heres a tricky one for anyone knowlegable on th-350's - 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 05-20-2012, 09:24 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
heres a tricky one for anyone knowlegable on th-350's

here's the issue: trans is newly rebuilt. all standard parts replaced ie:clutches, seals, o-rings, gaskets, etc. trans has b&m shift kit installed. its actually a th-350-c, ya know, lockup converter(not hooked up tho) lockup not used pulled from a wrecked 87 scottsdale, 9"tailshaft. trans fluid normal. no leaks. manual valve is adjusted properly, governor working properly, case vent installed(shouldnt matter). now that thats out the way......trans when cold will take its sweet time engaging from park to drive, park to reverse, basically you put it in gear and it will start moving when its dang good and ready. once hot and been driving for a bit it will go from park to drive or reverse with no problem. now i have noticed that it seems to need more "gas" to move in reverse almost like theres lots of stall in the converter(which is 1800rpm btw). it shifts firm and fine, just finicky when cold. not sure if i have a valvebody gasket leak or the low/reverse piston is leaking down. maybe the direct drum piston is leaking down seeing as its not discriminating from foreward or reverse? just curious as to what is causing this. trans is out the car and i'd like to know what to look for BEFORE i tear it down. i did install the piston seals with a dulled out hacksaw blade which is why i suspect apply piston leakdown. other than leaking seals on apply pistons does anyone else have any good ideas? kinda stumped. thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-21-2012, 12:03 AM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 309
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
did u use teflon sealing rings thell do that in a th 350 and 400 use metal rings make sure the drum is wore were the rings go also look at the boost valve in the valve body if wore will do that to sonnax sells a replace ment there about 70.oo if u have a non lock up valve body se if the boost valve is bigger most are and if not wore out use it the boost valve is in frront of the pressure regulator spring
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-22-2012, 09:03 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
i used whatever seals came with the rebuild kit. i know the band is kevlar and i have the alto red eagle clutches. i didn't fully install that shift kit. not out of laziness tho, needed the car to run asap. i left out the spring in the valve body because i couldnt figure out how to get that darn roll pin out to release the valve. someone told me the trick to it but i forgot how it goes. the pins are in blind holes so i cant just tap them out. the trans isnt being used right now. i dont have a car to put it in, just want to fix it while everything is easily accessible. will bolt it to a warmed over 350 to test it out once i'm done.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-22-2012, 10:15 PM
Registered User
 
Last photo:
Join Date: Aug 2011
Location: NorthRichlandHills, TX
Posts: 452
Wiki Edits: 0

Thanks: 132
Thanked 7 Times in 7 Posts
Sounds like a fluid flow issue somehwere.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-22-2012, 10:22 PM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 309
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
if u got a parts store overhaul kit they usually have teflon rings start from scratch look at the drums closely and the valve body
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-24-2012, 09:29 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
ima check the valve body and install that spring i left out. my next silly question is where do i get replacement valvebody gaskets? havent heard back from b&m. the transpak gaskets are different from stock so i'm not sure where else to get them. unless i can reuse the gaskets(which i'm sure i cant). i may sell that engine i mentioned above, whats a good price for a 350 bored 60 over, performance heads with 202 valves making 310ft/lbs to the wheels and 240hp @wheels, flywheel numbers dont matter. these figures were calculated by chassis dyno 98%humidity 97*outside, third gear pull(1:1 ratio) so the numbers are accurate as can be. engine will be sold turnkey with accessories, drop it in and go. has 1000 miles on it. .030 dished pistons perfect for boost, no nitrous pistons are hypereutectic. its an eagle rotating assy. block is an 87, mech fuel pump, 2 bolt main, 2 piece rear seal. just not sure what a fair price on it would be. smokes the tires easy with an 1800 stall. good lil truck motor i think, not right for my camaro. an ls7 however....
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-25-2012, 06:56 AM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 309
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
just make the two holes under the transfere plate
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-25-2012, 07:35 AM
tnsmith10's Avatar
when will it rain???
 
