Flexplate bolt pattern? - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old June 5th, 2009, 09:55 AM   #1
JeepMann
10 Years
 
JeepMann's Avatar
 
Join Date: 11-05-05
Location: Waterford, MI
Posts: 7,094
iTrader: (18)
Mentioned: 0 Post(s)
Send a message via AIM to JeepMann
Default Flexplate bolt pattern?

Are there different bolt patterns for the torque converters for different transmssions? I am running a 700R4 but the bolts for the torque convereter don't line up. The flexplate was last used on the engine mated to a th350. I looked on napa & autozone's websites but there are differences listed for bolt pattern. Am I missing something here?
JeepMann is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old June 5th, 2009, 11:44 AM   #2
Kodiak450r
Keep on truckin
 
Kodiak450r's Avatar
 
Join Date: 11-14-07
Location: Waterford, MI
Posts: 5,911
iTrader: (19)
Mentioned: 1 Post(s)
Default

what engine? i know the flexplate on my 350 has 2 different patterns on it.
Kodiak450r is offline   Reply With Quote
Old June 5th, 2009, 12:15 PM   #3
JeepMann
10 Years
 
JeepMann's Avatar
 
Join Date: 11-05-05
Location: Waterford, MI
Posts: 7,094
iTrader: (18)
Mentioned: 0 Post(s)
Send a message via AIM to JeepMann
Default

Quote:
Originally Posted by Kodiak450r View Post
what engine? i know the flexplate on my 350 has 2 different patterns on it.
350, older block from the late 70s. I will have to look to see if I have 2 patterns on it too...hmmm thanks for the heads up.
JeepMann is offline   Reply With Quote
Old June 9th, 2009, 04:57 PM   #4
PavementPounder
I am the law.
 
PavementPounder's Avatar
 
Join Date: 11-05-05
Location: Birmingham, Michigan 48009
Posts: 29,824
iTrader: (224)
Mentioned: 2 Post(s)
Default

Yes. Recently had my flexplate replaced on the 87 Suburban with 350/700r4 and there was a pattern difference issue.
PavementPounder is offline   Reply With Quote
Old June 11th, 2009, 09:31 PM   #5
SammySmalls
Senior Member
 
SammySmalls's Avatar
 
Join Date: 02-04-09
Location: Farwell, MI
Posts: 437
iTrader: (2)
Mentioned: 0 Post(s)
Default

There are always 2 patterns on chevy flexplates, inner tri, and outer tri.
SammySmalls is offline   Reply With Quote
Old June 12th, 2009, 11:42 AM   #6
PavementPounder
I am the law.
 
PavementPounder's Avatar
 
Join Date: 11-05-05
Location: Birmingham, Michigan 48009
Posts: 29,824
iTrader: (224)
Mentioned: 2 Post(s)
Default

Quote:
Originally Posted by InspectorCloussou View Post
There are always 2 patterns on chevy flexplates, inner tri, and outer tri.
Except for the ones that one have one pattern.
PavementPounder is offline   Reply With Quote
Old June 22nd, 2009, 02:29 PM   #7
JeepMann
10 Years
 
JeepMann's Avatar
 
Join Date: 11-05-05
Location: Waterford, MI
Posts: 7,094
iTrader: (18)
Mentioned: 0 Post(s)
Send a message via AIM to JeepMann
Default

OK i did in fact have 2 bolt patterns so I am good there. Next question though......The torque converter is engaged in the trans but it sits about a 1/2" or so from the flexplate. Is this normal? If I draw it in will disengage from the trans?

Just for extra info, this is a late 70s 350 block with a flexplate that was mated to a th350 and bolting up to a 700R4.
JeepMann is offline   Reply With Quote
Old June 22nd, 2009, 03:57 PM   #8
Kodiak450r
Keep on truckin
 
Kodiak450r's Avatar
 
Join Date: 11-14-07
Location: Waterford, MI
Posts: 5,911
iTrader: (19)
Mentioned: 1 Post(s)
Default

yes you pull it up to the flexplate. this is normal.
Kodiak450r is offline   Reply With Quote
Old June 22nd, 2009, 06:07 PM   #9
Brods
Senior Member
 
Join Date: 01-21-07
Location: Salem, Mi
Posts: 704
iTrader: (2)
Mentioned: 0 Post(s)
Default

Considering the notch in the converter shaft that drives the trans pump is only about " deep, Id check to be sure that a good portion of the notch still engages the pump in the trans with the converter bolted to the flex plate.

TCIs installation instructions call for a minimum of 1/8" but no more than 3/16" of converter movement. You can use washers (preferably precision ground ones) between the converter and flex plate if necessary. Youll most likely need longer bolts as well. That is what was recommended by TCI and has worked for more than 10 years with one of their towing converters in my truck.

Here is something that came up in a simple Google search: http://www.partshp.com/ConverterInstructions.htm Do some searching on your specific combination or go to the converter manufacturer's site for the most accurate info.
Brods is offline   Reply With Quote
Old June 22nd, 2009, 08:37 PM   #10
JeepMann
10 Years
 
JeepMann's Avatar
 
Join Date: 11-05-05
Location: Waterford, MI
Posts: 7,094
iTrader: (18)
Mentioned: 0 Post(s)
Send a message via AIM to JeepMann
Default

Thanks Brods for the information.

The reason I bring this up is because years ago I built a S10 blazer with a similar engine/trans combo and I burnt up the trans pump after about 1000 miles. The trans guy told me that my converter wasn't engaged enough and caused the failure. I was never sure if this was true or he was just blowing smoke being I was pretty young at the time.
JeepMann is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Chevy Tech

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

Forum Jump


All times are GMT -5. The time now is 01:58 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.13888 seconds with 50 queries