rb25det tranny grind

[r33pilot]

this just started the other day. always when cold the tranny would grind going into second unti it warmed up. now it grinds going into fourth when i downshift or go from 3rd to 4th. its not bad but it bugs me. i just changed the fluid about a month ago, so its full. i never drove it much until recently so i cannt say if it was doing it before i changed the fluid. any ideas let me know, thanks.

[DJDANGER24]

what fluid did you use on the transmission before and after ?

[str4g63]

from what i hear its normal, every rb ive driven does it.. either when cold or the 4th.. mine does it both times and I have a twin plate, I was reading about it on nico. I used standerd fluid going to try better stuff soon see if it help. red-line and royal purple was recomended.

[DJDANGER24]

here is what i use:

Synthetic Manual Transmission and Transaxle Gear Lube 75W-90 API GL-4 (MTG) (http://www.amsoil.com/storefront/mtg.aspx)

When i changed the fluid last year, i had no grinding issues.

If you change your fluid and it still has issues with it grinding, might want to look into changing out your syncro rings

[r33pilot]

i dont know what was in the tranny when i got it, but i put mobil 1 75-90 in it when i changed it. i think im gonna try changing to better fluid like royal purple or something comprable. hopefully better fluid will help.

[s13xturbo]

yea, use heavier oil. It should help

[r33pilot]

are you talking heavier weight than 75w-90? or just a better fully synthetic oil? im gonna try it this week coming up.

[Sileighty_85]

from what i hear its normal, every rb ive driven does it.. either when cold or the 4th.. mine does it both times and I have a twin plate, I was reading about it on nico. I used standerd fluid going to try better stuff soon see if it help. red-line and royal purple was recomended.

Royal Purple Gear oil is garbage,

That shit killed my old SR tranny, grinded in 2nd and 4th, changed it out to some Mobile 1, Helped out alot but the damage was already done.

And a friend of mine his KA tranny grinded in every gear with RP, swapped out to some mobile 1, No more grinding

[r33pilot]

alright i changed the fluid the other day to redline 75w/90 and its smooth as can be. only once in awhile it does it going into 4th, usually at higher speeds while downshifting. big improvement though.

[gijoe69]

Get the gearbox rebuilt bearing with synchro kit

[fliprayzin240sx]

Royal Purple Gear oil is garbage,

That shit killed my old SR tranny, grinded in 2nd and 4th, changed it out to some Mobile 1, Helped out alot but the damage was already done.

And a friend of mine his KA tranny grinded in every gear with RP, swapped out to some mobile 1, No more grinding

Same here...Never ever put a GL-5 tranny oil into SR trannies. They dont like GL-5s, ONLY GL-4 oils.

I made sure I only run GL-4 oil on my RB25 tranny.