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2000bluexj
February 14th, 2010, 08:37
I have a 2000 cherokee and just bought a new Trans Mount. My old nuts look like they are 5/16-18 however the new studs look like they are 5/16-24 fine thread. Can i just use a regular nut on it, or do I need a flange nut like the factory one?

Apostle
February 14th, 2010, 08:49
you can use a regular nut, but would also add a lock washer and reg washer.

been a while since i looked at it, but think factory is the self locker type

2000bluexj
February 14th, 2010, 08:59
It seems impossible to get a washer up there with the crossmember

Apostle
February 14th, 2010, 09:01
try a bit of grease. slips, but also acts as a soft glue: nut/grease/lock/grease/washer

2000bluexj
February 14th, 2010, 11:26
I may just tack weld a washer onto a nut.

2000bluexj
February 14th, 2010, 12:38
The original threads are M8X1.25. My mount, although the correct part number, is 5/16X24. I need to swap this one with another at the parts store. And I cannot find 5/16-24 anywhere around here.

Brown Dog
February 15th, 2010, 10:48
How did you determine the bolts supplied are 5/16-24? M8-1.25 is very close to 5/16-24. It would be easy to get them mixed up. 24 thread is the common fine thread on a 5/16" bolt (source Mathinery's Handbook). However, since the M8-1.25 is commonly used on Jeep of all kinds, I'd substitute with the spec bolt: M8-1.25. Might try NAPA or a good Ace Hardware for the correct bolt. While you're there, ask for an all-metal lock nut. Jeep used a locking nut on the original. Use a washer with it since the flange nuts are difficult to locate. As with all lock-nuts, tighten snug, but no more (there are not torque specifications for lock nuts because of the way a lock nut works). Never reuse a locknut.

This wouldn't be the first time we've seen a manufacturer send 5/16 instead of M8...the 5/16 are cheaper and more readily available on the wholesale market.

joe_peters
February 15th, 2010, 14:24
Thinking the four studs through the crossmember are M8-1.25 as mentioned by the others. I used lock washers with nyloc nuts on mine.

2000bluexj
February 15th, 2010, 19:33
I found some flange nuts,non locking. Ill just use some red loctite on them