leigh Posted December 22, 2009 Share Posted December 22, 2009 Hi, I have a 1991 2.5 petrol ninety, with (I believe) an LT77 gearbox. When in reverse, it makes an awful whiring noise. It is also impossible to get it into 5th until its warmed up and at a decent speed (55mph+). Any suggestions as to the problem and solution very much appreciated. I am planning on an oil change in the next week or two as there is a lot on oil on the gearbox, so maybe not so much in it! Thanks Leigh Quote Link to comment Share on other sites More sharing options...
errol209 Posted December 22, 2009 Share Posted December 22, 2009 Hi, I have a 1991 2.5 petrol ninety, with (I believe) an LT77 gearbox. When in reverse, it makes an awful whiring noise. It is also impossible to get it into 5th until its warmed up and at a decent speed (55mph+). Any suggestions as to the problem and solution very much appreciated. I am planning on an oil change in the next week or two as there is a lot on oil on the gearbox, so maybe not so much in it! Thanks Leigh How long have you had the ve-hicle? "Awful whiring" is correct when compared to any modern car! If the box is low on oil and / or has the wrong stuff in it, it can make it very hard to get any gear in a cold box (repeat to self, ATF not EP90 ... ) Sounds like that would be a good first stop. Just as an aside, does the aforesaid 'whiryness happen as badly if you put it in reverse with the transfer box in neutral too? Quote Link to comment Share on other sites More sharing options...
leigh Posted December 22, 2009 Author Share Posted December 22, 2009 I've had the ninety for a month or so, but I've had a 200tdi disco previously, which didn't sound anything like this! I will try it with the transfer box in neutral tommorrow. I guess by this suggestion your thinking the transfer box might be the problem? Quote Link to comment Share on other sites More sharing options...
jbs Posted December 23, 2009 Share Posted December 23, 2009 They(L/R) now say to use MTF in the main box and not ATF as the ATF doesn't have enough protection in it so to speak for the main box, Personally after a recommendation from someone I now use MTF 75 and this has made a hell of a difference to mine-smoother changes and also a much quieter main gear box, Also using synthetic EP 90 in the transfer box and axles has also made a difference too Quote Link to comment Share on other sites More sharing options...
leigh Posted December 23, 2009 Author Share Posted December 23, 2009 I tried the landy in reverse with the transfer box in neutral - no noise to be heard. But the noise is there in both high and low ratio, so does this point to anything?! I also tried rolling backwards in neutral, and couldn't hear anything, so I'm guessing this rules out diffs? Quote Link to comment Share on other sites More sharing options...
oap Posted December 23, 2009 Share Posted December 23, 2009 Yeah transfer box problem, I think. Change the oil first use ep90-gl4 not gl5 and it may solve the problem. Quote Link to comment Share on other sites More sharing options...
leigh Posted December 24, 2009 Author Share Posted December 24, 2009 GL4, not GL5, righto will do. As soon as I've done christmas! Hopefully 2010 will bring quiet reversing... Quote Link to comment Share on other sites More sharing options...
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