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gearbox problem

Posted: Wed Dec 30, 2009 8:34 pm
by caterpilla
hey guys just wonderin if any 1 could help me out ? i got a 1988 5L turbo diesel with all 1997 parts. 5th gear is a bit noisy and i have to hold 1st gear in till i start moving otherwise it doesnt sit in properly any 1 with any suggestions? or any 1 got a spare gearbox layin around or wanna sell?

cheers Chris

Posted: Wed Dec 30, 2009 10:07 pm
by sonny
im not sure if it applys to you but my 60 series sounded like it had a noisy diff/box.i pulled the tail shaft of it only to find the pinion nut was only finger tight!!!these have to be at like 180 pounds so after putting a new seal and a speedi sleve on the pinion as it was worn its running like a charm.
i found with mine 5th gear was the worst noise then 4th wasnt so bad then 3rd was hardly noticable,must have been the back lash.

Posted: Wed Dec 30, 2009 10:31 pm
by a1 mech
hav you checked the oil quality and level in the box?

Could be worth checking the output flange nuts but its most likely a noisy synchro, the flange nuts hav to be at 90 foot pounds.

Try some of the nulon gearbox treatment in the oil, works a treat on shifts and noises.

Posted: Wed Dec 30, 2009 10:31 pm
by caterpilla
sonny wrote:im not sure if it applys to you but my 60 series sounded like it had a noisy diff/box.i pulled the tail shaft of it only to find the pinion nut was only finger tight!!!these have to be at like 180 pounds so after putting a new seal and a speedi sleve on the pinion as it was worn its running like a charm.
i found with mine 5th gear was the worst noise then 4th wasnt so bad then 3rd was hardly noticable,must have been the back lash.


hey mate the fella i bought it of rekons a split bearin in 5th? but im unsure and thers no noise in the other gears except for 1st gear (but thats only when im first taking off) if i dnt phsicaly hold it in 1st gear but once its movin it doesnt make a noise at all
i can take of in 2nd no troubles at all
so realy only noise in 5th gear

any 1 know or think they mite know?

Posted: Thu Dec 31, 2009 9:31 am
by a1 mech
Pull the shifter off and see why it is popping out of gear, the bush could be missing or bunched up, start by changing the oil and using sum decent additive.