Fluid type

[Backfoot100]

Hey guy's.
Been reading and searching but to no avail.
I have an 86 Sub 2WD w/700R4. Its got 125k miles that I just got running good enough to start driving.
Truck overall is in really nice shape. Runs and drives good after a good quality carb rebuild. Shifts good. Tranny fluid is a clear red color.

My question is what's your take on synthetic vs. standard dino Dexron tranny fluid with this unit?

I like synthetics and would probably do a complete fluid flush with synthetic but I also understand the huge controversy over that vs. a drain and fill. I'll start with a drain/fill after changing the filter and see what that does.

I'm looking at the future to see if its even an option with these 700R4's. I know some older trannys that were designed to be run with conventional dino fluid respond really well to synthetics and others not so much.

Looking for your opinions.

Thanks in advance.

 

[Crispy]

I've never ran anything except for factory spec on my trannies. I'm also of the school of thought that says if its been running on dino oil for 125k then it can keep running on it. If it were a fresh rebuild or a new car's first fluid change then I would opt for the synthetic. I say spend the $ on something else.

 

[Honky Kong jr]

I run Type F in my TH400s and TH350s nice clean shifts is the only byproduct

 

[HotRodPC]

I just don't think I'd go with a synthetic trans fluid unless it was required. Especially not in a 125,000 mile transmission. I really doubt it has 125,000 miles on the transmission though. Most 700r4's don't make it that long. Some do though so it could be but not likely. Being 700r4 is another reason I wouldn't use synthetic.

 

[Charlie]