Phil Siddall Posted May 27, 2021 Report Share Posted May 27, 2021 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! Link to comment Share on other sites More sharing options...
johny Posted May 27, 2021 Report Share Posted May 27, 2021 doesnt sound like diff as if it was that bad it would have gone bang by now! I take it the engine and gearbox rubber mounts are all in good condition? Link to comment Share on other sites More sharing options...
Nick Jones Posted May 27, 2021 Report Share Posted May 27, 2021 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 Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 27, 2021 Report Share Posted May 27, 2021 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 Link to comment Share on other sites More sharing options...
Phil Siddall Posted May 27, 2021 Author Report Share Posted May 27, 2021 Hadn't thought of the engine/gearbox mounts- will have a look tomorrow. Thanks. Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 28, 2021 Report Share Posted May 28, 2021 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 Link to comment Share on other sites More sharing options...
Phil Siddall Posted May 28, 2021 Author Report Share Posted May 28, 2021 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.. Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 28, 2021 Report Share Posted May 28, 2021 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 Link to comment Share on other sites More sharing options...
johny Posted May 28, 2021 Report Share Posted May 28, 2021 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... Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 28, 2021 Report Share Posted May 28, 2021 i always tie a luggage label on NO OIL !!!! 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 29, 2021 Report Share Posted May 29, 2021 one of my locals i rebuilt the box and he came round about this awful racket in every gear he is now named No Oil Mick this hic up has got the same Tee shirt as leaving the sump plug out ha !!!! Pete 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now