Go Back   LS1TECH > CHASSIS, SUSPENSION, APPEARANCE > Automatic Transmission
Sign in using an external account
Register Forgot Password?
Search

Automatic Transmission
4L60E | 4L80E | TH350 | TH400 | TH2004R | Powerglide | Converters | Shift Kits
Sponsored by
PerformaBuilt Transmissions

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 11-23-2001, 03:00 PM   #1
TECH Apprentice
Garage is empty, add now
 
Trans Am WS6 420's Avatar
 
Trader Rating: 7
Join Date: Nov 2001
Location: North Florida
Posts: 364
Default TH350 vs TH400...... Whats the difference?

I have noticed that a lot more people with 10 second or lower LS1's are moving to a 3 speed auto. But there seems to be a mix of TH350's and TH400's. What is the differences between the two? Can a 350 hold 800+ rwhp?

- Matt
__________________
Just a few toys that are always broken...
Trans Am WS6 420 is offline   Reply With Quote
Old 11-23-2001, 03:40 PM   #2
TECH Senior Member
Garage is empty, add now
 
Colonel's Avatar
 
Trader Rating: 0
Join Date: Nov 2001
Location: Troy, AL
Posts: 9,245
Default Re: TH350 vs TH400...... Whats the difference?

The TH350 is a lighter transmission that can built just about as strong as a TH400 (some say JUST AS strong.)

800 RWHP? It will but not forever. That's alot of power!
__________________
Stephen Sanders
2000 422CI Z28
First hydraulic cam Gen III in the 9s NA
BEST RUN:60FT 1.40, 1/8 6.25/110.37, 1/4 9.82/136.84
(It was also the 2nd internally stock in the 11s and the 1st internally stock in the 10s on N2O.)
2002 Z28 A4 3525 lbs, 3.23 gears, TCI 3500 stall, worked LS6 heads/Stealth II cam
Best times-60FT 1.55 (17" Nittos) 1/4 11.20/121.47
Colonel is offline   Reply With Quote
Old 11-23-2001, 03:48 PM   #3
Southern Fried Director
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Nawf Carolina
Posts: 2,556
Default Re: TH350 vs TH400...... Whats the difference?

TH350 is lighter, and takes less power to spin, but it wont last as long.

I'd say 1st gear is different, but I dont know how much. If you look hard enough you can find a TH350 with lock-up also, which will help retain some streetability over a TH400. I believe one of the 9.50 or faster LT1s has a lockup TH350. They were used in vans and some pickups weren't they?

J.
__________________
. _ _ _ _ _ _ _ _ . _ _ _ _ . _ _ _ . . _ _ . . . . _ _ _ _ _ _ . . . _ _ _ _ . _ . . .
Crazyquik is offline   Reply With Quote
Old 11-23-2001, 04:16 PM   #4
TECH Resident
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: Houston, Tx
Posts: 851
Default Re: TH350 vs TH400...... Whats the difference?

Who sells a th 350 for our cars? Do our converters work with them(probably not, huh)?

Marty

[ November 23, 2001: Message edited by: Marty ]</p>
__________________
2000 z28 a3 11.79@113 1.58 60' RIP
1982 ws6 a3 ??????????
http://pub50.ezboard.com/bhoustonstreets
Marty is offline   Reply With Quote
Old 11-23-2001, 04:32 PM   #5
TECH Veteran
Garage is empty, add now
 
99 Black Bird T/A's Avatar
 
Trader Rating: 0
Join Date: Nov 2001
Posts: 4,303
Default Re: TH350 vs TH400...... Whats the difference?

TH400's were orginally so strong that GM decided the quality had to reduced because they lasted too long and held up too well. TH400 250,000 miles + was pretty common. TH400 was designed to hold up behind a Big Block with lots of torque.

A properly built TH400 can have a fair amount of weight reduction with careful selection of parts and this can help it be more effficent.

Not taking anything away from the TH350...but with massive torque I'd look at TH400's with updates very closely.
__________________
99 T/A TEA 5.3 S2 (very old ones), SRP-224 cam, MTI tune, LS6 intake, Hooker LT's, Mufflex Y, cut-out & SLP D/D- 4.10's -Dyno -418rwhp & 404 rwtq Arctic White 91 RS new 383 LS1 w/TEA 2.5 LS6 ready to install 72 Vette
99 Black Bird T/A is offline   Reply With Quote
Old 11-23-2001, 05:11 PM   #6
SSU Moderator
Garage is empty, add now
 
RyanJ's Avatar
 
Trader Rating: 0
Join Date: Nov 2001
Location: Allen, TX
Posts: 4,858
Send a message via AIM to RyanJ
Default Re: TH350 vs TH400...... Whats the difference?

