Gunters96lt1

iTrader: (21)

Guys,

I know this has been beat to death. Ive searched and cant find any answers. I am swapping a sbe turbo 5.3 into my LT1 T/A. I bought the Hughes adapter to use with my dished stock 5.3 flexplate. When I matted the trans to my mock up 5.3, the hughes adapter is too long and wont let the converter slide up to the flexplate. When I removed the hughes adapter and matted the trans up, the converter has about 1/8" gap from mounting tabs to the flexplate. And when bolted to the flexplate the pilot(correct name?) just barley slides into the crank.

Converter is a Revmax that I ran in my previous Turbo 383 LT1.

Anyone have this issue? If so whats the fix?

***EDIT***
Hughes adapter seated in crankshaft. This is the gap I have trying to push flexplate onto crank.


Here is when I have flexplate bolted to crank, trans bolted to motor. The pilot is just barley in the crank.


Here is my flexplate to converter mounting tabs gap. With out hughes adapter

FTICONVERTERS

iTrader: (3)

Have any pictures of the pilot(yes correct name) adaptor?

have you checked the bolt circle as well?

Gunters96lt1

iTrader: (21)

What do you mean by bolt circle?

**edit, yes I elongated the holes to match the converter.**

soloman369

iTrader: (13)

1/8 gap seems right on the money for a gap between flywheel and converter when trans is bolted to the engine. Are you just saying the pilot isn't long enough?

Gunters96lt1

iTrader: (21)

Basically. I am worried its not. I will try and mark the pilot tonight to see how far it is going into the crank.

To me it looks like it just barley slides in.

soloman369

iTrader: (13)

As for bolt circle, he was referring too the bolt pattern on the torque converter does it line up with the bolt holes on your fly wheel.

The picture you posted is a pilot extension these are used when a stock torque converter from a th350 or th400 are used so you can use it on an LS motor. I have one in my my car. The only part the slid into the crank was just the smallest part on the pilot extension were it cones down.

FTICONVERTERS

iTrader: (3)

Soloman is perfectly correct!

with the pilot extension you have make sure it goes all the way into the crank and all way over the pilot on the converter, it may be hanging up on something and that is why it appears to not being going all the way in.

Gunters96lt1

iTrader: (21)

Correct, and that's what I thought I needed. I can bolt the torque converter to the flexplate, have the pilot extension adapter slide into the crankshaft and my flexplate wont sit flush against the crank. The pilot bottoms out in the adapter keeping the flexplate from sitting flush against the crank.

Gunters96lt1

iTrader: (21)

It does. I cleaned the crank and the adapter slides all the way in.

and when I bolt the converter to the flexplate and go to slide it on my mock up motor the flexplate will not sit flush against the crank because of the adapter.

soloman369

iTrader: (13)

Honesty I don't see how the pilot extension will keep your flywheel from sitting flush on the crank. Is the flywheel bolted on to the engine at the moment ?

Gunters96lt1

iTrader: (21)

I can bolt the flexplate on the motor and slide the pilot extension on no issues. what I'm saying is if I bolt my converter to my flexplate, have the pilot extension sitting in the crank, I cant slide the flexplate with converter bolted to it flush against my crankshaft. Now this is on my mock up 5.3 I have on a cradle.

The reason I did this was to see if there were any issues before I mate my good 5.3 to my th350 before set them in the car.

soloman369

iTrader: (13)

Did you try putting the extension on the pilot of the torque converter? and bolting it up to the mock up 5.3, instead of putting it on the crank.


I attached a picture this is how your trying to bolt up the converter to the engine correct with the extension the the crank?

Gunters96lt1

iTrader: (21)

Yep. Done it both ways. Same result. I made sure seated on the pilot and the crank when trying each way.

How much of the pilot needs to be inside the crankshaft? (as if you don't need any adapters or spacers)

soloman369

iTrader: (13)

I believe its 1/4 and you should be good.

Gunters96lt1

iTrader: (21)

I definitely don't have 1/4"...maybe 1/8" at most.

soloman369

iTrader: (13)

Yeah you'd have to post some pics man. Rarely have i herd this being an issue.

Ok lets see. This converter was on your 383 LT1 witch I'm assuming was swapped to a th350 because the LT1 had the old style 4l60e. Was this converter made specifically to bolt up to the LT1 flywheel? or is its a stock revmaxx th350 converter.

Gunters96lt1

iTrader: (21)

I just talked with Revmax and he said that regular 350/400 converters are built for "lt1" style flexplates....or standard sbc.

soloman369

iTrader: (13)

Is the flex plate your using the same one that your going to bolt up to the good 5.3? or are you using the mock up 5.3 flex plate? Can you measure the hub/pilot coming out of the revmaxx converter.

Gunters96lt1

iTrader: (21)

Yep sure is. I will measure that tonight. Honestly I might order one of these weld on pilot extenders. I seen one of the vendors on here recommend one and it worked out for that guy. Then I wouldn't need to mess with the hughes adapter I already have.

http://www.sonnax.com/parts/1059-pilot

FTICONVERTERS

iTrader: (3)

1/8" pilot engagement is fine