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Old November 6th, 2005, 05:39 PM
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Martin Spencer
1994 D-90
Join Date: Sep 2005
Location: Graford, TX, USA
Posts: 268

I know most of you are probly sick of hearing my questions, but I've got another one. Is the LT77 transmission terrible? It seems lots of people have put the R380 in the older 94s. What is wrong with the LT77? Should I pass on a purchase oprotunity because of the transmision. This will be a daily driver. Any help and advice will be greatly appreciated.

thank you,


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Old November 6th, 2005, 06:08 PM
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Hans Haase
The Lab Rat
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,385
I personally, I haven't had any issues with the LT-77. The only REAL annoyance is that the reverse gear is in an odd location. Some of the earlier ones did have troubles with premature wear on the output shafts, which is the only thing I would be concerned with. There are ways to check for that, but I don't remember the details (should be able to search for it in the forums somehow)


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Old November 6th, 2005, 06:47 PM
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Doug Walker
TVR5L-powered NAS D-110
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
The output shaft wear could be an issue. Search for method of determining wear, it's pretty easy and is evidenced by play in the driveline. 115,000 on mine and still no major play. 77s shift hard and the syncho gets weak in 2nd and 3rd (I always have to pause going into 3rd).

380s are the solution. Of course you could get a Quaffe 6 speed sequential bolt-in replacement -- that is if money is no object!!

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Old November 6th, 2005, 07:20 PM
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Chris Davis
94 D90, 88 RRC
Join Date: Nov 2003
Location: Colorado
Posts: 2,106
My 77 is fine. I did not have the cross drilled output shaft, but I did put a reoiler kit on it at about 65K miles. Every 380 that I know of has synchro issues, so do 77's but no worse. I would not pass up an opportunity if it had a 77, but when I replace mine it will be with a 380 because I can get them cheaper. Of course I might just rebuild my 77...
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Old November 8th, 2005, 04:39 PM
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Mike Hammond
110 200Tdi and a 2005 Scorpa SY250
Join Date: Oct 2003
Location: Oxted, Surrey, England, U.K
Posts: 1,753
With a cross drilled gear on the output shaft wear is greatly reduced. All my trucks have LT77's and the worst one to drive is the one rebuilt by Ashcroft for much money.
Mike Hammond
Diesels.....great when they're going and so easy to work on.
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