[Fot] Quaife and 4.1 Installation Issues TR3

[Bob Davis]

On 7/8/11 2:42 PM, Barry Munson wrote:
> Amici - I have purchased a new Quaife directly from Quaife UK, a new 4.11
> gear set and a complete set of new bearings for installation in a Southwick
> conversion TR3 differential housing. In what should have been a relatively
> simple installation process has proved to be one royal PITA. Simply put with
> the pinion installed with the correct preload, even with all the shims moved
> to one side of the carrier there is no way to get any backlash.
>
> This has been driving my installer crazy as they have checked, several
> times, all the dimensions, bearing and cage heights. It appears that the
> Quaife cage is 1.2 mm taller than the stock cage. I have phoned the Quaife
> tech line twice and sent a number of e-mails requesting assistance and
> received the following response: "I think that our diff only fits with the
> 3.75 ratio directly, the only option will be to Machine the crown wheel
> face."
>
> While this seems odd to me as the 4.11 ratio was a factory option I thought
> that I would seek additional expert advice.
My Quaife with new 4:11 gears and bearings fits the TR3 Southwick 
convers just fine. You must have something else going on.

Bon
> So my question to the group is:
>
> Has anyone experienced any difficulties installing a Quaife and a 4.11 gear
> set in a TR 3 or 4 differential housing ( I'm assuming that the Southwick
> conversion will have no bearing on this issue) and, if so, how did you solve
> the problem?
>
>
>
> Additionally, if machining the crown wheel face is the solution then how do
> you determine how much to machine it - Quaife have been silent even when the
> question was put directly to them.
>
>
>
> As always thanks for any help/advice provided.
>
>
>
> Barry.
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