Woody Woodruff wrote:with the double nut, that will keep it from backing off right? splined or not? I know that when Brian rebuilt mine, he double nutted it, but I can't for the life of me remember if I got a splined gear or not. Should it matter at that point?
Woody,
The 5th gear coming apart (Splined or welded Gear fixes this problem) and the nut coming loose are two different problems.
5th gear is made up of two parts...early gears were furance brazed and later gears were splined.
Last edited by fj20spl311 on Sun Feb 08, 2009 1:21 pm, edited 1 time in total.
Phil
67.5 SRL311-00148 Blue (FJ cruiser VOODOO Blue)
67.5 SPL311 FJ20E teal SDS EFI
69 SRL311 SOLD
19 Raptor SCAB
Ok let assume I got lucky nothing was broken when I lost the 5th and reverse gear, now let say I removed the transmission off the car and removed the rear housing, looking at my tranny same position as the pictures you provided, in other words I’m looking at my tranny the same position as your pictures, I hope that make sense. Anyway since there issue with my tranny, the only difference from your pictures to my tranny is the nut is loosening, back off, right? And just by tighten this nut will fixed the problem? Do I expect to see whole bunch of gears, bearings lying around when the rear housing removed?
In theory, yes you should be able to tighten the single or double mainshaft bolts and be good to go. There shouldn't be any gears or bearings floating around, you would know it if there were.
One of these days I should go pull my dead transmission apart and see what it really needs. If nothing else document it and post it so people can look and see what one should or shouldn't look like.
Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!
Vinh,
You should not see any loose parts inside the rear housing. Until you get that portion apart, the exact cause is still unknown. With out "driving" your car it's had to diagnose the problem without pictures......
I was looking at Mike's pictures and remembered an additional possible problem I have encountered on a Capri I once had. It could be the roll pin or bolt (can't remember which they use on the datsun) that locates the 5th - reverse gear shift fork. This still would be a very easy repair.
Get the engine and trans out of the car (you don't need to unbolt the trans off the engine unless it's easier). block up the engine and trans and remove the rear housing. Before you disconnect the shift leaver, put the trans in neutral. The striking rod should rotate easily. As you remove the housing rotate and push in the striking rod - it should not bind - rotate it.
Take lots of pictures of each side.
Last edited by fj20spl311 on Mon Feb 09, 2009 2:05 am, edited 1 time in total.
Phil
67.5 SRL311-00148 Blue (FJ cruiser VOODOO Blue)
67.5 SPL311 FJ20E teal SDS EFI
69 SRL311 SOLD
19 Raptor SCAB
Get the engine and trans out of the car (you don't need to unbolt the trans off the engine unless it's easier). block up the engine and trans and remove the rear housing. Before you disconnect the shift leaver, put the trans in neutral. The striking rod should rotate easily. As you remove the housing rotate and push in the striking rod - it should not bind - rotate it.
Now there is some good advice, I would have offered that as well, but I know better.
I don't think it's the double nut loosening. If you look at Mike Hudson's second picture, the bottom rear gear has to be removes to slip off the upper gear on the main shaft. I can see 5th slipping if the nuts came loose but I think reverse would still work. I think it is a broken roll pin or fork.
the bottom rear gear has to be removes to slip off the upper gear on the main shaft. I can see 5th slipping if the nuts came loose but I think reverse would still work. I think it is a broken roll pin or fork.
When I looked at that picture, I thought the same thing for the same reason, I'm probably not smarter than a 5th grader, but hopefully, the average roadster gear-head. I vote the same, a shift fork problem.
What's the last thing you did before you had this problem? A hard shift somewhere?
Mike,
I didn’t do anything different on that day, I drove the car as I normally did with my other roadster.
On second thought I might have drove a little too hard going against 1st gen Mazda RX7 but thats it and ran fine.
On the way home going about 85mph on 5th gear, still in 5th gear all of a sudden it went neutral, the RPM just rev like it in neutral. I don’t want to be stranded the freeway so I kept going heading home, that is about 6miles from home. Got home reverse the car in garage, no reverse at the same time I felt a little grinding. I hope I didn’t screw up any gears, they are pricy.
In that case, it doesn't seem to be a shifter fork failing while in a "static" (non-moving) mode. That seems like a slipping 5th gear component or the locknut failure syndrome. I haven't had one fail, so I won't guess any further.
We can guess all we want, but that is useless until the transmission comes out. There is no issues with these symptoms that can be fixed with the tranny in the car. Pull it out, have a look, post photos, etc. then we can have an educated answer instead of guessing. Don't buy any parts or another transmission without knowing the real problem.
datsun1500 wrote:We can guess all we want, but that is useless until the transmission comes out. There is no issues with these symptoms that can be fixed with the tranny in the car. Pull it out, have a look, post photos, etc. then we can have an educated answer instead of guessing. Don't buy any parts or another transmission without knowing the real problem.
Mark
Psshhh. What would a 1500 dork know anyway Mark? ROFLAMO!! Just kidding! Sage words there. Diagnosing without investigating is urinating into the wind...
To be fair, in my opinion, Vinh did basicially imply his budget only allowed guessing and DIY repair at this point and limited capability to pull the components. That's a bad combination for anyone participating in a "vintage automobile ownership" type hobby. You get what you pay for, right? Knowledge costs, by toil or monetary sacrifice.
The answer is blowing [sic] in the wind". It usually is, I like it!
23yrRebuild wrote:To be fair, in my opinion, Vinh did basicially imply his budget only allowed guessing and DIY repair at this point and limited capability to pull the components.
From what I read he says he can pull the drivetrain, but in his 2nd post he is asking to buy a transmission. On a limited budget, buying a transmission without knowing the problem is foolish. This could be a $5 fix or a $500 fix. Guessing is OK but educated guessing might solve the problem.
Hi all,
I appreciate all inputs, budget or no budget. the inputs you guys gave me I feel more confidence than ever. I was going to neither buy or have someone rebuild it for me but now with inputs you guys gave me I will at least try.
Absolutely pictures to death with this, before and after…..I plan to remove the whole drive train in about two to three weeks, no time yet. I promise pictures, before and after shots. I will need you guys help on this one to walk me through sort of like guiding a blind man crossing the street.
