Went under the knife this morning. Be ready later today or tomorrow morning. With what I saw(and posted pics somewhere) few months back when changing great oil, I knew I was on borrowed time. Let alone, pulling the toyhauler to mammoth in 2wks... So, I'm having them install 4.10....... Ask you SoCal kats, she's at Unitrax, here in Placentia

 

I'm sure you will love it. I had a truck re-geared and then pulled a toy hauler half way across the country.

I would highly recommend you get at least 500 miles of driving on the gears. Then do a 50 mile tow with the trailer and then dump the oil and put in fresh oil before doing any serious towing.

 

I couldn't imagine not having 4.10 gears, but I tow about 80%of the time.

 

to funny.. This companys' reputation proceeds them, and that's exactly what he said. Drive her for 50 miles with 20-25min intervals allowing the gears to get hot and cool. Afterwards, ain't tow until 500 miles. I'm hitting the river next weekend, prior to mammoth, so there's my break in. I'll ask about the fluid change...

 

They will probably say it is not needed. But for less then 50 bucks, I'd rather have new gears (after break-in) bathing in some fresh oil!

I also recommend after the 500 miles you hook the trailer up and do a quick 50 miles and then let it cool. That will finish off the break in process.

 

Roger that!....

 

Night and day! Only assy Sherman pass and a few other steep climbs, I was in 6th the whole time, let alone, can pull the gear when approaching a hill and/or staying in it on flats...BADARSE! best 12 bones ever spent