Tiny Flywheel to Torque converter bolts

Jonno77

Jonno77

Member
Just a simple question. What size are the 4 bolts that tie my flywheel to my torque converter on my 345 to my 727?? I am swapping in the 3speed and removing my manual. I have it all bolted in but missing those 4 small bolts. Any advice? Thread lock? Thanks for your help scouters!
 
Jon, those bolts are nothing special. They don't even need to be g-8's. They are a very common, course thread, hex head bolt no longer than an inch. Sorry, I don't have the specific dimensions. Be sure to get them good and snug. Too loose and you'll get a sound that is very similar to a low end engine knock while the engine is running. Did you remember to install the starter spacer shim which is critical for proper starter drive gear to flexplate engagement when going from a manual trans to an auto? Hope so.
 
The only spacer I installed was the one for the flywheel between the motor and the flywheel plus the small shim to allow the flywheel to spin free of the starter gear teeth. Is that what you mean? I am going from a t98 to a 727 behind my 1977 Scout II 345. Thanks!

Wait... I think I meant flexplate not flywheel... Anyway installing the big spacer without the small shim between the flexplate and spacer the flexplate teeth contact the starter teeth. With the shim everything seems to spin free. Do I have it right?

Thanks trever!
 
The one I'm talking about is @ 1/8" thick and shaped like the machined mount surface of the starter motor. It slips over the bull nose on the motor, so the motor must be removed from block in order to install the shim. This part is only used with 727 auto equipped engines. Don't crank the starter without one!
 
Wow. Thank you! Outstanding advice. So the starter needs to be backed out a bit to work properly. Gotcha
 
Perzactlee. I have some more specs on the bolts. The threaded portion is 7/16" long. Thread diameter is 5/16" and appears to be a 24 pitch...so they aren't course thread as I wrongly stated last night. It looks like the stockers are case-hardened, though I've seen standard grade in that location a number of times and haven't heard of any failures there.
 
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