T56 trans mount to trans stripped threads

[nick729]

Hey, i've just tried to install Energy Suspension trans mount for the T56 magnum and i've stripped one of the threads on the transmission.

I was having a hard time finding the torque value for the bolts used for mounting trans mount to the transmission, so i went with 35nm just to be on the safe side. One bolt tightened fine, the other one stripped the threads on the transmission. Later, after more thorough research i found that the torque value is even higher - it is meant to be 50nm (according to the T56manual)

I am very confused as to what happened and what to do next? Any thoughts/suggestions?

By the way, finding the right bolts for the trans mount was a mission.. Blueprint kept saying they are M10x1.5 (which is partly true, but these are the inner holes which are not used for the Type 65), I used 7/16-14 bolts, but now thinking back, maybe they are not the right bolts and hence why it stripped the threads??

[Rsnake]

Put a helicoil in and call it a day.

[nick729]

Thanks! It took me 2 weeks to get those 2 damn bolts shipped to me, off i go to find the helicoils and wait for them to ship.. :(

Could someone confirm if 7/16-14 is the right bolt though? I am starting to think that maybe it is not the right pitch, since i used energy suspension trans plate to trans mount bolts and they seemed to fit ( by the way this was official BP advise on how to find the right bolt, since they don't know...). That's how i came up with that bolt size.

When tightening the first bolt even the 36nm seemed sketchy, nevermind the required 50nm. Something is not right here...

[burchfieldb]

Pick up one of these, it will save you a lot of frustration.
194761

[jgray]

Pick up one of these, it will save you a lot of frustration.
194761

I have one of those and would be lost without it. But I have had a number of issues with threads. I overtightened some of the studs coming through the hubs and had to get more studs. I have also over tightened (seems to be a theme) riv-nuts and screwed up the threads but generally a tap has fixed that. I've yet to use helicoils but did watch a YouTube that shows they are stronger. Fully expecting I will be using them at some point!
Good luck nic729 - and thanks for posting this issue as I will pay more attention when I get to that point.

[nick729]

I have one of those and would be lost without it. But I have had a number of issues with threads. I overtightened some of the studs coming through the hubs and had to get more studs. I have also over tightened (seems to be a theme) riv-nuts and screwed up the threads but generally a tap has fixed that. I've yet to use helicoils but did watch a YouTube that shows they are stronger. Fully expecting I will be using them at some point!
Good luck nic729 - and thanks for posting this issue as I will pay more attention when I get to that point.

Problem solved - incase somebody else has the same issue, the correct bolt size is 1/2-13. Since neither, Blueprint nor FFR were able to clarify what the correct bolt is for the trans mount, i was told to try different bolts and see which ones fit, i only had 7/16-14 bolts and they seemed to fit - which is what i did. Turns out the 7/16 bolt just created its own thread on the edge of the threads, hence, it looked like it was the correct bolt, but it wasn't and that's why i couldn't torque them to 50nm.. Removed the bolts and the damage was relatively miniscule, so i could just use the 1/2 bolts without issue and get them torqued to spec.

Thanks @jgray for measuring the right bolt!

[jgray]

Glad it worked out!

[cc2Arider]

I had a similar observation for my TKX. The 7/16-14 just seemed loose but then got tight in the middle of my hand torqueing. I'll have a look at the 1/2-13...

Craig C

[weendoggy]

I've never seen any of the Tremec's with a 7/16-14 pitch. Most are 1/2-13