What gear ratio would be better to use, 3.42, 3.73 ..... I have/had 3.08 ( i think) in my stock open rear. And I had great power off the line to top end. Is there a formula to use with the tranny ratios and powerband of the engine?

Thanks

 

Most board members recommend 3.23's or 3.42's. I've seen some guys running 3.73's, but I've also read posts where members say the 3.73's are a bit too steep with a T5, they're actually better suited for a T56 since first gear is 2.66. It's 2.95 in a T5 trans. I've been to a website that has a calculator for figuring out your starting line ratio (SLR), and the recommended SLR is between 10.1-12.1. You'll be within this range with 3.23 or 3.42 rear gears. I just found the website I was referring to. Go to www.5speedtransmissions.com and click on the link that says "New calculator: Calc distance travelled in first gear". This calculator will help you figure out your SLR with different rear end ratios.

 

Thanks!, I'll check it out

 

I have 3.73s and like the ratio, makes taking off the lines that much more enjoyable. It think it really depends on how you like driving on the highway. I run 2100rpm at 65mph and 2500rpm at 80mph, but I have an LG4 version of the T5 with the .63 overdrive I think. Different years and cars came with a .74 overdrive. Around town I can putt around in 4th gear.

If you're building an engine with a strong mid to topend rpm range I'd say 3.73s are must. It puts the engine closer to its powerband.

 

There were two OD's, IIRC, a .63, which was the slug in LG4's as trumps mentions, and a .73, which was the performance version used in L69's (with their 3.73's).

JamesC

 

Hey 92 RSS can you tell me a little about your intake, never seen one before and do you have any pic's of it apart?

 

It's made by Street and Performance, similar in a way to the Holley's Stealth ram unit.
Acually I do have it apart (for the past 5 years) I'll take some pictures of it, there is a few on my website.

 

I'am trying to find this Street and Performance website you have linked but looks like its dead and can't find it on the web, think you can direct me to it?

BTW if you can get some pic's of it that would be awesome, thanks man!

 

Tony, check here,
I'm trying to find all the pieces, my garage is a mess with Christmas boxes.
Their website is a bit cheesy, you need to goto their catalog and open......... well here is the Link to the pdf file

 

Hey thanks for the links.