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Old 08-17-2002, 10:59 PM   #1
alta-aj
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Gear Noise

I have a 69 Chevy 4x4 with a Rockwell T221 linked to an SM465 4 speed. Both have just recently been rebuilt but ever since I can remember (and that's a long time cuz my dad bought the truck brand new) they have been noisy when travelling above 45 mph or so. Although I think it is the T.C. that's the culprt< I'm not sure. I just have standard gear oil in these boxes at the moment. I'm wondering if any of you have recommendations on a type of oil that might quite things down some?
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Old 08-18-2002, 02:34 PM   #2
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Turn up the radio.hehe
Those are some noisy trans.
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Old 08-20-2002, 09:43 PM   #3
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My truck has the same setup and everything is stock and works great, but it still has a noise to them at speed. I think it is mostly my tranny though. I think it is the nature of the beast.
Like he said, turn up the radio!
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Old 08-20-2002, 11:53 PM   #4
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I don't have all the answers, but aren't the gears in the Rockwell straight cut? If so, they will make more noise. . . .
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Old 08-21-2002, 04:00 PM   #5
Yukon Jack
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No suggestions my way either. I have a 3 speed manual and Rockwell T221 and it's pretty noisy . . . and I don't have a radio to turn up!
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Old 08-28-2002, 06:53 PM   #6
69gmcfleet
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I believe that the Muncie SM465 has damn near straight cut gears also. My truck in 4th gear has a high whining noise to it. I am not sure about the Rockwell case since I never leave 2nd in 4wd. My truck rides way to rough to hit speed. I would say the Rockwell gears are straight cut also.
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(originally had 305ci V-6)

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Old 08-31-2002, 08:48 PM   #7
alta-aj
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Angry Thanks for your input guys.

- I was just hoping that there was a gear oil that could help.

OK, I'll turn the radio up - in fact, just got lucky enough to find an original AM/FM - for $10. There was no slider bar though - it cost me $20! - Now I can 'pump out the tunes!' - ya, right!

Cheers all,

Al
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Old 09-03-2002, 09:59 AM   #8
Mike C
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There should be virtually ZERO gear noise from the trans/transfer case in top gear and high range. Both of these scenarios send power STRAIGHT through without any gears carrying a load. Sounds like R&P noise to me. My 465/205 combo is pretty darn quiet on the road (tires and 4.10 are a different story however). Put the transfer case in 4 high though, and who needs an indicator light? You will KNOW it is engaged from the massive amounst of gear noise from the straight cut gears of the 205.
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Old 09-03-2002, 10:14 PM   #9
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Prone to gear whine

Rockwell cases the power gets transfered to the idler shaft and then to the output shaft in 2H. The gear whine will be louder when the idler shaft gets wear between the gear and shaft (this causes misallignment therefore louder whine), not too much you can do with it. I fixed mine up good, but it did requier modification and a whole new idler shaft. As far as transmission whine there really shouldn't be any in high gear. Power is transmitted straight thru, the counter shaft is still spinning though, but with no load there should be no whine. As far as lube my '67 GM service manuel says "Either SAE 80 or SAE 80-90 multi-purpose gear lubricant". Ditto that for the transfer case.

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Old 09-03-2002, 10:31 PM   #10
Mike C
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Another reason to lose the Rockwell!
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Old 09-05-2002, 09:20 AM   #11
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deaden the sound...

my 67 4x4 whines pretty bad too... the loud stereo is ok but some heat shield/ sound dampening material (mines from jcwhitney) has done alot to make the sound levels inside the cab liveable... be sure to buy alot of the material for it takes alot to do an effective job...
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Old 09-05-2002, 09:51 AM   #12
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Quote:
Originally posted by Mike C
Another reason to lose the Rockwell!
That seems a little extreme: the noise is mechanical music!

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