r154 hard to shift when hot

[di_rosa]

as the title says, car drives perfect when cold, but after about 30 minutes of driving, it will be hard to shift, especially into 1st (from a stop).

things i have checked/done:

-adjusted clutch pedal to have more travel (release clutch more)
-verified tranny fluid level is good


it is really starting to get annoying when i get stuck in rush hour traffic. my next idea was to change the tranny fluid to some redline, but i have synthetic in there right now that i never had a problem with when i used it in my other tranny a few years back.

i was guessing MAYBE the clutch disc is not sliding on the input shaft anymore, and once the disc/flywheel/pp material warms up and expands, it's like i'm not releasing the clutch enough cause it's partially grabbing. only reason i think that is because i have adjusted the clutch already, and the car (if on perfectly level smooth ground) will kinda move forward a bit when i try to put it into first (like when the disc is in backwards).

 

[Poodles]

You said you have synthetic in it now, but all synthetics are NOT the same and many contain friction modifiers that will make it worse...

 

[RedGT]

I would try bleeding the clutch. You may have air in the system, or your clutch master cylinder may be going bad.

 

[di_rosa]

replaced the master 2 months ago.

and yeah, i know about the friction modifiers, but would it get worse with temperature?

 

[jdub]

With heat expansion, would not surprise me.

 

[Jeff Lange]

Thread Moved.

Jeff

 

[di_rosa]

sorry jeff, i thought this fell under technical

jdub, so you're saying you would agree, it's the clutch disc no sliding on the input shaft?

 

[jdub]

More so a synchro problem...worn most likely and a gear oil with friction modifiers in it will make it worse. Synchro's need some friction to function properly...worn + slippery oil = hard to get in gear. Thermal expansion will just magnify the situation.

Another thing to look at is the shifter seat bushing.

 

[di_rosa]

yeah, my shifter bushings are hurting, but i didn't think they were affected by heat.........i've been meaning to order a set from DM.

ok, i'll throw in some redline, and order up those bushings from DM now.

 

[jdub]

I like the Marlin Crawler poly bushings...they have a nice shifter end bushing too.

 

[Jeff Lange]

sorry jeff, i thought this fell under technical

It is not engine-related, therefore cannot be classified as 7M-GTE technical.

Jeff

 

[Poodles]

I like the Marlin Crawler poly bushings...they have a nice shifter end bushing too.

driftmotion sells the marlin crawler bushings, and if they keep them in stock you'll know you're getting the right price and Aaron will be faster...

 

[Zumtizzle]

Green Truck Bushing > MC Bushing.

Both feel the same but the Green is cheaper.

 

[Poodles]

Bull, as my marlin crawler bushing is out of my old truck, so it's a good 5+ years old and it's still tight.

 

[di_rosa]

ok, so after 300km's of this super expensive Royal Purple oil, and new Marlin Crawler shifter bushings, i am still having the same damn issue.

any other ideas?

 

[jdub]

Royal Purple is not one of the oils to use in these trannys

 

[di_rosa]

ah, are you fucking serious? every thread i have read said this Royal Purple works wonders in the r154, and is even better than Redline MT-90? man, i just spent $108 on this shit...............unbelievable.

ok Jdub, so i guess you're saying i should drain it, and try some redline?



edit: you know, it's kind of funny. the royal purple gear oil everyone was saying was better than mt-90 says it has the lsd additives in it and i was like wtf, i thought that was bad for trannys, but i guess if everyone is saying it helps with 1-2 shift, and 3-2 shift, and other little problems, i should try it.

 

[Poodles]

Take it from someone that's tried em all (normal gear oil, royal purple max gear, royal purple syncromesh, redline MT-90), go with the MT-90...

 

[Alec]

I agree with MT-90. I had MTL in there previously but my bushings were worn. I replaced both bushings and put in MT-90 and it shifts great!

 

[jdub]

ah, are you fucking serious? every thread i have read said this Royal Purple works wonders in the r154, and is even better than Redline MT-90? man, i just spent $108 on this shit...............unbelievable.

ok Jdub, so i guess you're saying i should drain it, and try some redline?

edit: you know, it's kind of funny. the royal purple gear oil everyone was saying was better than mt-90 says it has the lsd additives in it and i was like wtf, i thought that was bad for trannys, but i guess if everyone is saying it helps with 1-2 shift, and 3-2 shift, and other little problems, i should try it.

Must be on SF

That is correct, RP has friction modifiers in it...not good for a R154.