Whine from diff when pulling from low speed in 3rd & 4th

[french dave]

Hi,mk 1 Tasmin has above problem.otherwise diff /gearbox ,rear axle runs smooth.Not particularly loud but being 4 speed its more of an annoyance.Could an oil change (diff) help.?best oil to use? Car has done just over 40,000 miles.Doesnt whine until car warmed up.dave

[mrzigazaga]

Hi


Have you ever topped up the diff?...I used this in mine and seems all good for the last 3 years...I have mine topped up and UJ's greased very 6 months.

https://www.classic-oils.net/Penrite-Pro-Gear-75W-...

Ziga

[Adrian@]

3rd and 4thGears run via the lay-shaft on the 4 speed. Noises through all gears relate to main shaft bearings (perhaps diff) and 3/4 to worn layshaft/layshaft bearings. A@

[adam quantrill]

Keep your mind open to possibilities when there are noises from the rear. They can be very hard to locate.

I had a whirring and actually replaced the diff, to find eventually it was a wheel bearing, noisy (at speed) but not slopping about. I eventually pinpointed it with the help of a contact microphone.

What also doesn't help is that even when everything is working properly, a wedge can be pretty noisy due to the engine, exhaust, wind noise etc when compared against contemporary cars, let alone modern cars.

Edited by adam quantrill on Monday 11th March 12:15

[mrzigazaga]

Adam has a good point there...and sometimes these noises are heard at the front which will confuse you even more..I had a worn rear wheel bearing but it never made hardly any noise and there was no initial play when checked...however at the MOT 3 months later there was an horrendous amount of play..check up & Down...left to right and in & Out movement of the rear wheel..also check your rear N/S hub nut...I would also check inner and outer UJ's.

[indigochim]

It's worth an fluid change on the diff if it's not been done for a while. Mine was well in need of a change when it was making a noise I think most of the noise was from a failed bearing that was changed at the same time. It would appear that greasing bearings, UJs and refreshing difficult to access fluids is optional on many services.

[mrzigazaga]

indigochim said:

It would appear that greasing bearings, UJs and refreshing difficult to access fluids is optional on many services.

Mine is done by a good friend who is a mechanic by trade...he owns TVR's so he knows the bobby...