1960 - Transmission yoke shaft exposure

[Daniel S.]

Hi,

I just installed the driveshaft in my 1960 after having my Borg Warner rebuilt. The actual yoke shaft exposure is 2 inches showing - is that correct. I have the 4 and 3/4 inch yoke which is supposed to be correct. Also does anyone have the drive shaft length - I bought this car in pieces - no engine or transmission and was wondering if it is the right driveshaft?.

Thanks

Dan

[Kent S.]

Re: 1960 - Transmission yoke shaft exposure

Are the rear wheels on the ground (or ramps) rather than hanging? I've always thought 3/4" was the correct "exposure" but others may have a different opinion.

[Joe L.]

Re: 1960 - Transmission yoke shaft exposure

Hi,

I just installed the driveshaft in my 1960 after having my Borg Warner rebuilt. The actual yoke shaft exposure is 2 inches showing - is that correct. I have the 4 and 3/4 inch yoke which is supposed to be correct. Also does anyone have the drive shaft length - I bought this car in pieces - no engine or transmission and was wondering if it is the right driveshaft?.



Thanks

Dan

Daniel------


Driveshaft length was 34-35/64" end-to-end.

[Daniel S.]

Re: 1960 - Transmission yoke shaft exposure

Thanks Joe I will measure the drive shaft tomorrow .

[Daniel S.]

Re: 1960 - Transmission yoke shaft exposure

HI Kent,

I have the car up on blocks but simulating like it would be on wheels. I will measure the driveshaft per Joe's measurements.

[Daniel S.]

Re: 1960 - Transmission yoke shaft exposure

Hi Joe,

I assume that when you say end to end it is from center of u joint to center of u joint which it looks like is the correct length.

Thank you

[Joe L.]

Re: 1960 - Transmission yoke shaft exposure

Hi Joe,

I assume that when you say end to end it is from center of u joint to center of u joint which it looks like is the correct length.

Thank you

Daniel-------


Well, according to GM it's end-to-end. However, I have found in the past that when they say end-to-end they actually mean center-to-center.

[Joe R.]

Re: 1960 - Transmission yoke shaft exposure

Hi,

I just installed the driveshaft in my 1960 after having my Borg Warner rebuilt. The actual yoke shaft exposure is 2 inches showing - is that correct. I have the 4 and 3/4 inch yoke which is supposed to be correct. Also does anyone have the drive shaft length - I bought this car in pieces - no engine or transmission and was wondering if it is the right driveshaft?.

Thanks

Dan

Last year I did some internet research on this topic (recommended amount of yoke shaft free play), and the consensus was that 3/4" to 1" is recommended for solid axle cars where movement of the rear suspension causes the yoke to move in and out of the transmission.

Note that the key factor is free play, the distance that the yoke has available to move in and out. This is not the same as yoke exposure, because the maximum travel distance of the yoke into the transmission might be limited by the length of the transmission output shaft rather than the yoke itself.

Even if your yoke has 2" of free play, I don't think that's a disaster. You can still drive the car that way, even if it is not optimal. Take your time to figure out whether your driveshaft is the stock length.

[David B.]

Re: 1960 - Transmission yoke shaft exposure

The correct yolk for all 55-62 Corv. (8 cyl) is PN 3712379 Grp. 5.555. It measures 6.17 from end to center opening. The finished surface is 4.93 long. As previously mentioned the driveshaft is 34 35/64 long. It is a type F. Parts books show it measured from end to end.

[Daniel S.]

Re: 1960 - Transmission yoke shaft exposure

Last year I did some internet research on this topic (recommended amount of yoke shaft free play), and the consensus was that 3/4" to 1" is recommended for solid axle cars where movement of the rear suspension causes the yoke to move in and out of the transmission.

Note that the key factor is free play, the distance that the yoke has available to move in and out. This is not the same as yoke exposure, because the maximum travel distance of the yoke into the transmission might be limited by the length of the transmission output shaft rather than the yoke itself.

Even if your yoke has 2" of free play, I don't think that's a disaster. You can still drive the car that way, even if it is not optimal. Take your time to figure out whether your driveshaft is the stock length.

Hi Joe,
I measured the drive shaft and apparently it is the right length - I went and measured the free play again and it is about 1 3/4 inch . I am with you that it should be ok I should have at least minimum of 2 inches where the yoke overlaps the transmission shaft.

thanks for the info.

Dan