1st to 2nd grind only when cold??? - JeepForum.com

 
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post #1 of 10 Old 12-24-2007, 12:42 PM Thread Starter
Mitchell1789
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1st to 2nd grind only when cold???

Ok, so first off, what I think is cold is around 40-50 degrees. Only when I haven't driven my jeep for a few hours at least, I go to shift from 1st to 2nd gear and it grinds a little bit going in to second. HOWEVER, I have avoided this grinding by double-clutching 1st to 2nd. Now after about 2 minutes of driving, it shifts perfectly and smoothly as if it was a brand new transmission. When it's warm outside, it doesn't EVER grind any gears... Anybody have any ideas as to what could cause this?



Thanks!
Mitch


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post #2 of 10 Old 12-24-2007, 12:51 PM
Matt Gertsch
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It's pretty common for that to happen. There is a TSB out on it, but I've never read it. IIRC, a lot of people have solved the problem by using a high quality synthetic fluid like Redline.

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post #3 of 10 Old 12-24-2007, 01:21 PM
toates89
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anyone know what weight i should use for my 89 5speed
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post #4 of 10 Old 12-24-2007, 05:37 PM Thread Starter
Mitchell1789
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Quote:
Originally Posted by Matt Gertsch
It's pretty common for that to happen. There is a TSB out on it, but I've never read it. IIRC, a lot of people have solved the problem by using a high quality synthetic fluid like Redline.


Matt, apologies for being a NOOB but IIRC? TSB? Is a tsb like a synchro?
~Mitch

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post #5 of 10 Old 12-24-2007, 05:48 PM
Timo_90xj
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IIRC = if I remember correctly
TSB = technical service bulletin (or something like that??), sort of a recall, but not exactly.

..guess how long it took me to learn all this internet jargon, especially 'cause my mother language is not English


Anyways, a lot of higher- mileage manual trannys do that, not only on Jeeps but many many others. Usually there's nothing to really worry about it, as you knowhow to double-clutch, you propably know thjis already, but:
a cold tranny/ cold fluid, the synchro rings don't fully function and that's why you get grinding, and that's usually just 1st to 2nd (and sometimes 2nd to 1st as well if you use engine-braking).

Like mentioned, use high-quality fully- synthetic oil and it should reduce that grinding to minimum

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post #6 of 10 Old 12-24-2007, 06:54 PM Thread Starter
Mitchell1789
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Quote:
Originally Posted by Timo_90xj
IIRC = if I remember correctly
TSB = technical service bulletin (or something like that??), sort of a recall, but not exactly.

..guess how long it took me to learn all this internet jargon, especially 'cause my mother language is not English


Anyways, a lot of higher- mileage manual trannys do that, not only on Jeeps but many many others. Usually there's nothing to really worry about it, as you knowhow to double-clutch, you propably know thjis already, but:
a cold tranny/ cold fluid, the synchro rings don't fully function and that's why you get grinding, and that's usually just 1st to 2nd (and sometimes 2nd to 1st as well if you use engine-braking).

Like mentioned, use high-quality fully- synthetic oil and it should reduce that grinding to minimum

Ok, so Ill put some nice synthetic in it. Yeah, someday I'll learn the jargon around here... But anyways thanks a ton for your help! Happy holidays!

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post #7 of 10 Old 12-24-2007, 07:05 PM
Timo_90xj
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No worries

..sorry for the spelling errors, after staying awake for ~18 hours and drinking a few beers after that isn't good for your eyesight

Happy holidays too

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #8 of 10 Old 12-24-2007, 08:46 PM
Grand Fan 4eva
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had the same problem when it would get to about -10 or -20 around here. read up on it and switched to redline mt-90. it's much smoother now. still catches a little but its definitely better. i'd recommend it. i ordered mine from summit racing.

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post #9 of 10 Old 12-25-2007, 10:16 AM Thread Starter
Mitchell1789
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Quote:
Originally Posted by Grand Fan 4eva
had the same problem when it would get to about -10 or -20 around here. read up on it and switched to redline mt-90. it's much smoother now. still catches a little but its definitely better. i'd recommend it. i ordered mine from summit racing.

Ok, I'll go with that. Sounds pretty good. How many quarts does it take?

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post #10 of 10 Old 12-26-2007, 03:08 AM
Lew360
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Here is a good write up on changing the oil in an AX-15. He used MTL but I prefer MT-90, especially in warmer climates. Some of the information is TJ specific but you will get the idea.
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