Transmission Mount Help please

[RAAAR1]

Hey All,

On my newly acquired 1979 CJ5 the rubber Transmission mount is totally worn away. The replacement part I got from 4wd seems to be too thick, I cannot get the skid plate to mount properly now...any ideas? Would it be really bad to just leave it since it shifted just fine without it before?


thanks,
Chris

 

[Saddle Tramp]

In a word, NO. The Transmission mount is the third point of the 3 point mounting system for the motor and Transmission . If the part is too big then you have the wrong one. All of the mounts are aftermarket today but a proper one is available. Also there should be a piece of flat steel with a large round hole on the side that fits between the bottom of the Transmission and the top of the mount. This is for the torque stud that helps to control drive train “twist” during acceleration.

 

[Saddle Tramp]

Here are some pictures of the torque stud (aka Transmission stabilizer) bracket, stud, and bushings. You can see the bushings to the torque stud on the left side of the bracket picture. When I go to bolt the skid plate back up the weight of the motor/Transmission /Transfer Case is on a jack stand positioned at the back of the motor. I then put the skid plate on a pump jack and jack it up until I can align the holes up including the Transmission mount. Once the mount/Transmission are loosely bolted together I use longer bolts than normal for the skid plate and get them started. (At this point the skid plate will not be tight to the bottom of the frame) I then will use the pump jack to raise the plate up a little then tighten the bolts a little and adjust as needed to get everything to line up until the skid plate is in place and all is properly tightened.

 

[Bent]

Get the correct mount! If you hit a good rock while going down a steep hill, you're engine/Transmission /Transfer Case will travel forward and your fan will kiss your radiator. Much cheaper to replace the mount. In fact, if the Transmission mount is in bad shape you probably need to replace the motor mounts also. You need all three to be in good condition. Look into polyurethane if you want to upgrade.

 

[IOPort51]

The trick that I use on Transmission mounts. This requires two floor jacks.

Jack up and support the Transmission under the bell housing, put the 2nd jack under the skid plate and remove bolts holding it to frame. lower the skid plate enough to get the mount in and bolt it to the skid and the TC with the skid still movable. jack up the skid, line up and bolt the skid to the frame. It is a lot easier to mount the skid to the frame than to move the TC enough to line up the mount bolts. You have more leverage to line up the skid than you do to line up the Transmission to the mount.

Once again, what sounds like the hard way is really the easy way.

 

[Hedgehog]

But for most of us it would be:

1 - Jack up the Transmission /Transfer Case

2 - unbolt crossmember

3 - Wrestle the crossmember down

4 - Clean up 30+ years of accumulated sticks, mud, sand, grease and rust

5 - use a steel brush to clean then prime and paint .... drink a beer and waint for drying

6 - remount cross member, scratch up new paint with a bolt you didn't notice, bolt up cross member and Transfer Case mount .... drink beer

7 - Test drive ... #@#%%%# at the last minute remember to remove the jack ..... Start test drive in the rain with bikini top on, be happy.

 

[RAAAR1]

Hey All,

Thanks for the replies and info. Its good to see that my unposted thoughts were not too far off from what most of you are saying..

But, mostly, thanks for the help..its quite nice to see as a "new guy" on here that there is no blasting etc for what should be a simple thing for me to do..thanks again!


Chris

 

[Techlight]

I'm sure you'll find that this is about the only non-blasting forum on the internet...Which is why I'm still here and love this forum.

You rarely even see "that question has been asked before, go look it up"...usually it's a very polite, "here's a link to the discussion" lol.

Good luck with it all. It's nice to be a Jeep owner with a thousand Jeep friends...too bad we couldn't all go wheeling together

 

[IOPort51]

But for most of us it would be:

1 - Jack up the Transmission /Transfer Case

2 - unbolt crossmember

3 - Wrestle the crossmember down

4 - Clean up 30+ years of accumulated sticks, mud, sand, grease and rust

5 - use a steel brush to clean then prime and paint .... drink a beer and waint for drying

6 - remount cross member, scratch up new paint with a bolt you didn't notice, bolt up cross member and Transfer Case mount .... drink beer

7 - Test drive ... #@#%%%# at the last minute remember to remove the jack ..... Start test drive in the rain with bikini top on, be happy.

I didn't mention the beer, I figured he could work that out for himself.

you have a cross member, he has a skid plate.

 

[Hedgehog]

My '80 CJ5 had a skid plate to hold up the Transmission /Transfer Case . The '75 has a cross member which is a substancial chunk of steel but deffinately not like the skid plate on the '80. The procedure is largely the same.

 

[ThisGuyUKnow]

Im gonna piggy back off this thread cause I have a question that is very related on Transmission mounts for my Nv3550 Swap. Is the torque stud to prevent engine twist necessary? I just hopped on EBay and looked for stock TJ Transmission mount and this is what I found. Dea Ttpa A2882 Transmission Mount | eBay

No torque stud in that one. Do I need to modify my T-176 mount with the torque stud to work? My plan was to just measure and redrill the x-member to match the linked mount. 4.0/Nv3550/Dana 300

::end hijack:: No use in making two threads with similar questions.

 

[Hedgehog]

The mount should be attached to or bolted to the torque arm/stud. On the Jeeps I've worked on the arm is a seperate piece when put together everything makes up the mounting system.

 

[mtnwhlr]

I think it helps take some of the stress off the mount when 4wheeling

 

[Saddle Tramp]

The torque stud helps with the twisting/slapping on acceleration and deceleration which also helps with the longevity of the mounts. On a 1976 and up CJ the torque stud plate bolts between the top of the mount and the bottom of the Transmission . The stud bolts through a hole in the skid plate then the two bushings go on top of and under the large hole in the torque stud plate with the stud holding the bushings in place.