ws6guy27

iTrader: (31)

Have a strabge dana s60 with a trutrac and 3.55 gears.. want to make a gear change but cant decide kn which gear to choose. I have a 2000ws6 m6. Built tranny. Clutch and everything. Also a strange driveline and yoke. All built stuff.. going be driving on street and strip. Was thinking 4.10s but my buddy keeps saying 3.73s.. opinions appreciated... also.. dpes anyone know prices?

silverz28camaro

iTrader: (20)

How much power and cu.in? I have always likes 3.90's when you can't decide between the two...If your N/A I'd go 4.10, If your hitting it with a big shot 100-125 or more I'd still not want to go 3.73, I'd say 3.90 bare minimum.

If turbo and 600rwhp+ I'd stay with the 3.55s

ws6guy27

iTrader: (31)

Its a 383 ls6 hyd roller cam 234 247... 620/624 with 114 lsa. Put down 459 at wheels witht he 3.55s... im going to do mods.. may get close to the 500rwhp range.

ws6guy27

iTrader: (31)

Do also plan using a 150-200 shot somthig along those lines soon alos

justin hover

A 3.55 to 3.73 jump is not worth the $ or labor at all. You probably wouldn't even notice the difference. 3.90 or 4.10s for sure. Granted 4.10s with a taller tire would perform the best.

HioSSilver

iTrader: (8)

3.73's would be good for you n/a. For the mph you should run on the nawz( ) you my need to leave the 3.55 in it......or run a 28" tire.

What's your car weight and rpm range?

It's way to easy to get over the top of 4.10's in these cars.

BOBS99SS

iTrader: (2)

I have done 3.73s in 2 cars,and 4.10s in 2,imo 4.10s in a m6 is the way to go,the 3.73s were good in my boosted stang ,but in the na one i didnt notice much of a gain at all,i know alot pends on tires n setup but imo i love the 4.10s in my m6

ws6guy27

iTrader: (31)

So since im na maybe a 175 shot 4.10s. Would b gpod on street snd off the line? I do also wanna make good times

ws6guy27

iTrader: (31)

Not sure what the car weighs its a 2000 ws6. Ls6 tubular suspension. Rpm range is 2200-6800

swoop

iTrader: (1)

Here is a gear calculator that you can punch in ratios to see what will work.

http://www.dragtimes.com/gear-ratio-...-mph-speed.php

HioSSilver

iTrader: (8)

4.10's are gonna suck for you unless your on a 28" tire or turning 7400 rpm. Anyone that tells you different simply don't know wtf they are talking about.

SMOKNSS

iTrader: (3)

I ran 4.10s in my M6 car with the factory 10 spokes (26" tire) and actually got better MPG in the city and ran faster at the track with them with just bolt ons (factory rev limiter at 6,200 RPM). I even stepped up to a 4.30 gear with a cam that did spin 7,400 and 28" tire.

A buddy of mine even has 4.10s in his DD (2002 Formula) and it is a fun car for just a lid and 4.10s. The only time you wouldn't like it would be on the interstate. RPMs are a little high to get decent MPG.

It seems to me like you might be a little in the dark about rear gears for M6 cars.

HioSSilver

iTrader: (8)

Not at all. I'm probably one of the few that has driven these cars with 3.42, 3.73, 3.90, 4.10 and 4.56's. Op has 460whp, even @ full weight and his rpm rage 4.10's would tax his car with stock height tires. I could only go 122@6800 with stock tires. That means I was already about 400 rpm past peak power......not really good for accelerating. Not to mention traction is a bigger problem with 4.10's. Op is gonna spray a 175 shot, that should put him well over 130mph....that only works if he is gona run a taller tire and/or turn 7000+rpm.

Do you realize @(5400rpm) peak power on a stock f-body is only 101 mph? It's easy to say someone might be in the dark when you do not know what your talking about.

FYI....me and a bud got his 99 Z28(a few bolt-ons)to go 116mph in the 1/4 with 3.73.....that mph is not even achievable with 4.10's on the stock rev limit and stock height tire.

ws6guy27

iTrader: (31)

I am in dark in m6 cars. I just need good advice.

guppymech

iTrader: (7)

With 4.10s and 28" tires you can go 140 mph at 7k rpm. (ref. f-body.org/gears) I don't suppose you'll be trapping that but I don't know. I think a engine with power adders responds better to a lower ratio (3.54 3.73) than a NA engine. Everything I've read says to gear a NA car to run through the traps at or slightly higher than peak HP rpm for best 1/4 mile performance.
On the street with 4.10s you won't have any traction unless you use DRs. At the same time going from 3.54 to 3.73 in your S60 is not much of a change.

Have you raced the car the way it sits now? What mph did it trap?

ws6guy27

iTrader: (31)

So what about 3.90 gears. Yes iv raced on street butbwith street tires.. waiting put dr on back. Amd iv hit 140 pretty easy

HioSSilver

iTrader: (8)

He didn't mention anything about running a 28" tire. Until someone does then I assume a stockish height tire.
3.90 gears rock....That's what I run. But with you having more power than me and wanting to spray it would be easy for you to get over the top of those gears too. I already am @130+ in the 1/4. If you would'nt mind turning your engine 7200 or so you could get by with them. You really need 3.73's if your gonna spray that big of a shot.....or make up your mind not to spray and run a little more gear.

That 175 shot should easily pick you up 12-15mph in the 1/4.....so you have to gear that in.

mikh338

iTrader: (16)

how many miles on your setup? im about to go turbo and need gears around what you have. i just happened to have a s60 with about 750 miles on the setup, broken in properly with 4.10 gears and the s track that i am going to pull and replace. i smell a trade in the works...4.10s with 28s and nitrous will be rediculous for you!!

etrain783

iTrader: (1)

With your setup if your looking for times..... 4.10s are bad unless ya goin et streets youll never hook unless you launch in 2nd if your lookin for more rwhp in the future stay with the 3.55 you will be able ta use your 1st hard

mikh338

iTrader: (16)

ive had several of my buddys run cam only ls1s around 400whp+ with 4.10s, 28" tires and nitrous and its deff the way to go. with that kind of power your going to need et streets or hoosiers etc...