Phil G Old cruiser gearboxes

Submitted: Tuesday, Mar 10, 2009 at 20:37
ThreadID: 66710 Views:1365 Replies:5 FollowUps:4
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Well I suspected my old dearbox was getting worn, no tell tails just a gut feeling.

The box has done lots of Klms so I can't complain, especially as it has the 6.5 in front of it and it is used for towing

lots of worn bits and dollars.

What I would like to know, is there anyway of reducing the wear after the box is reconditioned. I'm not hard on the box, so I am looking at the lube side of things. Transfer is fine and I don't tow in 5th unless it is easy going.
All genuine parts will be used in the recon.

Have a good one, if you can't blame someone else

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Reply By: Rockape - Tuesday, Mar 10, 2009 at 20:42

Tuesday, Mar 10, 2009 at 20:42
Missed the point, box is a 89 that hada 2H boat anchor in front of it.
AnswerID: 353294

Reply By: PeterInSa - Tuesday, Mar 10, 2009 at 21:23

Tuesday, Mar 10, 2009 at 21:23
I use Nulon in Gearbox, TCase, diffs and engine, believe it helps. Vehicle has had Valvoline oils since new. Dearer oils maybe better and may not need Nulon (may contain the same suff).

Peter
AnswerID: 353303

Follow Up By: Rockape - Wednesday, Mar 11, 2009 at 07:11

Wednesday, Mar 11, 2009 at 07:11
Pete,

I know of others who use Nulon so thanks.

Have a good one
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FollowupID: 621490

Reply By: SteveD - Tuesday, Mar 10, 2009 at 22:18

Tuesday, Mar 10, 2009 at 22:18
Phil
My view as a diesel mechanic is if its not broken don't fix it, by that I mean if its not making noise, not generating metal and operating ok, I would leave it alone. With oils, years ago I was working for tour operator and due to the loads and heat in a harsh environment on Cape York we ran 80W90 in the gearbox and 85/140 in the transfer case ( Landcruiser Troopys and Arkanas). However for normal Joe I would simply stick to manufactures recommendations. Keep oils clean, keep water out and maybe elevate breathers up under the bonnet. Oil is cheap prepared to repairs so if in doubt, change the oil out.
Cheers
Steve
AnswerID: 353317

Follow Up By: Rockape - Wednesday, Mar 11, 2009 at 07:09

Wednesday, Mar 11, 2009 at 07:09
Steve,
the box does need attention, case hardening worn through on shafts and 5th gear.

Thanks for your reply.

Have a good one
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FollowupID: 621489

Reply By: Member - Phil G (SA) - Tuesday, Mar 10, 2009 at 22:44

Tuesday, Mar 10, 2009 at 22:44
Rockape,
No magic suggestions. I guess theres the odd downside to having 6.5 litres under the bonnet when the gearbox is made for a 76Kw motor. But the vehicle is 20 years old. If its any consolation, the gearbox that came in the early 78series was not as good as yours!

Steve's comments above are sensible.
AnswerID: 353327

Follow Up By: Rockape - Wednesday, Mar 11, 2009 at 07:15

Wednesday, Mar 11, 2009 at 07:15
Phil,
thanks for your input, I asked for your advice as you seem to know cruisers inside out.

Have a good one
0
FollowupID: 621491

Follow Up By: Rockape - Saturday, Mar 21, 2009 at 08:37

Saturday, Mar 21, 2009 at 08:37
Phil,
just letting you know that the box showed no signs of damage from having the large engine in front. It was just plain worn after 20 years. This is despite being used alot in the scrub and towing a 1.5 tonne van

Input shaft through case hardening, 5th gear through case hardening. Transfer case was like new.

Input shaft was replaced, 5th gear on main shaft replaced, 5th gear on counter replaced and counter shaft replaced and all bearings right through.

just adding that I respect any advice you give as you sure know your way around cruisers.


Have a good one
0
FollowupID: 623300

Reply By: Member - John and Val W (ACT) - Wednesday, Mar 11, 2009 at 07:59

Wednesday, Mar 11, 2009 at 07:59
Have just had our gearbox (and 3F motor) rebuilt as you propose - had done 350,000+kms. Very happy with the result.
J and V
"Not everything that can be counted counts, and not everything that counts can be counted."
- Albert Einstein

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