• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Dextron 5 in c4 after rebuild?

  • Thread starter Thread starter garystocker
  • Start date Start date Apr 26, 2011

garystocker

Member
Jan 2, 2005
305
0
17
New Jersey
Apr 26, 2011
#1
  • Apr 26, 2011
  • #1
I ask the garage performing a rebuild on my C4 if the fluid would remain type F and they replied that for longevity reasons they will be using dexron 5. I have heard of dextron II or III fluid being used in rebuilds before but I have never heard of Dexron 5.

Isn't that fluid synthetic? Can i use synthetic fluids in an old ford tranny even newly rebuilt? I thought Mercon was made for Fords, not Dexron?

Have you heard of this being used in C4's before?

If the tranny can work and last on that stuff I am told it has better heat dissipation properties and the addition of friction modifiers which will preserve the clutches.

Sound accurate to you?
 

brianj5600

Active Member
Sep 19, 2003
1,964
2
39
Middle TN
Apr 26, 2011
#2
  • Apr 26, 2011
  • #2
You might be surprised what will work in a C4. Mine has 0-20w Mobil1 motor oil. A more common fluid is John Deere highgaurd.
 

blown65

Founding Member
Jul 7, 1999
1,938
4
39
Queen Creek Arizona
Apr 27, 2011
#3
  • Apr 27, 2011
  • #3
PA recommends Dextron also, so that's what I used.
 

Wicked65

Member
Aug 10, 2003
490
3
19
NORCAL
Apr 27, 2011
#4
  • Apr 27, 2011
  • #4
blown65 said:
PA recommends Dextron also, so that's what I used.
Click to expand...

The Dextron 5??
 

brianj5600

Active Member
Sep 19, 2003
1,964
2
39
Middle TN
Apr 27, 2011
#5
  • Apr 27, 2011
  • #5
The fluid you use has a lot to do with what friction plates are used. Friction modifiers usually mean something added to smooth out shifts.
 

blown65

Founding Member
Jul 7, 1999
1,938
4
39
Queen Creek Arizona
Apr 28, 2011
#6
  • Apr 28, 2011
  • #6
May not be 5. Missed that part. I believe its dex4 I'm running but gotta look.
 

rbohm

Founding Member
Apr 12, 2002
6,698
550
204
tucson,az
Apr 28, 2011
#7
  • Apr 28, 2011
  • #7
in the old days, dexron lll was used in many ford transmissions for those that wanted a slightly softer shift.
 
You must log in or register to reply here.

Similar threads

A
2001 Mustang GT, scorched metal smell and noise from trans/diff?
  • AndyE2255
  • Dec 1, 2025
  • SN95 4.6L Mustang Tech
Replies
4
Views
434
SN95 4.6L Mustang Tech Dec 28, 2025
gkomo
S
Requesting Guidance for 306 motor swap - Fuel? - SD? MAF?
  • So_Flo
  • Jul 26, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
32
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 4, 2026
Mcmahst
SOLD SOLD!!!! 1993 Notchback Roadracer For Sale. She's a beast!
  • Boydster
  • Apr 25, 2025
  • Fox Body Mustangs For Sale (1979-93)
Replies
0
Views
1K
Fox Body Mustangs For Sale (1979-93) Apr 25, 2025
Boydster
S
Drivetrain 8.8 Pinion and 302 rear main seal leaks after replacing. 93 5.0 with t-5
  • Steigy4827
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
10
Views
641
Fox 5.0 Mustang Tech Apr 1, 2026
Steigy4827
S
Drivetrain Should I change fluid in G Force T-5 after initial 500-1000 miles?
  • skiwesser11
  • Jan 31, 2022
  • Fox 5.0 Mustang Tech
Replies
1
Views
904
Fox 5.0 Mustang Tech Jan 31, 2022
skiwesser11
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?