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Which main shaft would you use?
Posted by: macutak ()
Date: September 05, 2015 10:52AM

I ordered a used mainshaft to rebuild my transmission. I received the one pictured below on the left which is trashed. Clarks apologized and overnighted the one below. I think mine still looks the besT. What do you think? I know it's hard to tell from pictures. My transmission guy says that there are some light scoring marks on mine from the needle bearings. I'm not sure where the needle bearings ride but wherever it is, the one below doesn't look much better. I think it looks worse.

We are putting it together on Monday and installing the entire drive train for a car show next Saturday. The Brigham Bity Peach Days free car show is one of the largest in the Mountain West. I'm hoping to Enter it as a "unsafe at any speed" anniversary entry.



I'm almost done. I just need...


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Re: Which main shaft would you use?
Posted by: Wagon Master ()
Date: September 05, 2015 12:51PM

The needle bearings ride on the 2 shiny surfaces on the left hand side of the picture.

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Re: Which main shaft would you use?
Posted by: vairmech ()
Date: September 06, 2015 09:39AM

On this particular model there is a thrust bearing that has little roller needles in it then you also have the clutch gear that has the dowble roller needles in it as mentioned.

I may have an NOS shaft and I'm also pretty sure I have an excellent used main shaft if you still need one.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Which main shaft would you use?
Posted by: caroseiii ()
Date: October 09, 2017 08:38PM

I noted that two shafts are different as well. The shaft on the left is a 61 and the one on the right is 62-63. The difference is a tiny ridge cut between the clip for the 3-4 synchronizer and the needle bearing shoulder.
See this photo for a closer look. 1961 has the worn needle land on the bottom.
Crawford



Edited 1 time(s). Last edit at 10/09/2017 08:40PM by caroseiii.

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Re: Which main shaft would you use?
Posted by: cnicol ()
Date: October 09, 2017 10:00PM

I have a NOS mainshaft for some kind of Corvair transmission. Let me find out what it is and report back tomorrow.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Which main shaft would you use?
Posted by: vairmech ()
Date: October 10, 2017 06:18AM

Did you guys look at the date on this?????

It is from 2 years ago!

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Which main shaft would you use?
Posted by: cnicol ()
Date: October 10, 2017 06:56AM

vairmech Wrote:
-------------------------------------------------------
> Did you guys look at the date on this?????
>
> It is from 2 years ago!

Doh! Missed that. Thanks for the tip.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Which main shaft Needle Bearing would you use?
Posted by: caroseiii ()
Date: October 23, 2017 05:15PM

FYI: On 1961 mainshafts only, the original 1/2" needle bearing GM 9415150 has been discontinued for a long time. I found a replacement which is a little better than the Clarks 62-69 replacement needle bearing which is shorter (15/32"). Use Mercury 29-39656 Outboard Motor connecting rod needle bearings. I bought some on eBay and the fit is good and these have correct ends.
Crawford Rose

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