New Trans is Noticeably Louder

doc hopper · Posted: Wed Jul 23, 2014 6:37 am Post subject: New Trans is Noticeably Louder

When the trans in my stock 70 bug went south, the only IRS replacement I had immediately available was a new Rancho Pro Street that had been sitting comfortably in my den for a couple of years.

I had it installed along with new OEM mounts but used the same clutch.
The trans shifts just fine, but seems a lot noisier than the stocker that it replaced. This is especially true at about 3,000 rpm regardless of what gear I'm in. Not noisy like there's something wrong .... just ... louder.

Would a Pro Street trans have ingredients that would would just naturally raise the sound level?
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Glenn · Posted: Wed Jul 23, 2014 7:03 am Post subject:

New/tight bearings.
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beetlenut · Samba Member Joined: May 27, 2009 Posts: 2983 Location: RI

Assuming you didn't forget the gear lube, my guess would be it just needs to break-in. Has it even had its first oil change after break-in yet? If it's still noisy after the first oil change and about 500 miles, then I might start to become concerned.
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doc hopper · Posted: Wed Jul 23, 2014 8:22 am Post subject: New Trans

Okay ... guess I'll let it break in for a while. It only has about 200 miles on it right now.
Thanks for the info
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cseay1 · Posted: Wed Jul 23, 2014 9:26 am Post subject:

What fluid are you using?
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doc hopper · Posted: Wed Jul 23, 2014 2:40 pm Post subject: New Trans is Noticeably Louder

I was able to talk to one of the techs at Rancho Transmissions just a bit ago. He told me that the Pro Street will, in fact, be noisier than stock because the Pro is set up with "closer tolerances".

So: more noise, but also stronger.
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"Honesty hath no fence against superior cunning"

modok · Posted: Wed Jul 23, 2014 5:10 pm Post subject:

yeah they can be louder. It's not necessarily a problem.


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