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Old 05-28-2009, 06:57 PM   #1 (permalink)
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SLP Underdrive pulley install

Has anybody had any issues with a standard SLP 100225 underdrive pulley installation? GM mechanic is worried about the keyway being a passage for oil leakage. Should it be filled with sealant? Personally I donít see it being an issue since the seal is at the shaft, not at the pulley but it would be silly not to ask.
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Old 05-29-2009, 11:52 AM   #2 (permalink)
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Re: SLP Underdrive pulley install

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Originally Posted by Strings99 View Post
Has anybody had any issues with a standard SLP 100225 underdrive pulley installation? GM mechanic is worried about the keyway being a passage for oil leakage. Should it be filled with sealant? Personally I donít see it being an issue since the seal is at the shaft, not at the pulley but it would be silly not to ask.
I've got no direct experience to share with you relating to the Vette underdrive pulley specifically, but I have been running the SLP underdrive pulley on my GMC Sierra's 5.3 LM7 (which is an LS base motor sharing many parts) for quite awhile now and no problems. No oil leakage that I can see.

I've actually been a little curious to see if the part numbers differ between the SLP I'm running on my truck and the part number for the vettes.


Also I've gotta ask, are you, or most other Vette owners who run the underdrive pulleys, also running an overdrive alternator pulley, or a more powerful alternator???
Unless it's a track/strip or dyno queen, I can't see running the vehicle like that long term and it doing any good for the system...

I upgraded to a 200amp alternator on my truck, but I also switched over to e-fans too, so it sounds a bit overkill, but I think it balanced out nice, running at just over 14 on the guage (however accurate that is).
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Old 05-29-2009, 02:13 PM   #3 (permalink)
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Re: SLP Underdrive pulley install

The underdrive pulley issue is a long story. I ran an underdrive pulley a few years back to solve an overheating issue with the power steering pump in my ’97 F-body in drivers ed track events. Worked quite well and toned down the overheating. I never really had any charging issues. I really never noticed the HP increase either; it was purely to solve the overheating issues. Now my C5 is eating power steering pumps due to overheating / overdriving them. Installing the new power steering pump requires a whole lot of equipment to be removed such that installing an underdrive pulley at this time is a relative breeze. I would never install an underdrive pulley on a C5 for the 5 to 10 HP. It’s nowhere close to be worth the work but if the can is apart it was a no brainer. On my way to pick it up now. Hopefully I made the right decision.
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Old 05-29-2009, 04:03 PM   #4 (permalink)
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Re: SLP Underdrive pulley install

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Originally Posted by Strings99 View Post
The underdrive pulley issue is a long story. I ran an underdrive pulley a few years back to solve an overheating issue with the power steering pump in my í97 F-body in drivers ed track events. Worked quite well and toned down the overheating. I never really had any charging issues. I really never noticed the HP increase either; it was purely to solve the overheating issues. Now my C5 is eating power steering pumps due to overheating / overdriving them. Installing the new power steering pump requires a whole lot of equipment to be removed such that installing an underdrive pulley at this time is a relative breeze. I would never install an underdrive pulley on a C5 for the 5 to 10 HP. Itís nowhere close to be worth the work but if the can is apart it was a no brainer. On my way to pick it up now. Hopefully I made the right decision.

That's interesting, first time I've heard of that... you often have power steering pump problems or what???
Kind of a band-aid fix though... but you're right, I wouldn't want to be tearing into the pump replacement right now either.
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Old 05-30-2009, 06:30 PM   #5 (permalink)
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Re: SLP Underdrive pulley install

Particularly at Mid Ohio the sustained RPMs on track are rather high. This is over driving the power steering pump. On the F-bodies it was a very common problem. Initially I did not have a problem with this. I suspect that moving up to the 315/17’s did not help matters either. Back when I was running the F-body the underdrive pulley was a suggested fix and I had good luck with it. The proper solution is a power steering cooler but when I had the thing in pieces it was a no brainer to install the pulley. I basically got the pulley installed for an additional $165 plus parts. Had I not had that opportunity there is no way I would have ever installed the underdrive pulley. Way too much work! I may still install a cooler but I’ll cross that bridge when it comes. For now it’s nice the have my toy back!
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