[6spdRT]

2010 RT with 6 manual transmission. . What Trans fluid do you guys recommend? I've read some like royal purple synchromesh and amsoil synthetic. Any preferences and did it actually smooth out the Trans. Sometimes I noticed mine is hesitant to go into gear.

 

[chizzle1]

I have been happy with the RP Synchromesh. Make sure you get the pump kit to add the new fluid.
Mine seems a little less notchy then with the stock ATF. Specially between 1-2.

 

[TikiMan]

I've been a Royal Purple user for many years and love the product. You will get various responses based on individual preferences here.

 

[chizzle1]

Change the rear diff fluid also. I changed mine at 25k and it was nasty.
RP makes gear oil with the friction modified for the limited slip blended in, and it will dissapate heat better than the stock gear oil.

 

[cdahl383]

Which RP product did you use Chizzle? I need to do this myself in the spring.

 

[chizzle1]

Which RP product did you use Chizzle? I need to do this myself in the spring.

For the rear I used RP Max Gear 75-90.

here is the thread from when I changed mine.
http://www.challengerforumz.com/showthread.php?t=104958

 

[6spdRT]

How many quarts does the limited slip rear end take?

 

[chizzle1]

How many quarts does the limited slip rear end take?

I completely emptied 1 bottle, and most of the second. I think it's just under 2 quarts.
I over filled it slightly to allow for fluid to work it's way into the LSD assembly.