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Thread: LT95 Jumping out of gear and high range

  1. #1
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    LT95 Jumping out of gear and high range

    I've got a couple of niggling issues with the gearbox in my County that are steadily getting more frequent.

    Firstly, its occasionally jumping out of third gear on overrun which is a bit annoying but no major drama. Is this likely to simply be wear on the dog teeth, and therefore unfixable without stripping the box and replacing the worn bits?

    The more serious issue is that often after changing from low to high range, its jumping out of high. Often its violent enough to jump straight from high back into low (which definitely makes you take notice ).
    It only ever happens immediately after changing to high range, and if its going to jump out will do so on the first or second throttle application after changing. If it doesn't jump out by then, its in for good and wont jump out at all.
    Its got a tapered roller intermediate shaft in it so wont be an issue with worn thrust washers etc.
    Again, is this most likely to simply be wear on the dog teeth or are there other possibilities?

    Steve

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    3rd gear is most likely what you mentioned, but also check for broken detent springs etc and worse case excessive mainshaft float. The TF case is most likely the adjustment of the engagement forks if they have too much gap where they contact the slector ring they won't allow a positive engagement, also try holding the high range lever in while you drive off at first, this usually cures the symptom of jumping out. The best thing to do is to drop the bottom cover off and measure the clearance at the selector fork to selector ring, IIRC should be about .25mm or similar? Not near my manual, Brian may be able to remember

    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈

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    Quote Originally Posted by justinc View Post
    3rd gear is most likely what you mentioned, but also check for broken detent springs etc and worse case excessive mainshaft float. The TF case is most likely the adjustment of the engagement forks if they have too much gap where they contact the slector ring they won't allow a positive engagement, also try holding the high range lever in while you drive off at first, this usually cures the symptom of jumping out. The best thing to do is to drop the bottom cover off and measure the clearance at the selector fork to selector ring, IIRC should be about .25mm or similar? Not near my manual, Brian may be able to remember

    JC
    Thanks JC.

    Would broken detent springs be obvious from the feel of the gear lever, or do I need to actually look at them?

    Holding the high range lever in while taking off doesn't stop it jumping out if its going to, but it does prevent it going straight through to low range.
    Will check the engagement fork clearance - hopefully its just a simple adjustment issue.

    Steve

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    Mine jumps out of high similarly to yours but only occasionally. I found if the vehicle is still rolling when changing it engages properly every time.

  5. #5
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    Quote Originally Posted by isuzutoo-eh View Post
    Mine jumps out of high similarly to yours but only occasionally. I found if the vehicle is still rolling when changing it engages properly every time.
    Thanks - I've been changing while stopped, so will try it rolling and see how it goes.

    Steve

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    Steve, One thing to try before you get serious with 3rd gear is to remove the rubber boot on the transmission hump and make sure the gear lever is not fouling on the foam insulation block on the top of the box when 3rd is engaged. I have seen a few with this problem and it has turned out to be just the foam getting fouled on the gear lever and applying slight pressure and it jumps out when you back off, easily fixed by hacking a bit out of the foam, otherwise as JC said possibly endfloat. The transfer problem could be selector adjustment (correct JC) .25mm between rear selector and rear face of input gear when in neutral. Also check wear on engaging dogs on high range gear. If any teeth are tapered this will happen.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  7. #7
    tim_m Guest

    isuzutoo-eh occasional jumping out of gear

    isuzutoo-eh
    Mine used to jump out very rarely and only when the gearstick was being bounced about by the driving manor/ road. At this time the stick was very free to move. Replacing the foam that is just about the ball of the stick damped its movemnet and stopped this.ie As you come down the main gear lever there is a plate(576317) held by three bolts them soft washer (foam )(622387) them the sphere the the gear lever piviot on. Tim_m

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    OK - dredging up my own ancient thread as the jumping out of high range has got worse - and my wife has had enough of the swearing

    Been a long time since I've been inside the LT95, so just wanted to confirm whether I can check/fix both the selector adjustment and high range dog wear just by removing the bottom cover plate, or if it needs the transfer top cover removed.
    If it needs the top cover off I'll bit the bullet and drop whole thing out and fix a few other niggles/leaks while I'm at it.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

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    Quote Originally Posted by steveG View Post
    OK - dredging up my own ancient thread as the jumping out of high range has got worse - and my wife has had enough of the swearing

    Been a long time since I've been inside the LT95, so just wanted to confirm whether I can check/fix both the selector adjustment and high range dog wear just by removing the bottom cover plate, or if it needs the transfer top cover removed.
    If it needs the top cover off I'll bit the bullet and drop whole thing out and fix a few other niggles/leaks while I'm at it.

    Steve
    Steve you can inspect the hi range gear dogs by dropping the sump plate but to adjust the selector forks you need to remove the top cover.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  10. #10
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    Thanks Brian. I'll drop the cover and have a look first but sounds like it will be coming out either way as I'm guessing replacement gears will probably need the selectors adjusted.
    If I do need to source new gears I'll do it before pulling the box so I can hopefully get it out, fixed, and back in over a couple of weekends.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

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