Last photo:
Join Date: Jul 2003
Location: where its very dry and dusty
Age: 43
Posts: 1,297
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by gonzo08383
here's the issue: trans is newly rebuilt. all standard parts replaced ie:clutches, seals, o-rings, gaskets, etc. trans has b&m shift kit installed. its actually a th-350-c, ya know, lockup converter(not hooked up tho) lockup not used pulled from a wrecked 87 scottsdale, 9"tailshaft. trans fluid normal. no leaks. manual valve is adjusted properly, governor working properly, case vent installed(shouldnt matter). now that thats out the way......trans when cold will take its sweet time engaging from park to drive, park to reverse, basically you put it in gear and it will start moving when its dang good and ready. once hot and been driving for a bit it will go from park to drive or reverse with no problem. now i have noticed that it seems to need more "gas" to move in reverse almost like theres lots of stall in the converter(which is 1800rpm btw). it shifts firm and fine, just finicky when cold. not sure if i have a valvebody gasket leak or the low/reverse piston is leaking down. maybe the direct drum piston is leaking down seeing as its not discriminating from foreward or reverse? just curious as to what is causing this. trans is out the car and i'd like to know what to look for BEFORE i tear it down. i did install the piston seals with a dulled out hacksaw blade which is why i suspect apply piston leakdown. other than leaking seals on apply pistons does anyone else have any good ideas? kinda stumped. thanks
is the filter tight? did you use the provided gasket? if so, id be looking at the pump as there are different gear thicknesses for the 350 pump.
a pressure check cold can confirm this.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-25-2012, 07:20 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
filter is tight, pump working fine. no slip once it feels like working. just that initial throw into drive. after that i can park it(without shutting the engine off) and throw it back into gear and no problems. just a finicky lil trans
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-25-2012, 09:38 PM
Registered User
 
Join Date: Feb 2011
Location: 10312
Posts: 135
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
350 delayed clutch engagement

forward and direct outer piston lip seals are slightly different in size you got them correct?
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 05-28-2012, 02:44 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
Quote:
Originally Posted by anglia427
forward and direct outer piston lip seals are slightly different in size you got them correct?
yeah they are correct.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 05-28-2012, 10:15 PM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 309
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
i still think its the regulator valve in the valve body
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 05-29-2012, 07:57 PM
gonzo08383's Avatar
Registered User
 

Last journal entry: brakes
Last photo:
Join Date: Jan 2012
Posts: 158
Wiki Edits: 0

Thanks: 2
Thanked 9 Times in 8 Posts
Quote:
Originally Posted by joshp83
i still think its the regulator valve in the valve body
yeah you may be right. i'll post when i have time to tear it down. def looking hard at that valve body
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 05-29-2012, 11:19 PM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 309
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
just went threw that 2mo ago on a street rod also look for groves cut into the fwd drum from the rings
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 05-30-2012, 07:39 AM
tnsmith10's Avatar
when will it rain???
 
Last photo:
Join Date: Jul 2003
Location: where its very dry and dusty
Age: 43
Posts: 1,297
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by gonzo08383
filter is tight, pump working fine. no slip once it feels like working. just that initial throw into drive. after that i can park it(without shutting the engine off) and throw it back into gear and no problems. just a finicky lil trans
this is common with 350's, this only happens when cold after sitting all night basically. it wont want to move. once the pump primes, everything is fine. the reason i know this is the problem is because i had one in a car i used to own. i put it together with leftovers that my dad had. the trans was complete but, a basket case (he used to have built units on the shelf so he just swapped in another unit). everything was cherry but the problem was exactly what your dealing with. by the time i got to it, my dad had forgot what the problem with it was and i threw it together.
so, if you still dont think thats the problem, hook up a pressure gauge and see what you have for pressure when it doesnt want to move.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Heres the new guy Skip1 Introduce Yourself 3 03-15-2008 02:09 PM
Really tricky question Ratoflic Engine 5 04-15-2006 10:43 AM
Tire Tricky question Ratoflic Hotrodding Basics 3 01-14-2005 03:06 PM
heres another one IROC100 Hotrodders' Lounge 2 01-07-2005 08:22 PM
Heres one! 87442lover Hotrodders' Lounge 1 08-05-2004 07:51 AM


All times are GMT -6. The time now is 10:52 PM.


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.