what gears are you th400 guys runing? - LS1TECH

Log In 


Gears & Axles Driveshafts | Rearends | Differentials | Gears | 12 Bolt | 9 Inch | Dana

what gears are you th400 guys runing?

Reply
 
Thread Tools Search this Thread
Old 02-19-2008, 08:11 PM   #1
On The Tree
Thread Starter
 
wichoms4's Avatar
 
Join Date: Feb 2008
Location: SAN JOSE ,CA
Posts: 129
Default what gears are you th400 guys runing?

what gears are you guys runing with a th400? what rpm are you guys toping out at the 1/4? 9' or 12 bolt?
wichoms4 is offline   Reply With Quote
Old 02-19-2008, 09:44 PM   #2
TECH Addict
iTrader: (34)
 
Websy21's Avatar
 
Join Date: Jun 2007
Location: Alberta, Canada
Posts: 2,347
Default

This wouldn't pertain to all but just finished reading a thread in the FI section you should check out and it seems most are running a average of a 3.42 but anything from a 2.73 to 3.73 I am debating 3.25 or 3.50 in my 4l80e, same ****, different pile as a th400 but with an o/d.
Websy21 is offline   Reply With Quote
Old 02-19-2008, 10:21 PM   #3
On The Tree
Thread Starter
 
wichoms4's Avatar
 
Join Date: Feb 2008
Location: SAN JOSE ,CA
Posts: 129
Default

thanks. ill take a look. sorry im new to this site. please delette
wichoms4 is offline   Reply With Quote
Old 02-20-2008, 08:09 AM   #4
TECH Regular
iTrader: (1)
 
Jays00ss's Avatar
 
Join Date: Jul 2007
Location: Colorado
Posts: 430
Default

I have 3.73's in my 71 SS elcamino with a Built 402 Big block, th-400 and 12 bolt. They work really well for the track on 26" tires.
Jays00ss is offline   Reply With Quote
Old 02-20-2008, 10:31 AM   #5
TECH Addict
iTrader: (34)
 
Websy21's Avatar
 
Join Date: Jun 2007
Location: Alberta, Canada
Posts: 2,347
Default

No need to delete I don't think, just was pointing out a thread to you as FI is a different story as n/a for gears. I want higher gears to load my turbo so it will spool quicker and when it does it doesn't blaze my tires................. well as much anyways for N/A I'd go with 3.73 is a great all round comprimise for street and track but depends entirely on the whole setup though.
Websy21 is offline   Reply With Quote
Old 02-20-2008, 09:18 PM   #6
On The Tree
Thread Starter
 
wichoms4's Avatar
 
Join Date: Feb 2008
Location: SAN JOSE ,CA
Posts: 129
Default

im consurn a bout my rpm. dont want to be hitting the rev limiter before the end of the 1/4. wantting to forge the 346. if so want to do a 250 d.p set up. also im doing the rear, but still not sure of a 12bolt or a 9'? & what gears to get?
wichoms4 is offline   Reply With Quote
Old 02-20-2008, 09:54 PM   #7
Launching!
 
Join Date: Feb 2007
Location: Tucson
Posts: 297
Default

zombie has a turbo mounted in the rear, hes got a th400 with 2.75 gears. I think hes running tens if not low 11 for sure. who says 2.75 gears cant be fun or fast.
BigJls1 is offline   Reply With Quote
Old 02-21-2008, 03:29 PM   #8
TECH Addict
iTrader: (5)
 
RAGENZ28's Avatar
 
Join Date: Jun 2002
Location: Port Hueneme, CA
Posts: 2,470
Default

In my old car I had a TH400 RMVB Transbrake with 4,500 stall, 4.86 gears and revved to around 7800. I had a 33 spline strange axles, pro gear, 1350 strange c-moly yoke in a 12 bolt.

I'd just go with a 9" and run a modest gear, unless it's a straight race car I would guess you'd maybe run a 3.73? You didn't list much about your car.

