Popular Post garrycol Posted October 5, 2015 Popular Post Share Posted October 5, 2015 Anyone familiar with 101s will know of their front driveshaft design issue, commonly called the "101 Rumble" where the front driveshaft causes mild vibration and noise on the overrun above about 90kph. There are two ways this can be reduced - the first is rotating the front axle housing up 17.5 degrees which is a fairly big job and I am not wanting to go this route. The second way is to lower the engine/gearbox on the drivers side so reducing the steep angle of the front driveshaft. HOWEVER I am not sure what the recommended amount is for lowering the engine and gearbox. Does anywith 101 knowledge know how much to lower? For those who might want to suggest modifiying the driveshaft, I can assure you that tis has been looked by many, many people over the years and variations have not been successful. Maybe a shaft with CVs at either end would work but be expensive to build - likewise a D2 style shaft with a double carden has proven not to work. So I would appreciate advice on how much to lower the engine. Thanks Garry 10 Quote Link to comment Share on other sites More sharing options...
garrycol Posted October 7, 2015 Author Share Posted October 7, 2015 I guess there are no 101 people on here at the moment Quote Link to comment Share on other sites More sharing options...
Fatboy Posted October 7, 2015 Share Posted October 7, 2015 I've got one Gary, and I do read all of your posts in interest because one day, I'll make a start on mine. Unfortunately my hands are currently full with a bunch of other projects so there is not a lot I can contribute. Quote Link to comment Share on other sites More sharing options...
garrycol Posted October 8, 2015 Author Share Posted October 8, 2015 Hi Donald - yes there are not all that many 101s around these days so it is hard at times to find information specific to the vehicles but that goes with the territory. I hope you get some time soon to do some work on yours and get some use in. They are a great vehicle to drive. Cheers Garry Quote Link to comment Share on other sites More sharing options...
daslandroverman Posted November 1, 2015 Share Posted November 1, 2015 From experience, a linger front prop seems the best way to eliminate the rumble. The longer front prop on the auto conversion on my old GS never rumbled, contrasting with the manual box which did it regularly above 50mph. Sitec found similar on his 101 with the cummins conversion. Your other option is to fit a set of 4.7 crownwheel/pinion gears, and if so desired a set of lower ratio high range gears (stage 1 perhaps) in the transfer box to lower the rotational speed of the props for a given road speed, as noted above, my GS only did it above 50mph (80kph). Worth asking Andrew what he thinks with the current setup on his truck, as from memory he's got a set of 0.9:1 high range gears, 4.7 diffs and overdrive with a fairly chirpy 3.9 engine. Might be a good comparison if you're thinking on building a reasonably trick 4.6 for it. Quote Link to comment Share on other sites More sharing options...
Ferret65 Posted November 2, 2015 Share Posted November 2, 2015 It seems that the problem is the v8 engine and the way it sits on the chassis rails keeping the gearbox high and a steep angle of the front propshaft. In my Gs I fitted an isuzu 3.1 engine and land rover auto box and made a point of lowering the unit in the chassis rails.There is no rumble and have done away with the annoying gearbox bulge in the rear load bed Quote Link to comment Share on other sites More sharing options...
garrycol Posted November 4, 2015 Author Share Posted November 4, 2015 Thanks for those points - Andrew is loving his 101 but his still have the rumble. The main solution seems to be lowering the engine hence my question. My current front driveshaft is rubber filled to damp out vibrations and has larger UJs with finer needle rollers and while this has reduced the vibration and noise it is still there. cheers Garry Quote Link to comment Share on other sites More sharing options...
Defender Posted December 3, 2015 Share Posted December 3, 2015 I thought that fitting a double cardon propshaft at the gearbox end stopped the rumble (I think gearbox end is correct!). It may be worth an email to http://www.firowpropshafts.co.uk/ I know they have made them in the past for 101 owners and they seem really helpful from the dealings I've had with them. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 3, 2015 Author Share Posted December 3, 2015 I thought that fitting a double cardon propshaft at the gearbox end stopped the rumble (I think gearbox end is correct!). Nope - been done and does not work. Is no better than just keeping the splines and UJs well greased. There are only two proven fixes - rotating the front diff or lowering the engine/gearbox unit. Garry Quote Link to comment Share on other sites More sharing options...
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