Differential maintenance after gear swap

I having 3.70's swapped in. I've read the gear break in procedures but no mention of what type of oil to use during that period.

Anyone have suggestions on break in oil and what type to use after the 500 oil change?

you use standard gear oil with posi additive before and after.. i would give it 1000 miles though..

When I spoke to randy ring and pinion they told me you can break them in using 80W gear oil and posi slip lube mixed to the right portions.

I asked about synthetic they said you can break them in with syn, but it was a waste because you needed to dump the oil after 500 miles. So they said to run standard and then after the change they said would be a good time to run syn if you decided to go that way.

Thanks, so no synthetics?

by the way.. if you havent installed it yet.. now would be a GREAT time to add a drain plug..

|UPDATED|9/29/2004 9:28:47 PM (AZT)|/UPDATED|

That's no synth, until After the break in. Then synth is fine, and in fact, a good idea.

How much did it cost? I am considering uping my diff. Did you replace gears or total swap. How's the punch. Was it worth the $$. I have a 1980 with a crate 330 HP.

Hey Relayer44. I just noticed your post.

The best price I found on ring and pinion gears with the install kit was about $300 and $100 for the install from a guy I met at the track. I did get some install quotes from shops in Dallas and they range from $400-$1000!