rebuilding 4-speed...what transmission fluid?
05-03-2004, 03:38 PM
#1
Intermediate
Thread Starter
rebuilding 4-speed...what transmission fluid?
rebuilding 4speed...what transmission fluid?
thinking about getting royal purple...anyone have recommendations?
thinking about getting royal purple...anyone have recommendations?
05-03-2004, 04:22 PM
#2
Race Director
Member Since: Mar 2001
Location: Living in the Hartland
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Re: rebuilding 4-speed...what transmission fluid? (79corvetteTPI)
I used Mobile 1 syn gear oil, I did not rebuild but the trans seemed to shift a little easier just from the syn oil.
05-03-2004, 04:25 PM
#3
Tech Contributor
Re: rebuilding 4-speed...what transmission fluid? (79corvetteTPI)
I use 90 wt gear oil
Gary
Gary
05-03-2004, 05:15 PM
#4
Burning Brakes
Re: rebuilding 4-speed...what transmission fluid? (gtr1999)
When I rebuilt my Muncie, I was told by the rebuilder who sold me the kit never to use synthetic in a Muncie. Dino oil only. I use 80w90 gear oil in mine.
05-03-2004, 07:20 PM
#7
Melting Slicks
Member Since: Oct 2000
Location: TEXASTEXASTEXASTEXAS TEXASTEXASTEXASTEXAS
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St. Jude Contributor
Re: rebuilding 4-speed...what transmission fluid? (BEBOP138)
So did either of you ask your rebuilder why? I also use Mobile 1 & find that it makes shifting smoother.
JB
JB
05-03-2004, 07:49 PM
#8
Race Director
Re: rebuilding 4-speed...what transmission fluid? (JB)
JB,
Many trans rebuilders (including NASCAR trans guru Tex Powell) think that synthetic is TOO slippery and doesn`t cling to the synchros. (And yes I am aware trannys with "synchronizers" are no longer used in the top levels of NASCAR). I use synthetic in mine but I have one of those funny trannys without synchros... ...redvetracr
Many trans rebuilders (including NASCAR trans guru Tex Powell) think that synthetic is TOO slippery and doesn`t cling to the synchros. (And yes I am aware trannys with "synchronizers" are no longer used in the top levels of NASCAR). I use synthetic in mine but I have one of those funny trannys without synchros... ...redvetracr
05-03-2004, 07:56 PM
#9
Le Mans Master
Re: rebuilding 4-speed...what transmission fluid? (redvetracr)
When I serviced mine (MuncieM-20) I filled it with sae 145W and I could not shift it when it was cold. I went back to valvoline sae90w. It shifts very easy and is quiet...Check out http://www.5speeds.com for some good info
05-03-2004, 11:55 PM
#10
Melting Slicks
Re: rebuilding 4-speed...what transmission fluid? (79corvetteTPI)
Vaveline 80/90 Dino / mineral oil.
Shifts OK. I am curious though, if it would shift better with synthetic oil.
:cheers:
Shifts OK. I am curious though, if it would shift better with synthetic oil.
:cheers:
05-04-2004, 12:23 PM
#12
Le Mans Master
Re: rebuilding 4-speed...what transmission fluid? (PureSilver)
Torco is very good lube, they sell re-labeled bottles to Richmond for their brand of lube. Synergyn is also good, use high quality lube if you are running M22 gears, DO NOT use Sta Lube for M22, you'll destroy it!
05-04-2004, 03:49 PM
#14
Le Mans Master
Re: rebuilding 4-speed...what transmission fluid? (79corvetteTPI)
I use Mobil 1 in both my T-10's (one is in a '70 Nova). They shift much easier and smoother than they did with the old dino oil. I have at least 40K miles on the Vette T-10 with synthetic and have had no problems.
