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  #1  
Old November 8th, 2014, 04:57 PM
Spanish Fly
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Carlos Soldevila
1990 Defender 90
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Defender transmission issue

I own a 1990 Defender 90

I've started having problems shifting into second gear when the engine is cold. (The other gears shift great all the time.)

For the first five minutes of a day's first drive, I have a hard time engaging second gear and there is a grinding noise (gear not engaging) when I try to shift into second. Once I get rolling, it shifts perfectly for the rest of the day.

I did change the oil in the transmission (75w 90 synth), and I am not sure but I think it coincides with the problem -but it is also coincides with the weather getting colder outside, so, I I'm not sure which is the cause, if any!.

any advice out there?

tks in advance
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  #2  
Old November 8th, 2014, 05:00 PM
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Viton
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Are you sure the trany takes gear oil ?
Some manual transmissions actually use ATF.
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  #3  
Old November 8th, 2014, 05:06 PM
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Quote:
Originally Posted by Spanish Fly View Post
I own a 1990 Defender 90

I've started having problems shifting into second gear when the engine is cold. (The other gears shift great all the time.)

For the first five minutes of a day's first drive, I have a hard time engaging second gear and there is a grinding noise (gear not engaging) when I try to shift into second. Once I get rolling, it shifts perfectly for the rest of the day.

I did change the oil in the transmission (75w 90 synth), and I am not sure but I think it coincides with the problem -but it is also coincides with the weather getting colder outside, so, I I'm not sure which is the cause, if any!.

any advice out there?

tks in advance
75w90 is transfer case lube. Try redline mtl, royal purples synchomax or similar. Thicker oil makes it harder for the synchro's to align.
There is a pump of sorts inside the trans to lubricate crucial parts and thick oil doesn't work well with that either.
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  #4  
Old November 8th, 2014, 05:08 PM
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You need ATF in this gearbox!
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  #5  
Old November 8th, 2014, 05:12 PM
Spanish Fly
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Carlos Soldevila
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thanks!

I changed all the fluids at once and did use 75w 90 synth for the transfer case...
Did I make a mistake for the tranny?... really seems like it!
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  #6  
Old November 8th, 2014, 05:15 PM
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if you put 75w90 in it you did
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  #7  
Old November 8th, 2014, 06:47 PM
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redline mtl, pennzoil synchromesh, or honda mtf. i've used all three and all work fine.

your synchros are going to have a problem running 90w for sure.
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  #8  
Old November 22nd, 2014, 03:20 PM
Spanish Fly
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Carlos Soldevila
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Quote:
Originally Posted by Arlo View Post
You need ATF in this gearbox!
Replaced the oil by ATF: problem solved!
Thanks for the help.
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  #9  
Old November 22nd, 2014, 04:41 PM
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  #10  
Old November 22nd, 2014, 08:09 PM
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I have the exact same issue from 1st to 2nd and I just thought it was characteristic of the 1994 transmission which I believed on NAS versions they changed to a new transmission in 1995. So are you saying automatic transmission fluid will help with this? If so what brand is recommended? My 1994 5 speed has always done exactly what Spanish Fly was experiencing.
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  #11  
Old November 22nd, 2014, 08:13 PM
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everybody says that the transmission is hard from 1st to second. I think they might be confusing the extreme low range of 1st gear and the less than german synchronization. Heck the old 4 speeds loved to shift out of second all by themselves
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  #12  
Old November 22nd, 2014, 08:51 PM
Spanish Fly
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Carlos Soldevila
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Quote:
Originally Posted by wmatos1001 View Post
I have the exact same issue from 1st to 2nd and I just thought it was characteristic of the 1994 transmission which I believed on NAS versions they changed to a new transmission in 1995. So are you saying automatic transmission fluid will help with this? If so what brand is recommended? My 1994 5 speed has always done exactly what Spanish Fly was experiencing.
this is what I've put : CAM2 Dexron-VI Multi-Vehicle Full Synthetic ATF
shifting into second gear is now a charm, even on a "very" cold Canadian start.
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