TH350 Performance application informational thread - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-09-2004, 05:45 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
TH350 Performance application informational thread

I've noticed there are a lot of hit and miss threads about the TH350 transmission. None of them address the 350 as a performance transmission in detail. Can somebody address the following questions so that it can be found all in one thread.

First, given a stock TH350, what is the maximum horsepower and torque, given normal street tires and for the sake of argument a 3500 pound car, that this tranny can withstand?

Second, what upgrades need to be made to a TH350 to make it more reliable and stronger for a higher horsepower application? What are the cost of these upgrades at a reasonably priced tranny shop, and approximately what horsepower do these upgrades guarantee you?


THanks-

K

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-10-2004, 11:22 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
bumpidybumpidybump....
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-11-2004, 04:59 AM
Grumpy
 
Last photo:
Join Date: Dec 2002
Location: D.C.
Posts: 1,447
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The TH350 is NOT a performance tranny. It is a bit weak in stock form and has a final drive ratio of 1.0 compared to a 700R4s .7 and 200R4s .67.

A 200R4 or 700R4 has a MUCH better ratio of gears than a TH350 and thee 4 speeds allow you to run much lower(or higher how ever you want to say it) ratios above 3.23 and still have plenty of top end speed.

The TH350 is a thing of the past

anit I so nice
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-11-2004, 11:40 AM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
Hmm, maybe I should personalize the question a bit more. I own a TH350 and am building a 388 that's going to be putting out some pretty serious numbers (depending on heads btw 425 and 480 horse, check ryans stroker page combos 8-16. Choice btw Dart and AFR heads). Anyway, I'd like to keep the 350 but wonder what needs to be done to it and how much it will cost. 87442 you keep talking about the 2004r and how it is stronger stock than a TH350. Is this a worthwhile option?

10-4, please advise, over.

K
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-11-2004, 06:31 PM
dklong's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: sussex nb canada
Age: 49
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
the 200r4 and 700r4 are junk when it comes to high performance unless you have some mighty deep pockets to build them, then they still won't stand much, not like the th 350 and th 400 , the 200 and 700 do have a nice low gear and over drive . in stock form there only good for 200 hp.
the th 350 with after market one way clutch spragues and clutch packs with min clearances and a good shift kit will stand over 400 hp and 500 ft torque
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-11-2004, 07:18 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
Really? I did some searching on ebay and they had a bunch of 700's for under a grand that are supposedly beefed up with claims from 400-800 horse of reliability. You know, I think what kills a trans is the dig. One other question with the 700, if I have a 22-2400 stall and I end up cruising 2100 on the highway, wouldn't it be slipping and making a ton of heat? I'm confused on how that works. What are the parts that really need to be beefed up in these transmissions for them to be strong? I'm rather green when it comes to tranny parts, and I'd like to know what to say that I want in a Th350 or 700R4 when I'm looking for my performance trans. What would it cost to have these changes made?

K
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-11-2004, 07:50 PM
badknuckles's Avatar
you talkin to me?
 
Join Date: Nov 2003
Location: fort lewis, wa
Age: 33
Posts: 1,090
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
my brother in law has a 250hp motor and he has gone through 3 700's.
i have a camaro with a beefed up 350 pushing around 350hp and i have the factory 25 year old th350 in it still and it runs like a top.
dklong is definately right the 200 and 700r4's are trash i can believe the th350 will handle 400hp stock
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-11-2004, 10:01 PM
Member
 
Join Date: Oct 2003
Location: Arkansas
Posts: 413
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
The TH350 is NOT a performance tranny. It is a bit weak in stock form and has a final drive ratio of 1.0 compared to a 700R4s .7 and 200R4s .67.
I think this is stated backwards. A th350 is very strong in stock form. I got a buddy that run 6.60s in the eighth with a 383 stroker and nitrous. And using a stock trans with shift kit and 3000 stall and trans cooler. The car was running slicks and hooked great.

