Underdrive pulley for LT4?
Thread Starter
Racer
Joined: Dec 2000
Posts: 279
Likes: 7
From: L.A., CA.
Underdrive pulley for LT4?
Where can I get an underdrive pulley for a '96 LT4?
This is a different pulley setup from the LT1.
I've tried the obvious sources: March, LG, and ASP
Just one of the things that I am doing to preserve the power steering unit.
This is a different pulley setup from the LT1.
I've tried the obvious sources: March, LG, and ASP
Just one of the things that I am doing to preserve the power steering unit.
Advanced
Joined: Jan 2002
Posts: 59
Likes: 0
From: Dallas Texas
Re: Underdrive pulley for LT4? (Zpeedstr)
I am pretty sure the LT4 came factory equipped with a pulley that is the same as the LT1 aftermarket performane type. Buying another would be redundant. Check this site if you get a minute.
http://www.lt4.com
http://www.lt4.com
Melting Slicks
Joined: Dec 1999
Posts: 2,816
Likes: 2
From: Austin, TX
Re: Underdrive pulley for LT4? (Zpeedstr)
The stock LT4 pulley / dampener is the same diameter as the LT1. The only difference is that the dampener is tuned for 2 separate speeds to handle higher RPMs.
Getting to your question, ATI sells a 10% underdrive pulley / dampener that will work with LT1 or LT4 'vettes. Summit Racing sells them. I have it and it's a very good quality piece. Pain in the rear to install though -- make sure you have a proper harmonic damener installation tool.
Getting to your question, ATI sells a 10% underdrive pulley / dampener that will work with LT1 or LT4 'vettes. Summit Racing sells them. I have it and it's a very good quality piece. Pain in the rear to install though -- make sure you have a proper harmonic damener installation tool.
Le Mans Master
Joined: May 1999
Posts: 6,839
Likes: 0
From: Louisville,KY
Cruise-In I Veteran
Cruise-In II Veteran
Re: Underdrive pulley for LT4? (Zpeedstr)
Dyno(DynoJet) test showed No Gain...I would save my $$$ for something else.
I check out all the hardware before I buy. :yesnod:
I check out all the hardware before I buy. :yesnod:
Thread Starter
Racer
Joined: Dec 2000
Posts: 279
Likes: 7
From: L.A., CA.
Re: Underdrive pulley for LT4? (JB'S LT4)
March does not sell a LT4 underdrive pulley.
The stock LT4 pulley is about 6.75" diameter at the grooves.
This is underdrive diameter in most catalogs.
I am looking for something about 6.0-6.25" diameter.
R
The stock LT4 pulley is about 6.75" diameter at the grooves.
This is underdrive diameter in most catalogs.
I am looking for something about 6.0-6.25" diameter.
R
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
Re: Underdrive pulley for LT4? (Zpeedstr)
ya, the stock LT4 is definitely smaller than stock LT1.
i don't think they have them as small as you're looking for, but try ATI. i know they make 2 different sizes, i just can't remember what they are.
i've often wondered why no one sells an underdrive gear kit for the water pump.
i don't think they have them as small as you're looking for, but try ATI. i know they make 2 different sizes, i just can't remember what they are.
i've often wondered why no one sells an underdrive gear kit for the water pump.
Race Director
Joined: Oct 2000
Posts: 14,064
Likes: 1,166
From: N. Alabama
Re: Underdrive pulley for LT4? (MSR)
Not a good idea to slow down the water pump according to my experience. I have noticed lower temperatures while cruising at 80 MPH in fifth rather than sixth gear. The water pump circulates more water. :yesnod:
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