Topic: Opinions on transmission mount

[neale_rs]

These look like they could work:

http://www.4wd.com/Jeep-Lift-Kits-Jeep-Lift-Kits-Suspension/Body-Cab-Mount-Set.aspx?t_c=1&t_s=20&t_pt=6963&t_pn=ENE2.4101G

Or this, which would provide some side to side cushoning, but it's made for a 1/4" plate.  Would 1/4" be good enough?


http://www.energysuspensionparts.com/proddetail.asp?prod=9.4102

[sharpxmen]

the second one

http://www.energysuspensionparts.com/proddetail.asp?prod=9.4102

[neale_rs]

That one looks really good.  Do you think a 1/4" plate would be good enough?  I kind of think so....

[neale_rs]

Have decided to try Jeffy's idea of making a cover for the bolts but made out of HDPE instead of steel. 

My plan is to buy a 1/2" thick cutting board and go from there. 

So how hard is it to cut and shape that material?

[sharpxmen]

you're overthinking it, just replace the bolts with flat head ones, countersink the holes and you can even leave those wedges in. worst case scenario add a 1/4'' plate if you dont have enough room to countersink the holes and weld tack it in place (but i did it on 3/16 plate so it should be enough room in your case since is 1/4'' thick if i remember correctly). if you meet a rock that hdpe cover will be gone anyway.

[neale_rs]

So countersinking into 1/4" would be strong enough?  This would allow me to do this project without involving a shop to do the welding.

[sharpxmen]

So countersinking into 1/4" would be strong enough?  This would allow me to do this project without involving a shop to do the welding.

yes, it would be strong enough, what i don't know is if there's enough thickness to have all the 80deg part in the plate and not sticking out into the mount. I think those are 7/16 bolts in the stock mount
here's a pdf with the dimensions http://www.electroimpact.com/company/QMS-0003.pdf (page 5) - the head is .234 high so if you're careful and don't go below the level of the plate when you countersink it should have enough room to tighten the mount before it bottoms out.

[neale_rs]

Thanks.  That's a very good PDF too.

Ok, so stregthwise it is good but

.234 seems too risky to do by hand drill.  The other thing is that I would need to get this mount:

http://www.4wd.com/Jeep-Drivetrain-Jeep-Axles-Differentials/Polyurethane-Transmission-Mount.aspx?t_c=12&t_s=505&t_pt=3617&t_pn=D%2fI7-1604-BL

so that bolts could be used from the bottom.  The mount in the Jeep now has non-removable studs with nuts under the skid plate.  Since the transmission mount would have to be changed anyway it might be better to go with a pair of these:

http://www.energysuspensionparts.com/proddetail.asp?prod=9.4102

To use these would require .250" spacers anyway  (to duplicate the height of the stock mount) so going too deep on the countersink could be handled by opening up the hole in the spacer.  Overall, getting the spacers welded in as you said might be needed seems like the best way, although I would need to get this done by someone.

[sharpxmen]

if you change the mount it will work, it has a little bit of countersink in it just enought to keep you from worrying. The other ones would work too but you'll have to make the mount really strong (as it extends away from the transmission), they're lot stiffer than the stock mount with very little "give". You can countersink by hand, use a good variable speed drill with the speed setting to low (high torque) - go little by little and check the shape, you can see if you're not centered or off from perpendicular by the shape and make corrections, is not ideal but works ok and it doesnt' have to be perfect.

[neale_rs]

Thanks, that gives me more confidence to do it this way.  I'm going to start gathering the parts and tools.