I have a 5speed d/r part time 4wd in my car. When I'm going down a hill at 5-10 mph engine braking in first gear, it jumps out of gear.

This may seem like a rare thing to do, but I do it every day going up and down my driveway, so it's quite noticeable.

 

Is this a linkage problem, or is the tranny pooched?

I doubt it is the linkage. This is usually an indication of the sychro going out. Can you duplicate it anywhere else besides your driveway?

I doubt it is the linkage. This is usually an indication of the sychro going out. Can you duplicate it anywhere else besides your driveway?

 

I haven't tried, but my driveway is a very steep bump dirt road. So being bumped around probably does it.

I wouldn't think a bad synchro would do that, the 1st gear syncho is actually tons better than the old tranny. And that one never jumped gear.

I was fearing it was the dog engagement gears...

Contrary to belief, The synchro assembly is also responsible for holding the gear. When you shift, the synchro pushes against a bronze/brass cone shaped ring called a blocking ring. This ring is riding on the side of the gear you are shifting into. It slows it down allowing the chamfered teeth on the synchro sleeve to engage that gear without grinding. The synchro sleeve rides on the synchro hub which has 3 or 4 spring loaded detent pawls(feet) that are notched parallel to the inside of the ring that keep the synchro ring from sliding/jumping out of gear. If those go bad (springs, pawls or notching on the ring) then it pops out of gear. This may not be your situation, but a lot of people misunderstand the full function of the synchro.

Bungy cord to hold the shift lever and gear in place? I have seen this used, on a beater Ford bush beast.

^ We did that on my friend's 4speed truck.

It's not a huge deal, I only use first gear getting moving from a stop and engine braking down my driveway, just wanted to know what's up.

 

Contrary to belief, The synchro assembly is also responsible for holding the gear. When you shift, the synchro pushes against a bronze/brass cone shaped ring called a blocking ring. This ring is riding on the side of the gear you are shifting into. It slows it down allowing the chamfered teeth on the synchro sleeve to engage that gear without grinding. The synchro sleeve rides on the synchro hub which has 3 or 4 spring loaded detent pawls(feet) that are notched parallel to the inside of the ring that keep the synchro ring from sliding/jumping out of gear. If those go bad (springs, pawls or notching on the ring) then it pops out of gear. This may not be your situation, but a lot of people misunderstand the full function of the synchro.

Thanks for the clarification on that! That's awesome to know how it works better.

It's weird, on the old transmission the first gear syncho didn't work at all. It was like trying to shift into reverse while moving at all. It was seriously grindy unless I double clutched it. I'm still in that habit, but I just figured this one was better. Huh. At least it doesn't make crunchy bad input shaft bearing noises...

Not that it's any help, but I have had at least 3 of my older 5 spd dual ranges do that. Like you said, it wasn't big deal, so I just never worried about it. But it would be good to know the definite cause of it.

Ya, it doesn't bother me so much, it doesn't even happen every time.

Just curious as to what causes it. This transmission is leaps and bounds better than the last one. That was a serious nightmare shifting when cold in the winter, and the bad bearing noises just made me cringe all the time...

Haha, and yet it kept going!

Haha, and yet it kept going!

 

I drove it to NC and back like that, and it didn't really get any worse.

The noise just really annoyed me, I can't stand things screaming a slow mechanical death. It's just painful...

I have a 5speed d/r part time 4wd in my car. When I'm going down a hill at 5-10 mph engine braking in first gear, it jumps out of gear.

This may seem like a rare thing to do, but I do it every day going up and down my driveway, so it's quite noticeable.

 

Is this a linkage problem, or is the tranny pooched?

 

 

locate the cover nuts on side of gearbox under which you find the gear selector rod springs, remove springs and stretch with a pliers, this will put more pressure on the ball bearing thats locks the selector rod, usually 3 springs under 3 nuts

My d/r pops out of gear too. I don't remember which one though...and I haven't driven it in awhile.

Think it was 3rd..