My first post! Great forum by the way! Didn't find the answer I was looking for as mine was pretty specific so I thought I should rack some brains.
Long Story Short.
I bought my 02 Dodge Ram 1500 SLT in June 2011 from a friend.
When purchased it was a well maintained higher mileage vehicle. 300,000km (186k Miles)
Whenever I buy a new (to me) vehicle my first priority is a Haynes Manual, adding zerk fittings anywhere I can and changing any fluid I see fit. Oil, power steering, brakes etc....
Without even thinking about it or even referring to the repair manual I changed the transmission fluid. Dropped the pan, replaced the sump screen, replaced the secondary internal filer and gasket. Filled her with Dexron III
Since the change (310,000km) I have put on just shy of 8,000km. Towed two skidoo's 3000km return loaded with guys and gear for ice fishing.
After this long trip I decided it was time to change the rear differential/front differential, 4x4 transfer case fluid and change the oil.
That's when I realized reading through the Haynes Manual I obviously put in the wrong transmission fluid. Should have been ATF +4 or equivalent.
After my realization I started to piece together a glitch I've had since the change. Unless the truck is up to normal operating temperature final overdrive did not activate. Once she was warm (some city driving) I would easily find final overdrive and sit comfortably at 2,000 rpm at 100kph. Otherwise at a cold start and run I would sit at 2500rpm until she was warm. Once she was warm the gear would activate. The shift was so subtle you wouldn't even know she shifted (So it's not like it was shifting hard or banging into gear).
This Monday upon realizing what I had done, I immediately changed the fluid to ATF +4.
During the change I noticed NO abnormal wear, NO burned fluid, NO significant amount of metal build up or even a metal sheen in the fluid. It still had good consistency and was lubricated well. Only thing that threw me off was there was no scent in the dexron whatsoever.
This upcoming Monday I will be doing a secondary change, this time changing the sump, filter and gasket and of course changing the fluid again.
Did I get away with a major screw up? Have I shortened the life of my transmission? Do you think the final overdrive issue will resolve itself or is unrelated? Should I reset the computer after the final changes?
Just to head off any questions that may be simple ones. I had no warning lights, transmission temp was normal. I literally only had this final overdrive issue (Which was easily resolved by driving the truck to warm her up before highway use)
Yes, I know I'm an idiot for not referring to the manual before I did the work. Please don't remind me of that.
Any input would be greatly appreciated.
Thanks in advance