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May 16, 2017, 2:30pm Report to Moderator

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Afternoon All,

Have just completed resurrecting a Stag with MOD gearbox, Whining noise from 'box in 1st, 2nd and 3rd, also some whining in neutral;  fine in 4th gear. Hasn't dropped out of gear in 100 miles so far.

Floor carpets are missing, as is rear seat, so that won't help things. Oil was changed to "TRIPLE QX EP 75w90 Transmission Fluid Fully Syn".

I plan to try an additive, but I'm concerned about creating issues with the overdrive. Comments and suggestions please!

(100 miles "testing" today, I'd forgotten what an involving car the Stag is)
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May 16, 2017, 2:33pm Report to Moderator

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If not in direct drive, i.e. 4th, then something that isn't involved with that gear may be the problem.  Layshaft isn't in use in 4th but is in 1st to 3rd.
It may help to start there.


Triumph Stag, Man. OD, RHD, Datsun 280ZX halfshafts and Subaru Legacy/Forrester R160 differential, Revolution 15" alloys. Fully rebuilt 2014.  
Triumph 2500TC, LHD, Autobox, PAS, Sunroof, Cosmic alloys.
CT Holland member.
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May 16, 2017, 6:00pm Report to Moderator
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Quoted from StagNL
If not in direct drive, i.e. 4th, then something that isn't involved with that gear may be the problem.  Layshaft isn't in use in 4th but is in 1st to 3rd.
It may help to start there.


i agree, sounds like layshaft bearings, noise will probably go when clutch is depressed when stood still?
ps, welcome to the forum
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Richard B
May 16, 2017, 10:30pm Report to Moderator

Richard Brake
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I was always told, don't add things like Slick50 to an overdrive, it causes the O/D clutch to slip.

Surrey AO and Triumph Hoover, Location: Guildford - Surrey,
Spitfire 2.5PI - 1967 having surgery, PI Saloon - 1969 RBRR x 3, PI Estate - 1969 (to restore), Stag - 1971 RBRR x 2,
PI Saloon MkII - 1971(stalled project), Sold some cars!  

Daughters own: Herald 1500 1961, Herald 1500 Coupe 1962, Dolomite 1300 1976, Herald 13/60 Estate 1970
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May 16, 2017, 11:04pm Report to Moderator

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Another possibility is the small bearing between the input and output shafts.  It only turns when not in 4th gear; and was making noise (worse than just a whine) in my first Stag when I bought it.
If that is the problem, be sure to check the "dowel bolts" that locate the gearbox to the flywheel housing, and the dowels that locate the housing to the rear plate and the rear plate to the engine block.  If any of those are missing or have the wrong piece installed, it can allow the gearbox to be out of line with the crankshaft and put a lot of pressure on that little bearing.  I couldn't find a source for the "dowel bolts" (which have a precision full diameter shank, not the slightly undersize shank found on normal bolts), so I made my own by threading a section of "drill rod" (precision ground steel rod) for nuts on both ends.

I agree about not trying to quiet the noise with additive.
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May 18, 2017, 6:03am Report to Moderator

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Thanks for the quick replies. To add another variable, the engine is an RV8, so the adapter plate to the bellhousing could create a risk of misalignment. My understanding is that older manual boxes for Stags are noisier than newer boxes. The car is 1975, but the age of the gearbox in unknown.

The whining noise in neutral does disappear when I dip the clutch.

I probably need to fit the carpets to see if that helps.
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Toledo Man
May 18, 2017, 6:14am Report to Moderator

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Additives in an OD box is a definite no-no. Just use a decent quality gearbox oil of the correct spec.

Toledo Man

HCR 2006 & 2007 finisher
1972 Dolomite 1850 auto (The rolling restoration)
2008 Citroën C4 Grand Picasso 2.0 HDi Exclusive (the modern)
Former stable of 5 Acclaims, 1 Toledo, 2 1500fwd, 1 1300fwd, 1 Dolomite 1300 & 1 Dolomite Sprint (that's just the Triumphs!)
I've still got some parts for sale...
Check out my Blog on

"I can help you stop smoking in bed. Buy a waterbed and fill it with petrol." - Bob Monkhouse OBE (1928-2003)
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Pete Lewis
May 18, 2017, 6:22am Report to Moderator

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Yes ,  most   certainly input shaft bearing or mainshaft tip  
if box has been stood up on its clutch hsg , you get debris drain into the input bearing.

its one of the first to suffer if oil has been low

layshaft and spigot is not as troublesome as the small chassis box  and generally more bullet proof.


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been stored without running since 1997
now has power steering
location  Luton
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May 20, 2017, 3:59am Report to Moderator

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Don't know....recently had my 2500 box and J type o/d overhauled, box was very noisy. Main problem was a badly worn layshaft. Nice and quiet now.

If all else fails-Read the Instructions! ��Wairoa
New Zealand

1976 2500TC (converted to S spec
1979 2500 S.
1999 BMW 2800 cc Z3 Convertible.
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