C6 yoke installation questions

Clutch, transmission, rear axle

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radiorusty1096
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C6 yoke installation questions

Postby radiorusty1096 » Tue Aug 01, 2017 7:56 pm

Hello,
Re my 1970 F250 C6 transmission installation: I have some questions:

1) My newly rebuilt transmission came back with a different output shaft. The new shaft carries all the same dimensions but has no provision for the cotter pin to safety the yoke nut, as the former shaft did. Is it OK to torque the nut on and put the truck back in service without a cotter pin safety on this nut? The Ford manual calls for 380 to 470 foot pounds on this 1 & 1/2" nut. Does this sound right?

2) The spacer between the aft (7065) transmission bearing and the speedometer drive gear is also missing. (I think the spacer part number is 17288.) Without this spacer, the speedometer drive gear does not center over the speedometer driven gear and the yoke goes on the shaft too far. This causes the yoke nut to shoulder out before it actually contacts the yoke. Any idea where I can find a 17288 spacer? And will the spacer alone get me lined up or will I need to shim it up? If so, where can I find the shims?

3) When flushing the radiator/trans fluid cooler and lines I noted very free flow in the correct (aft output, forward return) flow direction, but no flow whatsoever in the opposite direction. Is there a check valve somewhere (darned if I could find one) or is something else going on?

Thanks for your help!
Russ

N420GAand F250082016.jpg
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basketcase0302
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Re: C6 yoke installation questions

Postby basketcase0302 » Tue Aug 22, 2017 7:41 pm

"radiorusty1096"]Hello,
Re my 1970 F250 C6 transmission installation: I have some questions:

1) My newly rebuilt transmission came back with a different output shaft. The new shaft carries all the same dimensions but has no provision for the cotter pin to safety the yoke nut, as the former shaft did. Is it OK to torque the nut on and put the truck back in service without a cotter pin safety on this nut? The Ford manual calls for 380 to 470 foot pounds on this 1 & 1/2" nut. Does this sound right?

2) The spacer between the aft (7065) transmission bearing and the speedometer drive gear is also missing. (I think the spacer part number is 17288.) Without this spacer, the speedometer drive gear does not center over the speedometer driven gear and the yoke goes on the shaft too far. This causes the yoke nut to shoulder out before it actually contacts the yoke. Any idea where I can find a 17288 spacer? And will the spacer alone get me lined up or will I need to shim it up? If so, where can I find the shims?

3) When flushing the radiator/trans fluid cooler and lines I noted very free flow in the correct (aft output, forward return) flow direction, but no flow whatsoever in the opposite direction. Is there a check valve somewhere (darned if I could find one) or is something else going on?

Thanks for your help!
Russ

N420GAand F250082016.jpg


Well I had to look at the file pic as I couldn't remember on the tailshaft, (didn't remember mine having a cotter pin). But it does show one so maybe someone else will chime in here too. Try Green Sales for the spacer and then Obsolete Ford Parts as those two specialize in hard to find parts like that. And I'm gonna go out on a lim here about the tranny lines and say your correct about the check valve. I do remember pulling the valve body on a C-4 years ago and the check valve was a ball bearing in the valve cavity. Maybe someone else will chime in on that one too, sorry I couldn't help more.
Nice truck BTW too. :thup:
http://www.greensalescompany.com/

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Jeff
viewtopic.php?f=22&t=46251
SOLD-71 F-350 dually flatbed, 302 / .030 over V-8 with a "baby"C-6, B & M truckshifter, Dana70/4.11 ratio, intermittent wipers, tilt steering, full LED lighting on the flat bed, and no stereo yet (this way I can hear the rattles to diagnose)! SOLD!
A lot of "oddball" Ford parts collected from working on them for 34 years now!
2008 Ford Escape 4 x 4

I'm "on the fence" about another bump right now / still looking at them / but not real sure if I'm ready for it or not (until I get moved). :(


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