• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

2nd gear grinding only when warm?

  • Thread starter Thread starter saleen9973
  • Start date Start date Oct 27, 2007

saleen9973

Member
Aug 5, 2001
54
0
6
Oct 27, 2007
#1
  • Oct 27, 2007
  • #1
Hey guys my t5 has a problem. I just put royal purple atf in my t5, when the tranny is cold it shifts fine. But when it warms up it grinds and it grind very bad if i try to shift at higher rpm's. Do you think i need to adjust the clutch and change the fluid to regulat dex/mec fluid? The guy i bought it from said he had put 75/90 gear fluid in it and ran it for a few hundred miles, i know that you shouldnt run gear oil so i changed it to royal purple but it shifts bad now. With the gear oil it had no problems.
 

SuperStang83

Founding Member
Mar 21, 2001
1,693
0
49
Boyertown, Pa
Oct 27, 2007
#2
  • Oct 27, 2007
  • #2
I would go back to ATF and if it still does this I would try and replace the syncros before you need to totally rebuild it.
 

saleen9973

Member
Aug 5, 2001
54
0
6
Oct 27, 2007
#3
  • Oct 27, 2007
  • #3
i am gonna try regular atf, i think the royal purple is too thin when it gets hot. Anyone else have this type of problem?
 

baldy1

New Member
May 5, 2005
124
0
0
Portsmouth Va
Oct 27, 2007
#4
  • Oct 27, 2007
  • #4
He pt gear oil in to hide a problem. The syncros and or the gear and or the slider could be bad. Fix it now before you cause more damage. Amsoil works real well in the T5. No gear oil. The royal purple ATF is regular ATF with purple dye in it. Its nothing special. Trust me I know this
 

fastford91

New Member
Aug 15, 2006
254
1
0
Niagara ,Ontario, Canada
Oct 27, 2007
#5
  • Oct 27, 2007
  • #5
never put gear oil in it you wont even be able to shift it!! all you need is ATF! of any kind synthetic or non!
 

bloopbloob

Member
Sep 27, 2006
578
4
16
Alberta
Oct 27, 2007
#6
  • Oct 27, 2007
  • #6
baldy1 said:
He pt gear oil in to hide a problem. The syncros and or the gear and or the slider could be bad. Fix it now before you cause more damage. Amsoil works real well in the T5. No gear oil. The royal purple ATF is regular ATF with purple dye in it. Its nothing special. Trust me I know this
Click to expand...


+1. The gear oil was no accident. Maybe try putting some sawdust in there. Heard it works wonders
 

PUNISHER RACING

Active Member
Aug 27, 2007
1,124
0
36
FORD CITY, PA.
Oct 27, 2007
#7
  • Oct 27, 2007
  • #7
+1 on the ghetto patch job get a synchro kit and switch your fluid to BG Synchromax or a good Syn. Mercon
 

saleen9973

Member
Aug 5, 2001
54
0
6
Oct 28, 2007
#8
  • Oct 28, 2007
  • #8
I guess the gear oil is heavier so it sticks to the scyncros right?that would not make them clash as bad. That makes sense. Well i guess its time to do a rebuild. I have the normal bolt ons and i am adding a set of ported e7's and a ported explorer intake in the spring. I dont want this t5 to go again any time soon what are my best bets? Should i upgrade gears and if so how expensive are they? I will be shifting 2nd very hard and going to the strip often next year. I am tight on cash would a regular rebuild hold up? thanks.
 

PUNISHER RACING

Active Member
Aug 27, 2007
1,124
0
36
FORD CITY, PA.
Oct 28, 2007
#9
  • Oct 28, 2007
  • #9
Call Astro Performance they sell a 350/400 T5 combo that runs about the cost of a rebuild at a local trans shop. They make a good product.
 
You must log in or register to reply here.

Similar threads

S
Drivetrain Downshifting from 3rd to 2nd issue
  • Scott_S
  • Apr 23, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
626
Fox 5.0 Mustang Tech Jun 14, 2026
Mindseye007
Drivetrain How much resistance, if any at all, is normal on a new 1st gear and synchro on a WC T5 transmission?
  • sleep-e
  • Jan 21, 2026
  • Fox 5.0 Mustang Tech
Replies
2
Views
212
Fox 5.0 Mustang Tech Jan 22, 2026
sleep-e
M
85 Capri 5.0 transmission rattle
  • Mamaclean
  • May 2, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
119
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 17, 2026
Mamaclean
M
C
Trans issues.
  • ChrisCruz1972
  • Aug 13, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
8
Views
306
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 8, 2026
slow84lx
S
T5 5th gear 89 gt
  • mac_55
  • Mar 19, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
175
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 20, 2026
Mustang5L5
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang 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?