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Old 03-21-2004, 01:38 PM
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wrong driveshaft length?

Hi guys,

It seems that my hotrod car project can never end. I bought and installed myself a 10 bolt 8.5" 3.73 posi rear-end that came out of Nova on my 67 Camaro. I swapped a non-posi 3.08 10 bolt 8.2". Purches, aligning bumps on springs - everything went okay until I tried installing my old driveshaft.

Before the swap I could easily remove the driveshaft out of the TH350 transmission. Now I had to actually angle the rear pinion upward to allow the driveshaft yoke to go in. That was the only way to do it. Once lowered, the end play was about 1/4" or less. I did some digging on this site and general agreement is 1/2-1" end play.

Should I take the car to a driveshaft shop and have it shortened by 0.5" or more? My new rear transmission seal is leaking tranny fluid once the car is jacked up in the front. Did I damage the transmission shaft?

Thanks in advance,
Denis
'67 Camaro RS

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Old 03-21-2004, 02:25 PM
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I say get it cut, I know it seems like a lot of hassle to go through for just a half inch difference, but if you don't it'll probably lead to other headaches down the road.

As far as the rear seal, check it out and make sure than in all the shuffling that it didn't get damaged. As cheap and easy as they are, I'd just slap in a new one when I put the driveshaft back in.
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Old 03-21-2004, 03:59 PM
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Cool, thanks - you just reinforced that idea :-) I will make an appointment next week to have the driveshaft shortened.

Denis
'67 Camaro RS
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Old 03-21-2004, 04:09 PM
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Go for at least one inch, and pop in a new seal. Check and see if the leak is at the seal or the weep hole in the end of the yoke.

The output shaft should be alright. Good Luck

Troy
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Old 03-21-2004, 06:27 PM
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Thanks, Troy. The leak is between the shaft and the seal. I will check with the shop how much they'd charge me to shorten the driveshaft out of the vehicle and the labor to remove it.

Denis
'67 Camaro RS
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Old 03-21-2004, 07:05 PM
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Just cut a 1/2 inch or so off of the spline that fits into the trans. Take a grinder and taper the end where you cut it and take a little file to the splines to clean them up.

No need to cut the shaft, reweld, rebalance for that amount.
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Old 03-21-2004, 07:55 PM
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What about the other end of the yoke that is against the seal?
When the car comes down past where it normally sets , the yoke moves forward into the trans. Something has to give.

Troy
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Old 03-21-2004, 08:04 PM
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The spline slips on that seal.....there is generally enough area for it to slide in a little further once you cut a bit off the end. It may need a little cleaning up with some emery paper.
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Old 03-21-2004, 10:02 PM
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I guess you lost me there. The yoke slides on the output shaft which is splined, but the seal is on the outside of the yoke, if the yoke goes in to far it will damage the seal.

A shorter yoke will not stop that from happening, It could also break the tail housing when it jams into the trans.

Troy
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Old 03-21-2004, 10:22 PM
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Re: wrong driveshaft length?

Quote:
Originally posted by darom
Hi guys,

It seems that my hotrod car project can never end. I bought and installed myself a 10 bolt 8.5" 3.73 posi rear-end that came out of Nova on my 67 Camaro. I swapped a non-posi 3.08 10 bolt 8.2". Purches, aligning bumps on springs - everything went okay until I tried installing my old driveshaft.

Before the swap I could easily remove the driveshaft out of the TH350 transmission. Now I had to actually angle the rear pinion upward to allow the driveshaft yoke to go in. That was the only way to do it. Once lowered, the end play was about 1/4" or less. I did some digging on this site and general agreement is 1/2-1" end play.

Should I take the car to a driveshaft shop and have it shortened by 0.5" or more? My new rear transmission seal is leaking tranny fluid once the car is jacked up in the front. Did I damage the transmission shaft?

Thanks in advance,
Denis
'67 Camaro RS
On my 69 nova I found exactly the same thing when I switched to a 8.5" from a 8.2" 10 bolt. when I went to reinstall the drive shaft I found that is was about an inch to long. I just got it shortened an 1" and it was about perfect.
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Old 03-21-2004, 10:44 PM
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Robin,
Poncho came up with a slick idea of shortening the drive shaft. Did you cut yours, rewelded and rebalanced it or did you cut the shaft yoke spline only?

Thanks,
Denis
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Old 03-21-2004, 10:55 PM
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I acually just took mine in and got it cut, shortened,rewelded and balanced but I was reading poncho's idea and I can't think of a reason it wouldn't work as long as you were sure to clean off the yoke lower down where the seal will be riding. In my case though I wanted to get my drive shaft balanced anyway so taking it kinda killed 2 birds with one stone. One other possibility is to go to the wreckers and pull the drive shaft from a 73+ nova with the 8.5" .
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Old 03-21-2004, 11:18 PM
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I only wish, but there are no Novas here - they are all picked up. Unfortunately, the wreckers use forklifts to load cars on blocks, which completely mess up the drive shaft parts.

I will check with shops around, balancing the shaft sounds like a good idea.

On the other hand, if I go with Poncho's idea, instead of 1/2", would cutting 1" off the yoke spline be safe? Is the total length of the spline is about 3"?

Thanks!
Denis

Last edited by darom; 03-22-2004 at 12:19 AM.
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Old 03-22-2004, 02:10 AM
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A Nova driveshaft will be too long for the Camaro. Nova wheelbase is almost 3" longer.
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Old 03-23-2004, 03:09 AM
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You will need to measure the distance from the end of the yolk (where it spreads out to the universal joint) to the seal. 1" is great, but 7/8" is acceptable. On axle compression, the drive shaft normally moves forward. Hitting the seal would be a minor problem and probably only wipe out the seal. If the inside of the driveshaft yolk actually bottoms on the end of output shaft, things get serious as the compression pushes forward on through the mainshaft. I know that you can wipe out the engine thrust bearing surface if things go solid on a TH400 trans.
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