rear diff gear/pinion gear problems

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matwom

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hi there
i have a fg baja and just lately ive had a reocuring problem.
when using the car there is a grinding sound coming from the rear diff / pinion gears , on inspection i found the diff gear and pinion gear had slightly moved apart and the gears were slipping , so i ajusted the gap and locked it back up. after bashing for 10 mins the same problem happend again ,i kept adjusting and locking it up again and again. i carnt stop this problem / can anyone help
fgbaja.webp
 
Those adjusting screws do thy go in metal or plastic?
It will make deference.
If the screws are going in plastic, best solution is replace plastic part with alloy.
If it is an alloy then blue loctite
 
Make sure to locktite the engine screw in, and the screw that goes into the engine mount from the little metal triangle thing. It is goes into metal, locktite it, if it goes into plastic, super glue it.
 
i use to have the same problem. you have plastic motor mounts, right? i used red loc-tite on it. and alos made sure all the ather motor mounts and rear chassis suports are tight too. im thinking that the metal motor mount set-up will work better.
 
If you super glue the bolt to plastic then you should now if you remove it most probably you will have to replace the part.
If you have plastic motor mounts change to alloy and loctite it.
 
The differential gear and Layshaft gear can round off a bit once they have slipped. Check the looks of the gears and make sure they have not ground down. If the layshaft looks rounded you can take it off and flip it in reverse. If the differential gear is chewed replace it. Its all about your motor mounts. If you can't get the screws to bite real good you could also change them out to longer or bigger screws. Make sure the metal triangle support is tight too.

Keep us updated.:)
 
hi
got to say what a great forum this is , loads of help and advice.
ok ,my car is pretty much standard at the moment ,all the rear diff /tower ect is plastic.ive tuck all the rear off the weekend , cleaned it and lock tiyted the main fixing screws.on inspection of the diff gear and layshaft gear looked ok , just abit worn ,so ill run them and see how it goes.
ill keep you all filled in and cheers for the advice everyone
 
Great to have you here in the forums!

There are many upgrades but the Main gears to alloy, alloy gear carrier and upgrading the rear diff to alloy are some of the 1st, well along with the motor mounts.

Check out all the topics and you will see the different problems and solutions.
 
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