I was told that running synthetic atf is not recommended is this true and if so why?
I had my tranny built in 2001 and have sence only used B&M trick shift synthetic atf and haven't had one problem with my trans and the person that told me this was suprised

I also change the fluid and filter once a year and now its time for a flush

 

I've used Mobil 1 for years without any problems. The stuff is pretty expensive, though.

 

Pro-built recommends AMMCO says it's really mobil fluid but not synthetic.

 

I use the synthetic in mine with no problems.

 

I run the Redline synthetic and it works fine.

 

Amsoil & Redline are very good synthetics, and I recommend them. Stay away from B&M Trickshift, as it is nothing but reworked Type "F" fluid.

 

Mobil 1, no problems, I did kill two transmissions and 2 torque converters, but I think that was my engine and driving habits that caused the carnage.

 

what do you mean reworked and which trick shift because I've been using the full sythetic with no problems for 3 years

 

I am not aware of the B&M synthetic Trick Shift. I am talking about the non-synthetic that has been around for past 25+ years. I will have to check into the B&M synthetic Trick Shift.

 

I'm running Hurst Hot Shift, and so far it seems fine- fluid was changed 4000 miles ago, and its still clean, no change in tranny behaviour.

tranny is 700R4, engine is LG4, both stock with 131 000 miles.

 

How much thinner is synthetic ATF than regular Dexron III ATF? Is it like synthetic motor oil though in which it is best to run it as early in its life as possible (except the break in period)? I know that using synthetics on an old engine will make the piston rings and valve seals leak, is there a same rule for not using synthetic in an old tranny. I just had my trans built 700 miles ago so I am not worried about, I just was wondering.

Kevin

 

I tried out B&M trick shift; never noticed a difference! In fact it was a pain in the butt- the Trick Shift is blue. Mix that with red trans fluid and you get brown. So every time you check the stick, it looks like your trans fluid is burnt- and on your next trans fluid change, the fluid will still look brown b/c of the residual blue+red mix that's left in the trans. Like I said; a big pain in the butt and a dent in the wallet all for nuthin'.

 

the hurst stuff is red, so i dont have that problem...

 

Synthetic fluid is great for transmissions, it really helps lower tranny temps during extreme operation, normal temp drop on average is 20* which is huge. So long as you dont have any leaks, switching to synthetic is no biggie other than $$$. Alot of other guys run standard hydrauilc fluid like they use in tractors. 0W I beileve. Makes all the parts look nice and new when you goto rebuild and has no ill effects, but many convertor companies will void warranty if they find clear fluid in their convertor if sent back.

 

Can you mix synthetic and regulat ATF?

Kevin

 

yes. all auto trans fluids are compatible. i have 6 quarts of synergen and 2 1/2 type-f(not some kind of trick, i just couldnt find my synergen when i needed a few quarts)

 

yes, just try to get as much old fluid out as possible

 

Why thank you all very much!

Kevin