My new Marlin Crawler W56-C Heavy Duty transmission is having trouble shifting in gears.

First ill go through the history... I have put about 2,500 miles on it so far. I ran full synthetic oil for 1,000 miles, and then drained it and put some more synthetic in. (not sure what brand, should have asked the shop)

Now for the details... The transmission is having trouble getting into first after coming to a stop. Then when shifting into the other gears (while accelerating) it always seems to clunk in. Third gear is the worst, it feels as if it's grinding in, even though there is no noise (once or twice it has actually made a grinding noise). What I mean by "feels as of it's grinding in" is that the stick feels like it clunks in two to three times before fully engaged. It always requires quiet a bit of force as well. Also note that these are not quick shifts and the clutch is always fully depressed. I have tried double clutching, letting the RPMs lower, raising the RPMs, everything.

Is this by chance a clutch problem? Kinda annoys me because even my old crappy transmission slid into gear better then my MC transmission. Is it because it's heavy duty? Also note that I'm defiantly NOT HATING ON MARLIN CRAWLER, they are an awesome company and I love their products and customer service. I will be buying a lot of stuff from them in the future. I just want to figure out what's going on with my new $2,000 transmission! (thought I'd ask you folks before I harassed the Marlin Crawler crew)

Any help would be great! Thanks!

 

Clutch bracket crack or fatigue.

Seriously doubt it's your tranny.

Did you not put in a new clutch/flywheel/master and slave with your new tranny?

:wabbit2:

 

Call Marlin Crawler. They will ask some common installation questions then help you narrow down your trans issues.

 

Put in a new flywheel, clutch, and slave. Is this crack/fatigue easy to spot?

 

Look under your dash at the pedal assembly and depress the clutch. These are known for cracking and the whole assembly will flex when you push the clutch pedal in. I would have to say it has something to do with your clutch. Did you replace your slave or master cylinder?

 

Replaced the slave cylinder. I needed and oil change so i'm having Toyota check out my clutch assembly. Seems like these guys always have an excuse to "test drive" my truck... We'll see what they say about it.

 

They said the problem was bad fluid in my slave and master cylinder.. So this weekend I'll be doing that. But they cracked my air box housing or something because it's now making a new noise that doesn't sound healthy. Went back and they pulled the "oh that's normal, it may be new, but it's normal!"

Dumb...People.



Anyone know what this noise is? The air sucking sound..

Edit: video isn't posting, so here's a link..
http://i1181.photobucket.com/albums/...e/4d477231.mp4

 

Bad fluid?
Never let then touch your truck again.

Check the pedal assy and just call Marlin if that's not it.

:wabbit2:

 

Break-In Procedure:

Please note that it may take between 5,000 - 10,000 miles for your new synchros to break in. It is natural for a brand new transmission to feel stiff and rigid to shift. This stiffness will need to be worked out through a process of many miles and shifts. Remember that your transmission is designed by Toyota to work for over 200,000 miles, so a break-in period of 10,000 miles should not concern you. It is STRONGLY RECOMMENDED that you use mineral GL5 80-90 weight gear oil during this break-in process. Synthetic gear oil is NOT recommended during the first 10,000 miles because in some cases it's advanced lubrication can prevent proper synchro break-in.

I have about the same miles on my MC W56B standard tranny, still a little stiff as well.

 

Normal for it to grind into gear? Also was the mineral GL5 80-90 gear oil recommended by Marlin? Thanks for the post man

 

The clutch assembly looks fine, so I need to give Marlin a call. Thanks for the help man

 

My quote was from Marlin's own website, under their Tech section, and under Transmission Installation Instructions. Yes, they do recommend the MINERAL GL5 80-90. I called and asked about this and they said synthetic should be OK, as long as it's good stuff. I have synthetic in mine, because that's what the installer went with and is in Toyota's specs. I'll change it out after a couple oil changes. I don't know about grinding into gear, Mine doesn't grind, but does take some effort at times to shift.

 

As in grind i mean a slight chip, happens very rarely. Although, i'm glad to hear that the stiff shifting is normal!

 

DO NOT use GL-5 in the transmission! The synchros will not work properly...you need to use GL-4.

 

Ditto on the gl-4, gl-5 will eat brass over time.