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Old 07-10-2019, 10:39 PM   #1
rickbr
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Default Trans issue

Not bashing any one just asking for guidance. I just bought a PG from Coan went to install it, my drive shaft wouldn't slide all the way in, lacking about an inch and a half from sliding to the end of the tail shaft. I can't get enough clearance to put the drive shaft in. The drive shaft is from PST so it's not a POS, fit the Coan th350 that I took out, slides all the way to the end of the tail shaft.
I took the tail shaft housing off found a small burr took a triangle file and smoothed it out. Took the file to all the splines no other burr found. Still my driveshaft wont slide all the way in.
Talked to Coan they want me to send it back to them on my dime of course.(175 each way) So I would have paid shipping 3 ways.
Is there any thing else I am over looking? Any one ever run into this before?
Thanks
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Old 07-10-2019, 11:08 PM   #2
Hutch
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Default Re: Trans issue

If there is spline on the output shaft that the yoke is getting stuck on, have a closer look for a burr somewhere.


Do you have any other yokes to try?


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Old 07-11-2019, 12:57 AM   #3
keith42
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Default Re: Trans issue

A friend of mine had a similar problem, the trans shop sent him a new yoke to try and it fixed the problem.
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Old 07-11-2019, 08:59 AM   #4
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Default Re: Trans issue

Look inside the yoke, I found a plastic plug in one once. I would try another trans for fit,
and also try a diff yoke, so you can eliminate one or the other.
Make sure there's no twist on the output shaft, doesn't take much.
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Old 07-11-2019, 09:46 AM   #5
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Default Re: Trans issue

Who yoke do you have?
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Old 07-11-2019, 11:03 PM   #6
rickbr
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Default Re: Trans issue

I have the one that came from PST. I don't have another. I could get one from a junk yard but I don't think that it would help seeing if a 100k mile used stock one would fit. I have checked inside the yoke there is nothing wrong I could see and it fits the Coan TH350 slides all the way in to the seal. I will call and see if I can work out a deal with Coan to get one of their yokes to see if it fits.
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Old 07-11-2019, 11:13 PM   #7
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Default Re: Trans issue

So it slides on with no tailhousing until the yoke hits the output shaft tip or runs into spline interference?


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Old 07-12-2019, 12:19 PM   #8
rickbr
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Default Re: Trans issue

No, I took the tail shaft housing off, it still would not slide all the way, it does on the th350. I bought a new yoke from Coan, if it don't fit, they will refund me when I ship the trans back.
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Old 07-12-2019, 01:06 PM   #9
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Default Re: Trans issue

Not sure where you live, i have an old 350 yoke you could have, but looks like you
got that covered.
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Old 07-13-2019, 02:42 PM   #10
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Default

I suspect the splines on the new output shaft were not cut long enough. I had to counterbore a yoke once on a glide from Coan with their 1.80 planetary gears.
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Old 08-08-2019, 08:42 AM   #11
rickbr
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Default Re: Trans issue

Coan stood behind their product and fixed the issue (some thing wrong with the splines)on their dime. Thanks Walker for taking care of the issue, they paid for shipping there and back. Makes you happy knowing a company will stand behind there products.
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Old 08-09-2019, 08:46 PM   #12
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Default Re: Trans issue

Quote:
Originally Posted by rickbr View Post
Coan stood behind their product and fixed the issue (some thing wrong with the splines)on their dime. Thanks Walker for taking care of the issue, they paid for shipping there and back. Makes you happy knowing a company will stand behind there products.
My post sounded negative, but in Coan's defense, I did not give them a chance to correct anything. I just handled it.

My experience with Coan's transmission and converters was nothing less than excellent. They totally steered me in the right direction. Major improvement in my game!
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