Best way is to run your car as is and you'll have an idea around how much mph your car will run, then from there gear it to work with a 26" tire and when you add power and go faster you can step up to a 27,28,29" tire at the track to allow you to run more mph down the road.
RAGENZ28 is offline   Reply With Quote
Old 02-21-2008, 03:31 PM   #9
TECH Addict
iTrader: (5)
 
RAGENZ28's Avatar
 
Join Date: Jun 2002
Location: Port Hueneme, CA
Posts: 2,470
Default

Quote:
Originally Posted by BigJls1 View Post
zombie has a turbo mounted in the rear, hes got a th400 with 2.75 gears. I think hes running tens if not low 11 for sure. who says 2.75 gears cant be fun or fast.
That's true you don't need a lot of gear with a good power turbo car, one of our buddies runs a 3.08 gear and runs 7's on a drag radial.
RAGENZ28 is offline   Reply With Quote
Old 02-21-2008, 09:16 PM   #10
On The Tree
Thread Starter
 
wichoms4's Avatar
 
Join Date: Feb 2008
Location: SAN JOSE ,CA
Posts: 129
Default

my car is pertty much stock.
list: tsp ms4 camshaft, rosslers stg 2 th400 w/brake, ls6 intake, LT, ORY w/cut out, stock 10bolt with stock 3.42. hotches LCA & panhard, stock sway bar. full wieght. tuned at synergy motorsports by Rick. every thing else is bone stock.
wichoms4 is offline   Reply With Quote
Old 02-25-2008, 10:29 AM   #11
Banned
iTrader: (1)
 
Join Date: Aug 2007
Location: Houston
Posts: 92
Default

I'm running 3.73's w/ my tH400, but I'm crossing the line at 6400 rpm, mainly due to I am having some converter slippage issues. I think 3.73 is the way to go for the TH400.
ncnumber8 is offline   Reply With Quote
Old 02-25-2008, 04:39 PM   #12
10 Second Club
iTrader: (9)
 
Black8Banger's Avatar
 
Join Date: Jul 2004
Location: South Carolina
Posts: 638
Default

4.11s right now. They work well on 28" tires but 26" kinda sucks.
Im about to step back down to some 3.70s for nitrous
Black8Banger is offline   Reply With Quote
Old 02-25-2008, 08:41 PM   #13
LS1TECH Sponsor
iTrader: (33)
 
Steve Burger's Avatar
 
Join Date: Jul 2002
Location: Out on the farm in Central IL
Posts: 4,403
Default

What is your max RPM, what size tire, and what do you estimate trap speed at. I had 4.33s with an NA 347. 7200 at 128 on a 28" tire.
Steve Burger is online now   Reply With Quote
Old 02-25-2008, 08:50 PM   #14
TECH Addict
iTrader: (5)
 
RAGENZ28's Avatar
 
Join Date: Jun 2002
Location: Port Hueneme, CA
Posts: 2,470
Default

Put some 5.29's and throw some D's on it
RAGENZ28 is offline   Reply With Quote
Old 02-25-2008, 08:55 PM   #15
9 Second Club
iTrader: (30)
 
code4's Avatar
 
Join Date: Apr 2004
Posts: 1,405
Default

Quote:
Originally Posted by BigJls1 View Post
zombie has a turbo mounted in the rear, hes got a th400 with 2.75 gears. I think hes running tens if not low 11 for sure. who says 2.75 gears cant be fun or fast.
Zombie is running 10.0xx. I run a 2.75 gear in mine as well but a turbo car is a different animal.
code4 is offline   Reply With Quote
Old 02-25-2008, 10:58 PM   #16
10 Second Club
iTrader: (16)
 
02SS:ZEUS's Avatar
 
Join Date: Jan 2006
Location: Wichita Falls, TX
Posts: 1,012
Default

I've got 4.11's in mine now with a 28" tire. I need to go to a 3.73. I run out of gear 50 feet from the 1/4, and the car tops out at about 128 mph. It runs 10.40's now, and won't go any faster until I get the 3.73's in it.
02SS:ZEUS is offline   Reply With Quote
Old 02-25-2008, 11:06 PM   #17
On The Tree
Thread Starter
 
wichoms4's Avatar
 
Join Date: Feb 2008
Location: SAN JOSE ,CA
Posts: 129
Default

hey guys sorry been away for a min. well the motor is stock 346 my rev limiter is set at 6800 rpm's dont want to run out of rpm's by the end of 1/4. 3.73 it is.
wichoms4 is offline   Reply With Quote
Reply


Tags
308, gears, mvb, th400

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 10:26 PM.