3053 Main Shaft help

[DaneGer21]

While reinstalling the gear set onto my main shaft I noticed I do NOT have a key way for the 2nd gear, mine only presses on.

Moving to the next step is when I encounter a key way for the synchro sleeve.

Can anyone help? @m-35tom

Also, since I pressed on the 2nd gear with no alignment, it does not match up with my synchro teeth. And since 2nd is pressed on, nothing told me how to do it.

 

[m-35tom]

second gear does not press on. it is a bearing fit on that section of the shaft. sounds like your mainshaft is destroyed

 

[DaneGer21]

second gear does not press on. it is a bearing fit on that section of the shaft. sounds like your mainshaft is destroyed

It’s a brand new main shaft

So 2nd gear should spin freely on the main shaft? Or be snug?

 

[m-35tom]

second gear slides on the shaft, then put in 2 keys and press hub on, then snap ring, then 2/3 syncro, then 3d gear. make sure 2/3 syncro is facing correct way or it will not shift. both gears spin freely on shaft.

 

[DaneGer21]

Yeah my 2nd gear wouldn’t slip on…hmmm

Everything else sounds correct.

 

[m-35tom]

many NOS parts are surplus because of defects. both gears run on shaft and spin freely.

 

[DaneGer21]

Well shoot. Now I gotta take it all apart haha

 

[DaneGer21]

Here is the original main shaft that came out. You can see it was awful tight and material had been “moved” in order for it to spin. You can even see some discoloration from the heat

 

[m-35tom]

that is from driving to fast. really. the 2nd gear that was on there would definitely not be reusable.

 

[DaneGer21]

that is from driving to fast. really. the 2nd gear that was on there would definitely not be reusable.

Who knows, it came pretty much trashed when I got it.

Stupid question, but can’t you only go so fast in 2nd gear? lol Unless I’m miss understanding what you are saying. I mean, if it’s made to spin on that shaft, and the gear is tight, wouldn’t this cause the same thing from the tight fit forcing itself to spin? Just curious.

A new gear was ordered.

 

[m-35tom]

the problem occurs when going to fast in 5th, the shaft is spinning far faster than the 2nd gear and overheats.

 

[DaneGer21]

the problem occurs when going to fast in 5th, the shaft is spinning far faster than the 2nd gear and overheats.

Now that makes sense, thanks!

 

[G744]

Would full synthetic gear lube help prevent that problem?

DG

 

[brianp454]

Now that makes sense, thanks!

I do not buy this explanation. I just pulled a transmission apart that I've been running for 10 years with much of the time in OD and the area under 2nd gear looked spotless. I think something else was an issue, such as it got ran low on oil, never got a change when it should have, etc. I think it is much more likely that you got a piece of crud (from normal gear or abnormal wear) in there that started a bad chain reaction that led to your issue. It could have had some manufacturing defect such as being too tight or too loose and that lead this this. Running in OD does not cause other gears to fail unless there is another issue.

 

[DaneGer21]

I do not buy this explanation. I just pulled a transmission apart that I've been running for 10 years with much of the time in OD and the area under 2nd gear looked spotless. I think something else was an issue, such as it got ran low on oil, never got a change when it should have, etc. I think it is much more likely that you got a piece of crud (from normal gear or abnormal wear) in there that started a bad chain reaction that led to your issue. It could have had some manufacturing defect such as being too tight or too loose and that lead this this. Running in OD does not cause other gears to fail unless there is another issue.

They are all different. I believe the transmission professional above who deals with these all day everyday