Trans temp high
Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
What are you changing out? Our tranny's hold about 18 quarts plus enough to flush.
Thread Starter
|
More Turbo
Joined: Dec 2004
Posts: 527
Likes: 6
From: Jamestown Tn
after i installed the 6.0 cooler i went to the ford dealer to get more merc 3 they said they now only have merc 5 and it says on the bottle semi synth, which the 3 did not, so it was changed. dealer told me they were on to mix, so i did. but im going back to reg anyways. at least my temp issue was resolved .. jeff
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Motorcraft Merc V is semi syn. I'm running Mobil1 Merc V which is full syn, and it works great!
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
Senior User
Joined: Nov 2003
Posts: 423
Likes: 0
From: Providence, RI
A leak in the in-radiator tranny cooler will make the fluid pink. If it's not a clear deep red, then something is wrong. You might also check for signs of ATF in your radiator-fluid.
You can bypass that in-radiator tranny-cooler and flush the fluid, and then see if the problem reappears.
You can bypass that in-radiator tranny-cooler and flush the fluid, and then see if the problem reappears.
Thread Starter
|
More Turbo
Joined: Dec 2004
Posts: 527
Likes: 6
From: Jamestown Tn
i do believe i have a guage related problem. my guage went right to 130 on a cold start, so i suspect the guage is bad. I called Diesel manor where i got it from and he also said it sounded bad because it bounced around to 160 in 5 miles then went back to 140. So i suspect this is the problem. And when i left for work this am it must have been 130 then went to 190 so sounds to me like the tranny temp guage is wacky. i sure hope so. but BTS suggested changing out the merc 5 mixture i have to reg merc 3 for my tranny. so thats in the plan as well. thanks jeff
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
FYI, there is no "Merc III", just Mercon. I know it's confusing, because of the Dexron III/Mercon rated fluid...
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread Starter
|
More Turbo
Joined: Dec 2004
Posts: 527
Likes: 6
From: Jamestown Tn
Well i took BTS advice and Im gonna go that route. I just bought penzoil atf to replace merc 3. I sorta have my own custom blend in there now 8 qts mec 5 and rest was dextron 3 so i will change it all out.
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
i do believe i have a guage related problem. my guage went right to 130 on a cold start, so i suspect the guage is bad. I called Diesel manor where i got it from and he also said it sounded bad because it bounced around to 160 in 5 miles then went back to 140. So i suspect this is the problem. And when i left for work this am it must have been 130 then went to 190 so sounds to me like the tranny temp guage is wacky.
Check your ground wire to the gauge. If you can, reroute the ground wire to another source. Sure sounds like a grounding issue.
Thread Starter
|
More Turbo
Joined: Dec 2004
Posts: 527
Likes: 6
From: Jamestown Tn
well im sure its the gauge now because when I went home from work the truck was stone cold, and as soon as I started the truck up it went to 130. then 3 miles down the road it jumped to 160, 5 miles later it bounced back to 130 and never moved again. I think its fried... they are sending me a new one free (warranty)and its sure is a lot eaiser fix than having a tranny problem....
Thanks for all the responses out there, this is a great place for info Jeff
Thanks for all the responses out there, this is a great place for info Jeff
Thread
Thread Starter
Forum
Replies
Last Post
slinginsaws
1987 - 1996 F150 & Larger F-Series Trucks
5
Oct 28, 2014 04:12 PM