• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Any ideas?

startech47

Jedi Knight
Offline
My son's 1979 Midget 1500 was quiet after restoration, but now has a whine when driving. There are only a few miles on the car since it was restored. There is no noise in reverse, 1st, or 2nd. There is a slight whine in 3rd and a louder whine in 4th. I'm trying to determine if it is the rear or the transmission. The transmission was rebuilt (new bearings, syncros, and gaskets. Nothing was done to the differential. Does anyone have a differential and/or a transmission for sale. The differential ratio does not matter as I am planning on using it to test by substitution. Easier to change the rear than to pull the engine. If it's the transmission I was thinking maybe the rear bearing has gone bad. Thanks for any ideas. Phil
 

Stick

Freshman Member
Offline
You shouldn't need to swap the diff to see if that is the cause of the noise. Try various gears at a constant speed, if the whine goes away or gets worse then I would say the problem isn't in the differential because it is moving at the same rate at a given speed regardless of what gear you are in. Same goes for the output shaft on the transmission as a matter of fact.

I have a similar problem on my car, most pronounced in 4th but sometimes present in 3rd. Also, in my case seems to only whine under acceleration. I know my transmission needs rebuilt anyway so I haven't worried about it since I'm in the middle of swapping in a new motor/trans anyway.

Sorry I don't have a solution, although I imagine it is a common issue. Hopefully I can at least help you rule a few things out.
 

jlaird

Great Pumpkin
Country flag
Offline
Aye, check the fluid level first.
 
OP
startech47

startech47

Jedi Knight
Offline
The levels in both were correct. I'll re-check both and check for metal flakes as well. Last time the car was on the road was in the fall. As I remember the whine was loader with increased load. I'll check that as well.
 

radibob

Senior Member
Offline
The whine is louder in 4th than 3rd because you are going faster. Same thing with it only being audible on acceleration because that's where the wear is in the differential. Classic case of worn diff.
The good news is that it will go FOREVER like that if you can stand the noise. It's difficult to find a used one that won't whine. What I suggest is to warm it up and drain it, then fill it with a good grade of SYNTHETIC diff oil, like Red Line if they make diff oil. This made a huge difference in mine.
 

bgbassplyr

Darth Vader
Offline
Whine in 4th is diff because trans is straight through, no gears pulling against each other.
 
OP
startech47

startech47

Jedi Knight
Offline
Thanks for the latest comments. I'll try the drain, refill, and another road test. I am leaning towards the rear since the trans was rebuilt. In fourth there shouldn't be much load on the output shaft bearing.
 
Similar threads
Thread starter Title Forum Replies Date
L Tyre diameter less than 680mm but bigger than 640mm, any ideas? Austin Healey 11
Y MGB Battery relocation ponderings and considerations [and ideas?].... MG 6
pbraun Ideas on tires for Bugeye with 13x6" wheels Spridgets 3
nathandarby67 Ideas for organizing hardware when plating Restoration & Tools 6
BoyRacer Ideas needed for under dash radio mount, cup holders, glove box Austin Healey 39
Sarastro General Tech Any good ideas for removing liners? Triumph 20
Sarastro TR4/4A Any ideas for repairing jack damage? Triumph 13
Jim_Gruber Need your ideas on a How To Do it - SpeedHut Gauge Install Spridgets 11
Rut TR4/4A Shop with lift ideas Triumph 21
maxwedge5281 third brake light ideas Austin Healey 34
B TR6 Seat Belt Brackets - Any Better Ideas? Triumph 1
M TR4/4A Covers at side of H frame over the trans tunnel...ideas please. Triumph 9
M General Tech Creative ideas, shop equipment, fabbing techniqes, etc Triumph 0
chuckmcb Baffled by BJ8 Ignition light...any ideas? Austin Healey 9
M Ideas for an Alloy Racer Austin Healey 13
trotti Stuck drum - any ideas? Austin Healey 5
CJD TR2/3/3A Engine Storage Ideas Triumph 2
T TR4/4A Lowering my TR4a - ideas? Triumph 18
catfood Any Ideas? Austin Healey 7
aeronca65t Christmas Card ideas Other British Cars 5
RickB Any temporary Bugeye grille ideas while I send mine off? Spridgets 16
bthompson Using the brakes kills the engine! Any ideas why? Spridgets 17
I Bugeye bonnet hinge bolt head busted off - ideas? Spridgets 8
RJS Top Frame Repair - ideas needed Triumph 8
Mychael Ideas for a parcel shelf in a Frogeye Spridgets 8
T ideas on fixing - one carb keeps "rusting" Triumph 4
I TR6 TR6 difficult to start - ideas? Triumph 6
M Any Ideas Triumph 26
K Any ideas for a Handbrake Warning Light??? Triumph 11
bighealeysource ideas on how to fix dents on frame Austin Healey 15
Darrell_Walker Alternator cleaning ideas Triumph 10
ahealey1004 bn4 drum brake issues...any ideas? Austin Healey 7
apbos TR2/3/3A Ideas for moving my TR3a????? Triumph 4
M 948 vs 1275 - Looking for opinions and ideas Spridgets 34
Brosky Upholstery makers in England? Any ideas? Triumph 21
T Ideas on fixing this? Triumph 19
eschneider leakdown test readings - ideas? Restoration & Tools 12
D help...? Air Filter ideas needed...nothing fits! Spridgets 23
A TR4/4A TR4 mistery engine problem - any ideas Triumph 14
gubba Slight front end shimmy @ 52 mph any ideas? Triumph 13
T Ideas on getting this bolt unstuck Triumph 42
RickB New steering wheel, ideas about adapting? Spridgets 23
bighealeysource Ideas on where to get ID plates stamped Austin Healey 3
M Need Engine Swap Ideas for '76 Midget Spridgets 21
T TR2/3/3A TR3A vibration - looking for ideas Triumph 38
RickB Ideas about modifying seats to fit rollbar? Spridgets 6
R front emblem rehab ideas??? Triumph 16
scubabatdan Ideas on cleaning a yellowed rear window? Spridgets 1
bmurphy7369 Let's Help Basil with Recent Cost Issues, Ideas... Austin Healey 0
bmurphy7369 Let's Help Basil with Recent Cost Issues, Ideas... Spridgets 0

Similar threads

Top