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  #1  
Old 03-11-2010, 01:00 AM
Midnight87
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Default driveshaft question

Some time back I installed a 700R4 into my '87, it originally had the METRIC 200 in it. I had to shorten the driveshaft 3 inches and I thought all was well. I recently swapped in a 3:73 posi out of an '86 Monte Carlo and now I get a slight vibration at high speed. The shaft must be just a tad out of balance which wasn't noticeable with the 2:40 gears. I also have the shaft out of the Monte Carlo, is there any chance that shaft would be the proper length?
Thanks.
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  #2  
Old 03-11-2010, 03:03 AM
Millard Millard is offline
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Check that your u joints are not out of phase.
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Old 03-11-2010, 04:40 AM
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moterhead moterhead is offline
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Pinion bearing? Possibly crush sleeve not torqued enough? Just a couple of things I'd check. Good Luck!
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Old 03-11-2010, 06:30 AM
Midnight87
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u joints are oriented proper and the differential was never apart, it is "from the factory" set up. Like I said, this was not an issue until the lower gears started spinning the driveshaft faster. Does anyone know if the El Camino & Monte Carlo shafts are the same length?
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Old 03-11-2010, 07:06 AM
georgiamadman georgiamadman is offline
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No...the monte had a 200R4 from the factory its the same lenghth as a 350 or metric 200.
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Old 03-11-2010, 11:30 AM
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Quote:
Originally Posted by georgiamadman View Post
No...the monte had a 200R4 from the factory its the same lenghth as a 350 or metric 200.
Thank you.
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Old 03-11-2010, 11:42 AM
steelybill steelybill is offline
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Make sure the bushing in the 700R4 tail housing is tight on the slip yoke. If it's not tight, you will be chasing other things to get the vibration issue solved. The higher ratio, and drive shaft RPM may be enough to set it off. That bushing is the same one as the TH350.
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Old 03-11-2010, 01:06 PM
stev6343 stev6343 is offline
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Midnight, rotate the driveshaft 180 degrees. That may be an easy fix for balance.
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Old 03-11-2010, 08:43 PM
steelybill steelybill is offline
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Good call. When the balance is OK, it's a good idea to mark the shaft and companion flange when removing the shaft, so it goes back where it runs best.
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Old 03-11-2010, 09:57 PM
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Thanks guys.
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  #11  
Old 03-12-2010, 09:56 AM
old_coot old_coot is offline
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All drive shafts have a harmonic speed at which they will "wobble". Having higher gears will make it show up at a lower speed. the best way to alter it to a higher rpm is to change the material to a lighter weight shaft --as in aluminum or carbon fiber....It may be perfectly balanced and just be the harmonic doing it. remember the El camino drive shaft is longer than and other---short of trucks, and they usually use a two peice driveshaft to avoid the harmonic there. This is a fairly common complaint on a long wheel base vehicle...........Dan
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Old 03-12-2010, 10:20 AM
steelybill steelybill is offline
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Here is a place that has all the info,

http://www.iedls.com/ Inland Empire drive line service. All you ever wanted to know about drive shafts, engine and trans angles, pinion angle on rear etc,
When I'm ready for a new drive shaft for my Elco/Caddy 500 project, that's where I'm gonna get one made.
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  #13  
Old 03-12-2010, 10:41 AM
PaPa Johns 77 PaPa Johns 77 is offline
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Quote:
Originally Posted by stev6343 View Post
Midnight, rotate the driveshaft 180 degrees. That may be an easy fix for balance.
Have done this many times and it worked!
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