GQ Gearbox rebuild

Submitted: Thursday, Feb 13, 2003 at 13:58
ThreadID: 3356 Views:1737 Replies:4 FollowUps:5
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Hi all
We are just about to send in our 2.8TD 97 patrol into the shop to get the gear box pulled out and fixed. 1st,2nd,3rd and 5th gear are whinning away. It has got 175,000klm on the clock. The vehicle has been looked after in everyway so we are a bit surprised this job needs doing at this stage. I realise the gearbox in this model is a car gearbox but we don't do a great deal of towing. Is this normal for it to go at this age/stage/milage? Any advise would be appreciated.
Chel
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Reply By: Truckster - Thursday, Feb 13, 2003 at 15:45

Thursday, Feb 13, 2003 at 15:45
Depends on the history of the car... if its been used for towing lots of things, then yes you could expect it.

Have you had it since new?

Havent heard of too many on the patrol list in the 2.8, so little shy on knowledge of them.

You could post there and ask.
AnswerID: 13042

Follow Up By: Chel - Thursday, Feb 13, 2003 at 19:09

Thursday, Feb 13, 2003 at 19:09
Hi Truckster,The vehicle was 18 months old when purchased but we knew the history. No towing. We have used it to tow a camper trailer with a total weight of 1.4ton loaded.We have done two big trips both of 4 weeks duration and a couple of 2-3 day trips.
Chel
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FollowupID: 7641

Reply By: desert - Thursday, Feb 13, 2003 at 16:22

Thursday, Feb 13, 2003 at 16:22
Chel, unfortunately you have picked the Patrol with the worst gearbox. The "weak link" if you would. Certainly they are not suitable for heavy towing. The box is marginal at best. Unfortunately, when fitted behind the diesel engine and also asked to shift along some 2.5 tonnes of 4x4 and gear, it is at best, stressed. The seemed just OK fitted in 3 litre petrol models, but the diesel vibrations seem to further lessen their suitability of service. Some suggestions would be to use a top-quality lubricant such as Penrite with the adition of a friction modifier like Morey's, to cushion the bearing surfaces. Never fit oversize tyres (larger than 31/10.5x15) and perhaps consider an undersize tyre to lessen the gearing and load placed on the box. Of course, this may compromise other requirements like highway revs, ground clearance etc.
AnswerID: 13047

Follow Up By: Chel - Thursday, Feb 13, 2003 at 19:12

Thursday, Feb 13, 2003 at 19:12
Hi Desert, How heavy is heavy towing? We tow a camper trailer with a loaded weight of approx 1.4 ton. We were told to put synthetic oil in to lubricate?
Thanks for your help
Chel
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FollowupID: 7642

Reply By: David - Thursday, Feb 13, 2003 at 20:52

Thursday, Feb 13, 2003 at 20:52
The 4.2 litre GQ gearboxes and other mechanicals are absolutely bullet proof. I have never heard of anybody (who hasn't totally abused it) ever having a problem....
I have a cousin who's on his third Patrol 4.2 who trades 'em in at 400,000 k's and he has never put a spanner to them apart from normal oil & filter changes etc (they have ALL been turbo'd after purchase)
Sorry- I know that doesn't help you....
After your rebuild I would speak to Mobil, BP and anyone else, and buy the absolute best synthetic lube available- Even if it cost a hundred's of dollars for the best oil (it won't be that dear) I'd buy it! Perhaps even a higher viscosity than recommended (might make the synchro rings struggle when the box is cold- but you could always do the old "double de clutch"...)
Good luck!
AnswerID: 13063

Follow Up By: Chel - Friday, Feb 14, 2003 at 11:21

Friday, Feb 14, 2003 at 11:21
Hi David,
All help appreciated. I will look into these synthetic oils some more before next week. I too was hearing all these wonderful stories about not having to touch these vehicles for 400-500000klm. I guess we were the unlucky ones.
Thanks again
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FollowupID: 7661

Reply By: Truckster - Friday, Feb 14, 2003 at 12:45

Friday, Feb 14, 2003 at 12:45
Would a G'box from a 4.2 fit ??

That would be your best bet!
AnswerID: 13105

Follow Up By: Chel - Friday, Feb 14, 2003 at 15:21

Friday, Feb 14, 2003 at 15:21
Truckster HI, I have been told no, but not 100% sure on that. Maybe someone here could help me. Thanks
Chel
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FollowupID: 7669

Follow Up By: Truckster - Saturday, Feb 15, 2003 at 09:17

Saturday, Feb 15, 2003 at 09:17
Chel, jump on the patrol list and ask there.

Im thinking it could be fitted...
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FollowupID: 7718

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