The overdrives can be made tough, for the right amount of $$$. Because of this a TH350 will never be a thing of the past.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-11-2004, 10:08 PM
FASTCHEVY's Avatar
RatRod B4 RatRods were Cool
 
Last photo:
Join Date: Feb 2004
Location: Dallas Texas
Age: 32
Posts: 800
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
first off 700R4=JUNK

2 why dosn't anyone talk about the vacuume modulater adjustment?
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-11-2004, 10:19 PM
Member
 
Join Date: Oct 2003
Location: Arkansas
Posts: 413
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Are you talking about the modultor, which is part throttle? Or dont you mean the governer that contols WOT shift? A reworked gov. can make a big difference. In stock form they are usually shifting way to early for a performance motor.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 02-11-2004, 10:24 PM
FASTCHEVY's Avatar
RatRod B4 RatRods were Cool
 
Last photo:
Join Date: Feb 2004
Location: Dallas Texas
Age: 32
Posts: 800
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally posted by firechicken383
Are you talking about the modultor, which is part throttle? Or dont you mean the governer that contols WOT shift? A reworked gov. can make a big difference. In stock form they are usually shifting way to early for a performance motor.
I'm talking about the gold vacuume modulater that hooked to manifold vacume. there is a little screw inside, if you turn it all the way in til it clicks, then turn it back 2 1/2 turns it should shift faster. at least that is what it did in my truck.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 02-12-2004, 07:42 AM
Grumpy
 
Last photo:
Join Date: Dec 2002
Location: D.C.
Posts: 1,447
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally posted by dklong
the 200r4 and 700r4 are junk when it comes to high performance unless you have some mighty deep pockets to build them, then they still won't stand much, not like the th 350 and th 400 , the 200 and 700 do have a nice low gear and over drive . in stock form there only good for 200 hp.
the th 350 with after market one way clutch spragues and clutch packs with min clearances and a good shift kit will stand over 400 hp and 500 ft torque
Ummm.... Where the #$&# are you getting your numbers from?

In STOCK form the 200-4R can stand 330HP and 550ft. lbs. of torque

The 700-4R is 350 by 650 ft lbs.

So get your facts straight!

BTW it takes 2 $15 dollar parts to "beef-up" a 200-4R, if your so cheap you can't afford $30.00 than I dont know what to say.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 02-12-2004, 07:17 PM
dklong's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: sussex nb canada
Age: 49
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
87442lover. I rebuilt quite a few th350's for example my brothers running a olds 455 with 340 hp and 500 ft of torque for the first 9 years he ran a stock th350 with a shift kit , with high miles , then I rebuilt it 3 years ago and all I replaced was some of the bushings and put the clutch packs to min clearences, it gets well abused, a rebuilt 700r4 only lasted 1 weekend for him then went too th350 and hasn't looked back. talk too anyone who has run a 700r4 , then too some who has run a th350 or th400 . the guys running the 700 has had 2-3 rebuilds compared to someone still running the stock th350.
Quote:
th350 is a thing of the past
87442lover people said that about the power glides when the th350 and the th400 came out and people are still running power glides with extremely high hp
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 02-12-2004, 09:13 PM
FASTCHEVY's Avatar
RatRod B4 RatRods were Cool
 
Last photo:
Join Date: Feb 2004
Location: Dallas Texas
Age: 32
Posts: 800
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The only reason the 700R4 was made is for economy, not for performance. it can be made better, for a price.
but why bother when you can pull a th350 from the junkyard
and put it right to work?
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 02-12-2004, 10:38 PM
Grumpy
 
Last photo:
Join Date: Dec 2002
Location: D.C.
Posts: 1,447
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally posted by dklong
87442lover. I rebuilt quite a few th350's for example my brothers running a olds 455 with 340 hp and 500 ft of torque for the first 9 years he ran a stock th350 with a shift kit , with high miles , then I rebuilt it 3 years ago and all I replaced was some of the bushings and put the clutch packs to min clearences, it gets well abused, a rebuilt 700r4 only lasted 1 weekend for him then went too th350 and hasn't looked back. talk too anyone who has run a 700r4 , then too some who has run a th350 or th400 . the guys running the 700 has had 2-3 rebuilds compared to someone still running the stock th350.
87442lover people said that about the power glides when the th350 and the th400 came out and people are still running power glides with extremely high hp
As I said the TH400 is a different story.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 12:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.