Tranny mount torque specs

Nimrod · Apr 7, 2013

I'll be replacing the transmission mount today in my '99 XJ. It's probably not critical, but I'm wondering what the correct torque is for the bolts securing the crossmember to the unibody, and for the nuts that secure the mount to the crossmember. Anyone have that information handy?

2000bluexj · Apr 7, 2013

I dont remember off the top of my head, But def use antiseize. Esp on the bolts holding the mount into the trans

souske · Apr 7, 2013

Gutentight

Nimrod · Apr 7, 2013

souske said:
Gutentight

That's pretty much what I figured.

Nimrod · Apr 7, 2013

2000bluexj said:
I dont remember off the top of my head, But def use antiseize. Esp on the bolts holding the mount into the trans

Thanks for the tip.

kastein · Apr 7, 2013

Don't break em. Other than that, open season.

cruiser54 · Apr 7, 2013

kastein said:
Don't break em. Other than that, open season.

You must know how to keep from stripping a bolt, don't you?

Stop 1/4 turn before it strips............

5-90 · Apr 8, 2013

Nimrod said:
I'll be replacing the transmission mount today in my '99 XJ. It's probably not critical, but I'm wondering what the correct torque is for the bolts securing the crossmember to the unibody, and for the nuts that secure the mount to the crossmember. Anyone have that information handy?

If you use any sort of lubricant, don't forget to reduce installation torque to get the same tensile preload (and not pull the threads out of something instead!)

FSM torque specs are on my site, I need to add a few I've picked up since. www.kelleyswip.com/tech.html - start there.

EDIT - For the cushion-to-crossmember stud nuts, I like to replace those with Nylon-collar locknuts - every time. They stay put so nicely...

Nimrod · Apr 8, 2013

Thanks all. I got it done.

OHIOMAN · Apr 9, 2013

Since you just replaced it, would you happen to recall what size nuts those are that attach the mount to the crossmember? I'm trying to replace mine but do not have the right nuts.

ROBZ95Xj · Apr 9, 2013

OHIOMAN said:
Since you just replaced it, would you happen to recall what size nuts those are that attach the mount to the crossmember? I'm trying to replace mine but do not have the right nuts.

5/16 course thread

OHIOMAN · Apr 9, 2013

Thanks

kastein · Apr 9, 2013

ROBZ95Xj said:
5/16 course thread

Sorry, that's wrong dude, they're M8x1.25. Factory nuts are part number 11502811, flanged staked all-metal lock nuts.

ROBZ95Xj · Apr 9, 2013

kastein said:
Sorry, that's wrong dude, they're M8x1.25. Factory nuts are part number 11502811, flanged staked all-metal lock nuts.

my bad was going of the poly replacemnt i had

OHIOMAN · Apr 9, 2013

Ok, got it now. Thanks.

XJEEPER · Apr 9, 2013

When I replaced my mount a few months ago, I snapped off one of the 4 xmember studs like it was a twig (non-factory Jeep)....did some creative welding of a new bolt to fix it, so go easy on the torque.

5-90 · Apr 9, 2013

OHIOMAN said:
Since you just replaced it, would you happen to recall what size nuts those are that attach the mount to the crossmember? I'm trying to replace mine but do not have the right nuts.

M8-1.25 - AFAIK, they've always been ISO.

If you force it on, you can fit a 5/16"-18, but it's not recommended (5/16"-18UNC and M8-1.25 are often confused.)

Tranny mount torque specs

Nimrod

Degenerate Jeeper

2000bluexj

NAXJA Forum User

souske

NAXJA Forum User

Nimrod

Degenerate Jeeper

Nimrod

Degenerate Jeeper

kastein

NAXJA Member

cruiser54

NAXJA Forum User

5-90

NAXJA Forum User

Nimrod

Degenerate Jeeper

OHIOMAN

NAXJA Forum User

ROBZ95Xj

NAXJA Forum User

OHIOMAN

NAXJA Forum User

kastein

NAXJA Member

ROBZ95Xj

NAXJA Forum User

OHIOMAN

NAXJA Forum User

XJEEPER

NAXJA Member # 13

5-90

NAXJA Forum User

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