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Re: [TR] Replacing or rebuilding TR3A differential

To: "'Dave MacKay'" <>, <>
Subject: Re: [TR] Replacing or rebuilding TR3A differential
From: <>
Date: Thu, 2 Jul 2020 10:39:36 -0700
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Any competent off road shop can do this for you, my experience has been that if 
you bring them the parts, they can run through it in a few hours.

I replaced a broken ring and pinion on my TR3 a few years ago, the shop labor 
was less than $200

-----Original Message-----
From: Triumphs <> On Behalf Of Dave MacKay
Sent: Thursday, July 2, 2020 9:24 AM
Subject: [TR] Replacing or rebuilding TR3A differential

The pinion gear in the 3.7:1 differential of my 1960 TR3A (s/n 68639L) broke a 
couple of teeth so that now I need to rebuild the differential and replace the 
crown and pinion gears. Iâ??m intimidated by the repair because it looks like 
the repair requires more expertise that I have and because the TR3 service 
manual specifies special Churchill tools that I donâ??t have and that seem to 
be unavailable.

The idea of replacing the differential rather than rebuilding it holds 
considerable appeal. Iâ??d welcome any suggestions from the list about
- Where I might be able to source a working diff to replace mine with?
- Any readily-available rear ends that I might be able to swap in (e.g., from 
another model or make of car)?

If a replacement isnâ??t feasible, Iâ??d appreciate input from the list about:
- Shops/mechanics that have experience rebuilding Triumph differentials
- Where I could buy/rent/borrow the special Churchill tools that the service 
manual specifies
- Alternatives to the Churchill tools (S101, M84, S4221, S103, M70, TS1, M85, 
- Advice about other tools that will be needed (e.g., what size press) or 
outside services that would make the job easier

Of course any tales from those that have been there/done that would also be 


Dave MacKay
1960 Triumph TR3A, s/n 68639L
near Toronto, Canada
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