Driveshaft spinning in neutral

[sedition88]

So we put a 5 speed dogleg into Greengoon's '72 510 wagon and now (as the title indicates) the driveshaft just spins in neutral. What could possibly make this happen? Any insight would be great, thanks!

[Guest 510kamikazifreak]

[wayno]

So we put a 5 speed dogleg into Greengoon's '72 510 wagon and now (as the title indicates) the driveshaft just spins in neutral. What could possibly make this happen? Any insight would be great, thanks!

 

Was the tranny changed because you thought it was blown up, but it turns out the rearend was blown up instead?

[datzenmike]

Wa ha-ha-ha-ha . A blown side or pinion mate gear or broken axle would fit the symptoms.

[Guest 510kamikazifreak]

Wa ha-ha-ha-ha . A blown side or pinion mate gear or broken axle would fit the symptoms.

 

hence the baby giving funny look :hyper:

[sedition88]

The 4 speed worked fine, but he wanted the 5 speed. So we'll have to check a few things to get this fixed

[BRE510]

_{Sedition88 - I spoke to Greengone about this and told him it is not uncommon for the drivshaft to spin slowly in neutral with the drive wheels off the ground. As long as you can stop it from spinning (again, it should only spin slowly) by either stopping it with your hands grabbing the wheel or lightly jam the rear wheels from spinning and it should stop with no effect on the engine idle. Hope this helps.}

[wayno]

So the back wheels were off the ground?

[DanielC]

All the gears inside a transmission, except reverse, are in mesh. They are always turning. They are on bearings, so no real power is transmitted. Additionally, the synchroniser rings are also very close to the gears they engage, and thay will tend to be drug in the direction the always turning gear is spinning.

 

If the rear axle on the car is off the ground. and can spin freely, I would expect the drive shaft of the car to turn, and one or both wheels.

[sedition88]

That would make sence now that you guys mention it. I never said that the car was off the ground, one I forgot it was, and two I may have thought he had put it back down. Oh well lol I'm sure it's fine. Thanks guys!

[Briansdime]

I have the same issue but when I hit the brakes and the wheels stop spinning the engine bogs down like its under a load. When clutch is pushed in the wheels stop sining. Tryed putting it in gear and no grinding fwd or rev. The guy I bought it off of said its a L series bellhousing with a nap z shorty gear box so not sure what that means but any advise will help.

[datzenmike]

I have the same issue but when I hit the brakes and the wheels stop spinning the engine bogs down like its under a load. When clutch is pushed in the wheels stop sining. Tryed putting it in gear and no grinding fwd or rev. The guy I bought it off of said its a L series bellhousing with a nap z shorty gear box so not sure what that means but any advise will help.

 

You don't say but do you mean it's in neutral? I've seen this at 20 below when the trans oil is thick as grease. It will transmit some turning movement. This can't happen at a reasonable temperature, the oil is much too thin, so something it dragging inside.

1/ A synchro ring is like a small clutch between two moving parts. Possibly it rubbing (but not for long) the samee as if you were to force the shifter towards a gear with the clutch out.

2/ There is a separation between the input shaft and the mainshaft . Shifting to 4th bridges this break but there are bearings that could be seized/seizing that could be transmitting power through friction.

 

 

There would be no turning of the transmission insides with the clutch disconnecting the engine so spinning driveshaft would stop and no grinding into reverse.

[Briansdime]

Yea I was told to block a wheel and try spinning the other if it takes a lot of effort the it's something internal. I tried this and yea it takes a good amount of effort. I was also told I used to thick of oil witch was 75w90 so not sure oil would cause that. Would using a L series slave cylinder with a non adjustable shaft cause this?

[datzenmike]

Not in neutral. The counter shaft would be spun by the engine but there should be no connection with the mainshaft through any of the gears or bearings.