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Time for a new diff? 1980 Spit 1500


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Accelerating hard, particularly around 3,000 rpm, there is a sort of grinding noise and vibration I can feel through the gear lever.

On the over- run, the transmission gets very jerky under 2,000 revs.

Has had a recent recon engine and gearbox; UJ's seem ok so I presume diff problems.

Advice to confirm likely cause, please!

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Propshaft bolts still tight?

Also check gearbox mounts, engine mounts and exhaust alignment. Sounds like something is moving under load and bringing parts that should be rubber mounted into contact with the chassis. Torque peak is around 3000 so that’s where everything is at maximum deflection.

Nick

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this sounds more like such as   exhaust fouling the chassis and a  propshaft UJ 

you wont get diff noise/feeling at the gear stick 

diffs  whine or have a rythmical knock if a tooth is damaged 

sorry about the underscore    typo

Pete

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yes under torque the engine /transmission can shift far more that you expect if mounts are poor .

and parts with a gap( like exhausts) can make contact and make a lot of noise vibrations under power 

Pete

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Front engine bearers look fine- haven't had it on the ramps yet to look underneath though.

I am still thinking of the drive train somewhere- if it isn't the diff, could it be the gearbox? definitely a sort of harsh grindy  rattly noise on full throttle

The jerkiness on the over-run below 2,000 revs is pronounced- the gear lever twitches and there are clunks.

There could be a slight chance that this last is engine related, as though it was cutting out and picking up again. A change from points to electronic ignition, plus a new coil, seem to have made no difference, so I am doubtful about that.

I'll post on the gearbox section, to see if anyone has had this problem.. 

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did you re time the ignition when you fitted the electronic unt ????  they are not a straight swap for points and   needs a reset 

on the gear lever does it tend to shift when drive to overrun ??

Pete

 

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The gearbox and diff have got the correct levels of oil havent they? I know it sounds crazy but its been forgotten before, especially after rebuilds😳

If youre going under the car its a good time to check or you could even drain the gearbox first to see if theres any contamination...

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