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qkingston

IRS Diff Mounting

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So I have read much about the weakness in the IRS suspension front & rear. Having taken the body off this weekend I can see that although the chassis is very sound (even patches of original chassis enamel black), the front diff mounting bridge has some damage, picture attached. I guess the CTM strengthening kit will help sort this out, do I need to do any other repair to sort out the steelwork? Also found that the bracket on the rear diff mounting has damage on one side, I think theses brackets are replaceable/available? What is the mechanism that causes this damage, is it just the suspension forces on the diff mounts punching upwards into the mounting/steel bridge piece?

 

Appreciate your wisdom

 

Rgds

 

David

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So that would explain why it's front right and rear left mounts?

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Hi David,

these are common areas on the TR5 & 6 because of their higher power etc.

Less so on the TR4A but still happens.

 

Roger

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Looks like your rear mount has had a plate welded to it before.

 

Since you have access, strengthen the mounts with some ~2mm thick sheet around the pins and 'box-in' the sides of the mounts...easy to do, no need for a special kit. Be careful about creating a rust trap, make sure the box you build can drain and is accessible to squirt some wax in it once the body is back on.

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This mod may help mitigating the effect of the torque reaction. CTM will do it on request though I don't believe it's in their standard set of strengthening kits. Paul Anderson (TR4A1965 on here) did it during his resto a couple of years back.

 

 

 

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You could also check the rear crossmember welds to the frame and perhaps add some gussets and box in the bottom with some suitable drainage. Triumph is asking a lot of that flimsy sheet metal crossmember.

 

Stan

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