Mcloud sfi bellhousing question

[DeathProof88]

A question for all who have an older mcloud bellhousing, I just slid my TKX into place and went to install the 7/16 bolts and they don't tighten! None of them! The bolts get a little bit tight and then pop loose. They don't have any damage to them that I can see either. It's like they are possibly m12? Can anyone please confirm this? M12 nor 1/2 will for through the TKX holes either. I'm screwed! (This is a used bellhousing from a reliable source) thanks in advance.

 

[rednotch]

HMS TKO/TKX Transmission To Steel Bellhousing Bolt Kit - GM 1/2" x 13 - 1 1/4″ 12-PT – Hanlon Motorsports

This HMS Transmission to Bellhousing Bolts are built right here in the USA, are built from high grade steel. Kit includes hardened washers

www.hanlonmotorsports.com

HMS TKO/TKX Transmission To Aluminum Bellhousing Bolt Kit - GM 1/2" x 13 - 1 1/2" 12-PT – Hanlon Motorsports

This HMS Transmission to Bellhousing Bolt Kit works on all GM TKO/TKX Transmissions to Tremec and Lakewood Aluminum Bellhousings.

www.hanlonmotorsports.com

May need 1 1/2". They where 1/2-13 if I remember right. Hanlon has a bolt kit but its listed as gm for the tko/tkx might want to give them a call, I haven't used one with a tkx yet.

 

[Trogdor]

While investigating the same bellhousing I found this photo of the instructions.

In the lower right there is a note regarding the bolts for the transmission.

 

[DeathProof88]

Ok I guess I have to pull the trans back out.. thanks guys!

 

[DeathProof88]

Ok, done, I pulled the TKX out, used a 1/2" reamer to open up the holes and 1/2-13 bolt is the ticket. Thanks for your help guys!

 

[Monkeybutt2000]

This happened to me over 20yrs ago with a Tremec 3550. Installed it myself after work,went to thread in the bolts,no bueno. Pulled trans,had to drill to correct size. WASN"T in the instructions.