Anyone running 4.56's
Thread Starter
Instructor
Joined: Jul 2007
Posts: 236
Likes: 0
From: Mobile Alabama
Anyone running 4.56's
I'm changing the pinion bearing and thinking of changing to 4.56 with 6 spd LT1. What RPM would I be at going 75? Mostly around town so will only be on Interstate a little. Looking for that stoplight pickup - thoughts and idea's.
Le Mans Master
Joined: Apr 2000
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From: DrunkDefender
CI 1-2-3-4-5-6-7-8 Veteran
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St. Jude Donor '07-'10
4:56 IMO would be overkill for a mildly modded LT1. Not saying it cant be done and be alot of fun but 4:10s would suit a mildly modded 6 speed much better. That being said, I have 4:10s and wish I had went with 4:30s but mine is cammed and revs to 6500rpms, rev limiter set at 6700. Not a big difference and certainly not enough to change it out now.
FWIW, I think these 6 speed cars should have come from the factory with 3:73 with 4:10s an option. There is very little penalty to having 4:10s. At interstate speeds I'm at or just under 2k rpms in 6th gear.
FWIW, I think these 6 speed cars should have come from the factory with 3:73 with 4:10s an option. There is very little penalty to having 4:10s. At interstate speeds I'm at or just under 2k rpms in 6th gear.
Melting Slicks
Joined: Dec 2009
Posts: 2,233
Likes: 285
Arent most guys that go to 4.56 & up gears are trying to cross the finish line at their peak power? Like fine tuning the gearing. In the past guys would run these short gears b/c the wide slicks were so tall, there wasn't drag radials in every size.
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Yukon Gear offers a 4.56 ratio R&P for the D44HD - but you'd have to grind the crap out of the case. I had to grind on mine just a little to fit their 4.10 ring gear in - as it almost touched.
here's a link to the 4.56 gear.
http://www.ringpinion.com/ProductDet...px?ProdID=3502
Will
here's a link to the 4.56 gear.
http://www.ringpinion.com/ProductDet...px?ProdID=3502
Will
Racer
Joined: May 2009
Posts: 421
Likes: 2
From: van buren ar
depending on the situation you may be able to have the ring gear turned down on its outside edge.we have removed as much a 1/2 inch of overall diameter off ring gears to get them to fit in some of the offroad buggies we build at the shop where i work.the only problem is that you are limited to only one or two of the acceptable drive/coast patterns.
Melting Slicks
Joined: Dec 2004
Posts: 2,687
Likes: 1
From: Manteca CA
I think that is too much gear for a LT-1. All you will do is spin the tires in 1st gear, and run out of revs before you know it. I run 4:10's in my Stock LT-4 and have to be careful of excessive wheel spin at rolling start in 1st gear. And that is with 315 rears.
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