MikeZcar Posted January 22, 2006 Share #1 Posted January 22, 2006 78 Z, stock, may have later model tranny installed. It jumps out of 1st and 5th gear, does this sound like an easy fix? ie something is just loose like a nut on the end of a shaft? Thoughts? Link to comment Share on other sites More sharing options...
ecp48 Posted January 22, 2006 Share #2 Posted January 22, 2006 More than likely it has bad synchros and possibly worn gears.Only easy if you know tranny repairs. Link to comment Share on other sites More sharing options...
Zs-ondabrain Posted January 22, 2006 Share #3 Posted January 22, 2006 My Z is a 70' but it has a later model tranni in it. After I put it in, it would also jump out of 1st and 5th until............. I trimmed the sheet metal where the shifter comes through and I'm still able to use the stock boot.Usually your rubber boot wiggles it out of gear. Most likely an easy fix.Also check you shifter bushings for wear. Excess vibration from worn bushings can also cause it to "jump out of gear"JM2C,Dave. Link to comment Share on other sites More sharing options...
george71z Posted January 24, 2006 Share #4 Posted January 24, 2006 The tranny in my 71 only jumps out of second; and only when I am decelerating. I had rebuilt it awhile back for a destroyed countershaft bearing. There was no visible damage to anything else, and it was free of any debris internally. Any ideas? I have another tranny that just needs some seals and gaskets, so I will be getting that one ready and doing a swap soon. Then I will dismantle the 'jumper' and see whats up. Link to comment Share on other sites More sharing options...
nateroszhart Posted June 9, 2006 Share #5 Posted June 9, 2006 i have the same problem! jumps out of second...really annoying me. Link to comment Share on other sites More sharing options...
ezzzzzzz Posted June 9, 2006 Share #6 Posted June 9, 2006 I don't have shop manual here at work and haven't dived into a datsun tranny yet. This is based on past experience when working on other manual boxes. There is usually a spring and detent ball for each shift rail. These keep the tranny in the selected gear as well as preventing another unused gear from accidentally vibrating into engagement. You might look into replacing these simple items assuming that the tranny shifts properly otherwise. Link to comment Share on other sites More sharing options...
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