kjn100 Posted February 23, 2013 Share Posted February 23, 2013 Hi (1972 series 3) Gearbox suffix AI have just had the gearbox out to replace the layshaft bearings. I Split the gear box from the, transfer box, bell housing and removed the layshaft to replace the fore and aft bearings. Re assembled with new gaskets etc and reinstalled. All good so far.Gearbox nice and tight, can select all gears fine. However when I engage high range it now keeps jumping out into neutral. Low range is fine with no problems. The strange thing is that I didn't touch the transfer box other than removing transfer gear to detach the gearbox and then to reassemble the whole gearbox.High / low ratio was perfectly selectable before and all components have been reinstalled as they were before. Thanks for any help... Quote Link to comment Share on other sites More sharing options...
blatherskite Posted February 23, 2013 Share Posted February 23, 2013 Something blocking the linkage, preventing proper engagement? Quote Link to comment Share on other sites More sharing options...
secondjeremy Posted February 24, 2013 Share Posted February 24, 2013 Have a look at the boot at the base of the transfer lever - there isn't much travel on the lever into the high position and anything in the way can cause problems. Is the lever on the right way? It can take a bit of fiddling if the bottom brackets have been disturbed. If the pivot is a bolt, does it need spacing or replacing with a bigger one? Are the selector rods themselves free? They can get dirty/rusty and the cover over them above the front output shaft flange can fill with dirt. Removing this, digging out the dirt and cleaning and polishing everything can help. This is more likely to interfere with 4WD High. This is one of the more reliable parts of a Land Rover! Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted February 24, 2013 Share Posted February 24, 2013 Has the transmission been refitted to the vehicle? If not, is the high range 4wd rod fitted? I am not certain that not having the rod and spring under the yellow knob fitted would cause the range selector to spring out of high range. I don't have an unaltered series transfercase to try it. Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 25, 2013 Share Posted February 25, 2013 It's usually due to the red lever's rubber boot. Dirt inside the cover plate with the tubular fingers can cause trouble just like Jeremy said. The other causes are a misaligned selector shaft, set such that the detent groove is not pointing straight up so the ball won't engage properly in it, a weak detent spring (under the brass plug on the low side of the top of the case) or a very worn high range gear on the output shaft that is failing to grip the splines in its hub. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted March 1, 2013 Share Posted March 1, 2013 Had the same problem, mine was the boot....I chocked it for a while before I had time to deal with it! Quote Link to comment Share on other sites More sharing options...
Serious Series Posted March 2, 2013 Share Posted March 2, 2013 Did you take the high low ratio selector stick off the transfer box whilst removing it? If you did have you fitted it with the two bolt bracket at the engine side of its mounting or the transfer case side? it should be at the engine side. Quote Link to comment Share on other sites More sharing options...
RatRodRover Posted July 16, 2021 Share Posted July 16, 2021 Having the same problem with a newly rebuilt gearbox by a very (probably most experienced) Series restorer. I don't have the rubber boot attached so that isnt it. It happens when the gearbox is in third and under a load but it doesn't pop out of 3rd like with bad synchro's it pops out of high range. Can I check the detent ball for the Tbox without too much dissembling? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.