Need Help w/ LS Swap - 700R4
Thread Starter
Instructor
Joined: Dec 2007
Posts: 184
Likes: 4
From: Hilliard OH
Need Help w/ LS Swap - 700R4
Hey Guys,
I'm swapping an LS6 into my 85 AutoX car w/ the 700 R4 tranny. I thought I had all the needed parts, but now I'm having trouble getting straight answers on flexplate adapters.
I want to use my original torque converter & tranny. It is a manual valve body, so I thought I only needed the crank spacer to make it all work. But I am told that I need a 168 tooth flexplate to match the LS starter. Now I can't seem to find a 168 tooth flexplate that has a matching bolt pattern for my torque converter. And I don't know if the crank spacer will work right either.
Can somebody tell me where I've gone wrong, or what I seem to be missing? Do I really need the 168 tooth flexplate, or will my original stock 85 unit work fine? Is there a 168 tooth flexplate that is drilled to match my older torque converter, or do I need to get a later model converter?
I can't imagine that this should be such a big problem. Somebody please help.
Thanks,
Beerman
I'm swapping an LS6 into my 85 AutoX car w/ the 700 R4 tranny. I thought I had all the needed parts, but now I'm having trouble getting straight answers on flexplate adapters.
I want to use my original torque converter & tranny. It is a manual valve body, so I thought I only needed the crank spacer to make it all work. But I am told that I need a 168 tooth flexplate to match the LS starter. Now I can't seem to find a 168 tooth flexplate that has a matching bolt pattern for my torque converter. And I don't know if the crank spacer will work right either.
Can somebody tell me where I've gone wrong, or what I seem to be missing? Do I really need the 168 tooth flexplate, or will my original stock 85 unit work fine? Is there a 168 tooth flexplate that is drilled to match my older torque converter, or do I need to get a later model converter?
I can't imagine that this should be such a big problem. Somebody please help.
Thanks,
Beerman
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
The flexplate obviously has to fit the LSX engine first then you need to match the bolts holes to those of the convertor
http://www.summitracing.com/parts/tci-399753 fits 10.75 and 11.00 converters
http://www.summitracing.com/parts/tci-399754 fits 11.50 converters
Read
http://ls1tech.com/forums/conversion...wheel-use.html
post # 7
Last edited by vetteoz; Feb 13, 2013 at 04:45 PM.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
I have heard of converters that are made for an LS swap they have the LS1 bolt pattern and will fit the older TH350-700r4 trans.
I also found this.. I would take a look at the whole thread do a thorough search before you commit. I have not done this myself and can only relay the info. GL
http://ls1tech.com/forums/10992090-post6.html
I also found this.. I would take a look at the whole thread do a thorough search before you commit. I have not done this myself and can only relay the info. GL
http://ls1tech.com/forums/10992090-post6.html
heres how i did it.
flexplate pn 12551367 and spacer pn 12563532 and bolts 12563533
bellhousing bolts pn 11512767 and converter bolts pn 1261968
all chevy parts
this will bolt up skiping one hole
you must have vss signal.
get the in line adapter made by speed scene wiring PN LS61325
you will need some mounting plates to mate up with your old motor mounts which are everywhere or make your own.
thats it.
flexplate pn 12551367 and spacer pn 12563532 and bolts 12563533
bellhousing bolts pn 11512767 and converter bolts pn 1261968
all chevy parts
this will bolt up skiping one hole
you must have vss signal.
get the in line adapter made by speed scene wiring PN LS61325
you will need some mounting plates to mate up with your old motor mounts which are everywhere or make your own.
thats it.
Melting Slicks
Joined: Oct 2001
Posts: 2,315
Likes: 110
From: Brandon Fl
They make a kit to bolt it right in I have one out in the shop but can't get out there right now. I'll post the brand and part number tomorrow. I have the same set up but I opted for a new converter that had the difference needed built into the converter.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The two tooth counts available for Chevies are 153 and 168. I don't know offhand which one goes with which engines. My '86 has a 153 tooth flex plate.
There are flex plates with dual crank bolt patterns out there. There are also dual converter bolt pattern flex plates. I'm pretty sure you can get both in one flex plate. Look for "heavy duty" flex plates. They are thicker than the stock ones but have more "dish" to negate the extra thickness.
There are flex plates with dual crank bolt patterns out there. There are also dual converter bolt pattern flex plates. I'm pretty sure you can get both in one flex plate. Look for "heavy duty" flex plates. They are thicker than the stock ones but have more "dish" to negate the extra thickness.
Last edited by Cliff Harris; Feb 16, 2013 at 03:47 AM.
