle of rebuilding my Spit diff with the bearings listed above, everything seems to fit just fine, but there's a chance I made a mistake!

Updated again based on some more research - I'll try and confirm more ASAP

Edited by yorkshire_spam
Additional information

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.... please take care that the output shaft bearing should be with C3 clearance.

For the diff carrier I have the SKF numbers 67048 and 67010

Martin

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Thanks for the info but 4.11 diff or 3.89/3.63/3.27? The 4.11 has some differences from the others...... and there are at least two variants of it.

Nick

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Thanks for the comments guys, I've updated the original post to reflect. Provided the Triumph part number marries up they should be ok for other diffs. If it's considered useful I'll try and expand the list for other diff bearings?

@Martin I'll check those SKF numbers against the Timken ones I have - thanks!

 

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Thanks for that - especially since I've got a couple of 3.63s here, including the one in my car which, after about 45k fairly hard miles, is beginning to cry!

Nick

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Care needs to be taken with the carrier bearings as well though, I've noticed that the Triumph part number changes at a specific commission number. What I'll try and do when I have some time is add the ones for part numbers other than the ones for my diff, so we have a complete set to refer to. Martin has me a bit worried with those SKF part numbers as they are not listed as equivalent to the timken ones I have, so I'm wondering if they correspond to the earlier ones. (Or if I've got the wrong ones?! They do seem to fit well though!)

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I'm pretty sure the references that @Martin has are for the earlier carrier bearings corresponding to p/n GHB105

I'm going to cross check the p/n used in other diffs and see if they are common.

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Great reference, thanks.

Are you sure the output shaft bearings should be C3?  I have just replaced mine, and used the same as removed.  The diff was put together by John Kipping about 25 years ago.

A great source for bearings is "Simply Bearings".  Great choice; prices and super fast delivery (don't bother with express delivery as the standard free delivery comes next day!).

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On 10/1/2018 at 4:08 PM, flatter4 said:

Great reference, thanks.

Are you sure the output shaft bearings should be C3?  I have just replaced mine, and used the same as removed.  The diff was put together by John Kipping about 25 years ago.

A great source for bearings is "Simply Bearings".  Great choice; prices and super fast delivery (don't bother with express delivery as the standard free delivery comes next day!).

I've seen diffs with 6205 and some with 6205C3 for the output shafts, I'd imagine that the C3 is what was specified by Triumph but that it's not in fact that critical (provided that you use good quality bearings in the first place)

Additional Info:

I've cross-checked these numbers against the Dolomite parts book that I have.

Bearings listed for the Dolomite (non-sprint) are 134065, 134070 (pinion) and GHB105 for the carrier, so these part equivalences also cover Dolomite models.

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