dville_gt

iTrader: (5)

I have a TH350 converter for SBC, ran it on my LT1 for a few months before I sold it and it bolted up just fine.

Now I am trying to run it behind my 2005 LQ9 with the GM adapter and the longer flexplate bolts. No dice.

If I put the adapter on the the crank and the flexplate on top the converter snout has about 1mm between it and the adapter.

If I put the adapter on top of the flexplate the snout of the converter bottoms out yet the mounting surface of the converter is no flush with the flexplate, probably over about 3/16th's of an inch gap.

From the thread about TH350 swaps it doesn't mention any of the flexplates not being able to use the adapter so I am lost.

Here are pictures of my flexplate (off my LQ9) and my adapter (from GM).

bozzhawg

I thought the 2005 lq9's were 58x reluctors?

orangenotch

iTrader: (1)

His crank sensor is black so its like the older ones. Thats the right spacer man/right bolts also. Flat flexplate is what you need.

S10xGN

iTrader: (11)

From what I've read here (search!), the spacer goes on the crank, then the FLAT flexplate. This spaces the converter snout and the converter bolts. If you have the curved flexplate, the flexplate goes on first then the spacer. In this case, the spacer is only for the converter snout. I can verify the first instance, I'm using the flat flexplate...

dville_gt

iTrader: (5)

I have tried it both ways, if I put the spacer on first the snout doesn't meet up to the adapter, and if I put it on after the flex plate the converter bottoms out in the adapter and still doesn't meet up to the flexplate.

gofastwclass

iTrader: (2)

Show me a pic of the back of the block where the crank flange is. If it is flush with the block you need the adapter, if not you don't.

Where the bolt holes are will line up with the aluminum cover if you need the spacer. If the flange sticks out .400" like my picture you don't need the spacer. It sounds like you don't need it.


...and I hate to be obvious but the dished style flexplate will only fit one way... Make sure the ring gear lines up with the starter or you will be trying to canoe upstream without a paddle.

rockoosi1

iTrader: (1)

I thought that the 6.0 engines didn't require anything to bolt up to the older trannys. I'm running a LQ4 and TH400 and it bolted right up.

S10xGN

iTrader: (11)

Right! Some of the truck cranks are +0.400" longer and don't require the spacer.

BlueZee28

iTrader: (7)

'99 and '00 6.0L blocks don't need the spacer. The '01+ blocks do. Easy way of figuring out if it's a '99 or '00 is if it has cast iron heads, it's a '99 or '00.

odarabla

iTrader: (1)

Agreed, I had the same issue when I swapped in my th350 from the 4L60E on a 2002 Camaro Z28. Went with the TCI flex plate.

dville_gt

iTrader: (5)

My crank does not look like the picture above, it is pretty much flush with the back cover.

Those TCI plates are expensive!

speedtigger

iTrader: (16)

That is your answer is right there.
The GM spacer is for use with the corresponding truck flat flexplate like in this kit:
https://ls1tech.com/forums/13720181-post27.html

$750 L98

iTrader: (7)

For the love of god do not use the "dished" plate with the spacer. I can show you what happens if you "try to make it work" like the shop did with mine. Eats up the converter, the plate, the trans pump, input shaft....

dville_gt

iTrader: (5)

This looks like the way to go! I paid that much for my adapter alone!

gofastwclass

iTrader: (2)

Interesting, I have about 10,000 miles on my Thunderbird with a factory dished flexplate and a spacer behind my 5.3. Details are in my build topic.

It's all about the install. When will people (yes, even shops) learn when something doesn't fit there is a problem and forcing it won't work. Sounds like you trusted the wrong people.

RATBOX

iTrader: (26)

Bringing back a thread from the dead, rather than start a new thread, I figure.

I ran into a similar issue last night with my '01 LS1 and TH400 fox swap.
I'm running a TH400 converter and a TCI flywheel kit.
Problem is, I put the adapter that fits into the end of the crank and then hold the converter up against the flex-plate and it has a gap that's probably a 1/4 inch between the foot pads on the converter and the TCI flexplate. WTF??
I called the company that made the converter, and the builder said to take an exact measurement of the gap, minus .125 and he'd machine me spacers to go between the converter foot pads and the flex-plate. But, while that could theoretically work, I can't see why this should be necessary and makes me worry I'm band-aiding it. The kit is supposed to make it a bolt together affair so wtf why am I seeing the gap?

CLIFFS: 01 LS1 camaro 5.7, TH400, TCI flexplate kit and the converter doesn't fit flush with the TCI flexplate.

RATBOX

iTrader: (26)

Anyone?

Gray86hatch

iTrader: (83)

Spacers are very common. ALmost a required thing with hybred engine and trans swaps.

Tim

CL2000

iTrader: (1)

6.0 truck motors with the 6.0 flex plate DO NOT need an adapter. I have put th350 and 400s in like this.

RATBOX

iTrader: (26)

So you're saying it's not uncommon at all to have to put spacers between the converter and flexplate to make it mate together correctly? I did this swap in a freinds '99 Z28 a couple yrs ago using the TCI kit and a Redneck brand converter and it didn't require spacers between the converter and flexplate so that's why I'm a bit stumped at this point.
Has anyone here had this come up in a th350/th400 onto a LS1 swap and used these aforementioned spacers??