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  #1  
Old March 27th, 2009, 09:23 AM
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Tyler
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Transmission oddity

I have an odd problem with the 380 in the rover. If I don't shift from 1st to 2nd at about 2k rpm the thing grinds. All other gears are fine. It only grinds though going up when I shift from 2nd to 1st no issues at all. Anyone got any ideas?
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  #2  
Old March 27th, 2009, 09:42 AM
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Paul Beckwith
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Its do do with the syncro in the box - common fault - Ashcrofts in the UK fit different, stronger components when rebuilding them..............

Paul
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  #3  
Old March 27th, 2009, 09:48 AM
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Don Bunnell
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My R380 does the same thing and has for the last year I've owned it. I just shift into neutral really quick before into 2nd and will deal with it until I need to replace the clutch and then will swap the gearbox.
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  #4  
Old March 27th, 2009, 09:53 AM
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syncro, are you using the Redline MTL?
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  #5  
Old March 27th, 2009, 11:32 AM
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Robert Lynch
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seems common -

In mine..... mine potentially grinds from 1-2 and 2-3 if your not careful.

Switch to Redline MTL (it made a difference, although not as earth shattering as i would have liked)
Shift consistantly from 1-2, not fast and not slow.
Match your Rev's when shifting, the engine tends to fall below the next gears revs pretty quickly (it has a lot of heavy moving parts and a heavy flywheel) this does 1/2 of the syncro's job for it.

just try altering your technique basically before getting a new gear box.

i'll also be fitting a new gear box down the road but in reality there is no hurry to do so, it can wait until i do the engine
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  #6  
Old March 27th, 2009, 11:45 AM
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Shift slower.
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  #7  
Old March 27th, 2009, 12:52 PM
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Have Redline I need to get the torx bit to remove the fill plug and I'm golden.
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Can't you feel 'em circlin' (closin'in) honey?
Can't you feel 'em swimmin' around?
You got fins to the left, fins to the right,
and you're the only bait in town.
You got fins to the left, fins to the right,
and you're the only girl in town.

Jimmy Buffett


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  #8  
Old March 27th, 2009, 01:13 PM
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I would think most parts stores would have it, Ive seen them at the NAPA from time to time.
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  #9  
Old March 27th, 2009, 01:30 PM
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mines an lt77 not a 380 but it will grind between 1/2 and 2/3 if you don't shift it just right. At first I was dbl de-clutching but I have a bad left knee so that got old fast. Of late I've found a better way to do it. On the first half of clutch pedal movement I take it into neutral and then on the 2nd half of the pedal's swing i put it smoothly into the higher gear. This all has to be done as one smooth motion.

It also shifts much better after a few miles when everything is warmed up. And yes this is with MTL. Didn't make much of a difference over the ATF for me. Maybe it shifts better sooner but when its cold it seems the same.

I think whoever said the engine falls below ideal shifting rpm too quickly probably has it right. None of that is a problem if you have good synchros or know how to doule clutch.
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  #10  
Old March 27th, 2009, 04:02 PM
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Daniel Marcello
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shift slower. I know a lot of people that shift way to fast. I think they do this thinking the more force and speed the easier it will get into gear. I am super slow when i shift. Like a truck driver does. We basically are driving trucks/farm equipment.

I usually go from 1st, to neutral to 2nd in 1.5 second. make sure you feel neutral. don't linger on it, but feel the notch - then down to 2nd. care for your tranny and it will run fine.

One other thing, I was looking for lightened flywheels. does anyone in the UK make them?
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  #11  
Old March 27th, 2009, 04:48 PM
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Quote:
Originally Posted by ini88
shift slower. I know a lot of people that shift way to fast. I think they do this thinking the more force and speed the easier it will get into gear. I am super slow when i shift. Like a truck driver does. We basically are driving trucks/farm equipment.

I usually go from 1st, to neutral to 2nd in 1.5 second. make sure you feel neutral. don't linger on it, but feel the notch - then down to 2nd. care for your tranny and it will run fine.

One other thing, I was looking for lightened flywheels. does anyone in the UK make them?

Why a lighter flywheel? seems like good for high revving engines in sports cars but wouldnt a heavy flywheel be good in a 4x4?
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  #12  
Old March 27th, 2009, 04:52 PM
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My red D90 had no second syncho left. I was able to shift smoothly at any rpm or speed by timing it.

Ron
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  #13  
Old March 27th, 2009, 06:23 PM
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Robert Lynch
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in a Defender you would want a heavy flywheel - something that can take the stress of crawling etc at low RPM's fully engaged, the torque, etc.

I have a light weight flywheel in my porsch 964 Cup car, it will stall if you sneeze wrong (with the race gas chip in it) it is not meant for low RPM off idle work.
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  #14  
Old March 27th, 2009, 06:43 PM
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I always thought a light flywheel would be better in a racecar or an offroad truck. It does make sense that the heavier it is the easy it is to roatate the clutch to roll the wheels.
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  #15  
Old March 27th, 2009, 07:10 PM
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yep both of those applications are high RPM uses, where a light weight Flywheel yeilds its advanatges (quicker reving engine, less parastic drag, etc)
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  #16  
Old March 28th, 2009, 09:10 AM
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Well I do shift slower now but every once in a while i forget. So if i want to fix this I need to order a reman from Ashcroft? Sad that this sounds like a common problem.
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Can't you feel 'em circlin' (closin'in) honey?
Can't you feel 'em swimmin' around?
You got fins to the left, fins to the right,
and you're the only bait in town.
You got fins to the left, fins to the right,
and you're the only girl in town.

Jimmy Buffett


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  #17  
Old March 29th, 2009, 12:35 AM
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You could just replace the second synchro. The ones I looked at (3 or 4) all needed the whole hub in addition to the brass? synchros.
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  #18  
Old March 29th, 2009, 06:16 PM
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I've thought about that. Frankly I'm a little pissed that the 2 R380s I've had in here have both failed in someway after about a year or so. The LT77 that was original lasted for over 120k before failing. At the moment money won't allow another replacement so maybe replacing the synchro is an option or I guess shifting slowly too.
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Can't you feel 'em circlin' (closin'in) honey?
Can't you feel 'em swimmin' around?
You got fins to the left, fins to the right,
and you're the only bait in town.
You got fins to the left, fins to the right,
and you're the only girl in town.

Jimmy Buffett


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  #19  
Old March 29th, 2009, 07:02 PM
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Quote:
Originally Posted by flippedrover
I've thought about that. Frankly I'm a little pissed that the 2 R380s I've had in here have both failed in someway after about a year or so. The LT77 that was original lasted for over 120k before failing. At the moment money won't allow another replacement so maybe replacing the synchro is an option or I guess shifting slowly too.

How many miles on your truck? Where did you source the R380's?
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  #20  
Old March 29th, 2009, 11:23 PM
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Quote:
Originally Posted by flippedrover
I've thought about that. Frankly I'm a little pissed that the 2 R380s I've had in here have both failed in someway after about a year or so. The LT77 that was original lasted for over 120k before failing. At the moment money won't allow another replacement so maybe replacing the synchro is an option or I guess shifting slowly too.
That is most likely attributable to your driving style. Shift slowly and it will last forever.
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