1HDT 80 purchase, advice on gearbox?
Submitted: Thursday, Mar 22, 2007 at 09:48
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93 Navara
Morning all,
Managed to find a 1990 80 1HDT that has had a full reco, turbo and injector pump done. Took it for a squirt to
Canberra, to
Moruya and back down along the Saphire Coast before making it back to
Melbourne. Couldn't have been happier with the car which averaged 11 litres to the 100 km. Definitely a step up from the Navara on the power and comfort stakes. Before we went, had to sort out the driveline slack and replaced the front hubs which made a world of difference to the way it drives.
Only query I have is the state of the gearbox. Change from first to second has to be cautiously done, as if too quick it grinds and kicks back. Happens to alesser degree from second to third. Only occurs when it is cold as after ten or so minutes its pretty smooth. Hoping my synchros aren't on the way out. Anyone had any experience with this, a mate has told me his did the same and he never bothered to address it. Wondering if its an 80 series problem that they all have rather than a gearbox getting too long in the legs.
Have also searched eldorado on the
forum and read most posts. Does anyone know the sidewall ply though as I couldn't find any onfo on that. Looking to put the 285/65's on when these tyres run out. Seem a lot of tyre for the price.
Thanks in advance for your help.
Ben
Reply By: Big Woody - Friday, Mar 23, 2007 at 05:50
Friday, Mar 23, 2007 at 05:50
Hi Ben,
As mentioned above changing the oil will make the world of difference.
My gearbox feels beautiful to use when the oil is warm, it is nice and smooth and dead quiet but that first change to 2nd gear in the morning is very difficult to get it in. Someone above mentioned double-clutching to get it in but with my gearbox this doesn't work.
I get around it just by taking off in 2nd gear first thing in the morning. I have no problems with the 2nd to 3rd gear change when it is cold. As you said once there is a bit of temperature in the gearox oil the problem goes away. It certainly is not something you should be concerned about and it is not an indication that your gearbox or synchros are on the way out. It is a
well known issue and most seem to just live with the problem when it is cold.
I see you have said you replaced your front hubs to help eliminate the drive train backlash issue.
Mine is also a 1990 model with backlash isues. When you say "hubs" does this mean the CV joints are what you replaced? If so did you fit standard CV's or did you upgrade to the post '94 model CV's which are a bit beefier? As I also have a singing front diff I am tempted to just get a complete disk to disk front axle assembly from a post '94 model as this may be cheaper than replacing the CV's and diff centre and would also give me the bigger brakes of the later models at the same time. As i do a lot of heavy towing the bigger brakes would come in handy.
Regards,
Brett
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Reply By: 93 Navara - Sunday, Mar 25, 2007 at 09:03
Sunday, Mar 25, 2007 at 09:03
Big Woody,
We seem to have very similar issues. My mechanic initially thought my drivetrain slack was an issue with the front diff. Soon found out from a friend that pre 94 or 95 it was a problem with the hubs in the AWD models. Apparently the splines on the hubs aren't very 'deep' for want of a better word and wear down over time, causing the slack and the clunk in the driveline. The hubs seem to go first and since
mine have been replaced, it has all but eliminated the issue. If you pull the wheels off, I'm told you will be able to twist the hub to make sure it is your problem. Sorry if I'm a bit vague but I didn't do any of the above myself, it was done by my mechanic when the roadworthy was done.
I saw a week or so ago on ebay, the hubs for sale where the seller goes into depth about the problem, obviously new items. I'm yet to change the oil in the gearbox but will do so and get back to you.
Ben
ps God knows how to change my name, (93 Navara) tried and failed. Think I might have reapply to become a member.
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229563
Follow Up By: 93 Navara - Sunday, Mar 25, 2007 at 09:30
Sunday, Mar 25, 2007 at 09:30
Big Woody,
Jumped on ebay and found the ad. It's the cv joint spline and apparently the replacement have a longer and deeper spline. The seller is at www.the4wdshop.com.au. Not blowing his trumpet, know nothing of the company, just for your info.
Ben
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