350 saps less power

gears for anyone that wants them (standard planetary)

350 - 2.52 1.52 1.00
400 - 2.48 1.48 1.00
RyanJ is offline   Reply With Quote
Old 11-23-2001, 08:59 PM   #7
TECH Senior Member
Garage is empty, add now
 
WILWAXU's Avatar
 
Trader Rating: 5
Join Date: Nov 2001
Location: Sasebo, Japan
Posts: 14,377
Send a message via AIM to WILWAXU Send a message via Yahoo to WILWAXU
Default Re: TH350 vs TH400...... Whats the difference?

What kind of selection is there for gears?
__________________
John Brown
2007 Trailblazer SS
1971 Nova - Project Car
My FQuick Garage
WILWAXU is offline   Reply With Quote
Old 11-23-2001, 11:25 PM   #8
TECH Apprentice
Garage is empty, add now
 
Trans Am WS6 420's Avatar
 
Trader Rating: 7
Join Date: Nov 2001
Location: North Florida
Posts: 364
Default Re: TH350 vs TH400...... Whats the difference?

At what rwhp would you folks consider stepping up from a 350 to a 400?

- Matt
__________________
Just a few toys that are always broken...
Trans Am WS6 420 is offline   Reply With Quote
Old 11-24-2001, 12:16 AM   #9
On The Tree
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: LOS ANGELES
Posts: 135
Default Re: TH350 vs TH400...... Whats the difference?

THERE are many different gear ratios avail, for these tranzs, but are big dollars($500-$700over the standard price)when i switched over from my 700r4 to a th-400 i thought i would suffer in the 60 ft area because of the gear change(3.06to a 2.4)first gear- the car stayed in the same 60#s as before picked up about .05 in the 1/4 but lost 2 mph over the 700r4 i was satisfied with the stock gears in the th400, so if you want to change gears in one of these tranz, you might spend the $ in a better area
__________________
2002 SOM WS6 Auto
Just bought it back!
11.61 @117.9 N/A

Just sold it again
STMPDUST is offline   Reply With Quote
Old 11-24-2001, 02:53 AM   #10
TECH Senior Member
Garage is empty, add now
 
Colonel's Avatar
 
Trader Rating: 0
Join Date: Nov 2001
Location: Troy, AL
Posts: 9,245
Default Re: TH350 vs TH400...... Whats the difference?

I have a 2.75 1st gear in my TH350.

As far as the difference in strength between the 350 and the 400...I can't tell you first hand but there are many that swear that a 350 built just right is even stronger than any 400. Don't know, just hearsay. So far my 350 is working perfectly. <img src="images/icons/cool.gif" border="0">
__________________
Stephen Sanders
2000 422CI Z28
First hydraulic cam Gen III in the 9s NA
BEST RUN:60FT 1.40, 1/8 6.25/110.37, 1/4 9.82/136.84
(It was also the 2nd internally stock in the 11s and the 1st internally stock in the 10s on N2O.)
2002 Z28 A4 3525 lbs, 3.23 gears, TCI 3500 stall, worked LS6 heads/Stealth II cam
Best times-60FT 1.55 (17" Nittos) 1/4 11.20/121.47
Colonel is offline   Reply With Quote
Old 11-27-2001, 01:35 PM   #11
Moderator
Garage is empty, add now
 
BADZ's Avatar
 
Trader Rating: 5
Join Date: Nov 2001
Location: Montgomery Texas
Posts: 5,581
Default Re: TH350 vs TH400...... Whats the difference?

Not to worry, The th350 is a very heavy duty tranny. I have also the th350 with all the goodies inside and it seems to be far more a heavy duty light weight tranny and does absorb less power in spin then the th400..(fact)
__________________
HKE BUILT 427ci w/ ECS YSI KIT.
BADZ is offline   Reply With Quote
Old 11-27-2001, 07:49 PM   #12
Launching!
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2001
Location: St. Paul, MN
Posts: 220
Default Re: TH350 vs TH400...... Whats the difference?

Where could I get either one of these trannies...you never know!
__________________
***SIG EDITED!!! 8 LINES OF TEXT IS THE MAX!!!***
>>>Signature Policy - Click Here<<<
CRAGER - LS1TECH.com Staff
Jacobi is offline   Reply With Quote
Old 11-27-2001, 07:49 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
350, 400, difference, differences, power, powerglide, spin, th350, th400, transmission, turbo, vs, weight, whats, wiki


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 09:11 PM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details