4.8 GRX auto concerns

Transmissions, Transfer Boxes, Axles, Drive Shafts
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pgreeff
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4.8 GRX auto concerns

Post by pgreeff » 29 Sep 2018 16:43

Last weekend I towed a two ton trailer loaded to the brim with garden refuse and noticed after some time of heavy towing in traffic there was some flaring between gears one and two between about 2200 rpm and 2600 rpm. It also seems to only happen at around the same throttle position. At other revs it doesn't seem to happen or perhaps I just don't notice it. It flares about 200 rpm and drops into gear and seems to get worse the harder it is has worked.

I've since been able to replicate this a few times when it is really hot out. I need to drive like a maniac, presumably to heat things up thoroughly, before this will start to happen.

Considering the background of the car I fear the worst but hope there are some possibilities, read civilised possibilities, other than a gearbox replacement or rebuild that I should look into first.

Some things to consider.
1. The oil is fresh and filter is clean and new. Fluid level is fine. I replaced it all when I purchased the car.
2. Engine has been replaced. A history of abuse and poor maintenance was apparent at this point.
3. Gearbox oil was ugly when I got it. I didn't get a burnt smell, but I don't know what burnt ATF smells like. A number of oil changes (Matic J from Nissan before you get all excited) were made till it was clean and the filter is new.
4. The radiator is brand new and was replaced with the engine.
5. When the car is cold gear shifts are quick and smooth. Possibly the thinning of the oil causes problems when it heats up. Could also be valve body somewhere.

Any ideas?
2004 Nissan Patrol 4.8
2006 Nissan Hardbody 2.4 D/C 4x4

Picasso
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Re: 4.8 GRX auto concerns

Post by Picasso » 29 Sep 2018 18:54

seeing that you live in centurion...... take it to Gtech :salute:

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Peter Connan
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Re: 4.8 GRX auto concerns

Post by Peter Connan » 30 Sep 2018 06:36

Considering the symptons, i suspect it is tied to gearbox oil temperature.

Maybe consider adding a gearbox oil cooler?
Mag ons ons kenniskry met lekkerkry aanhoukry.

pgreeff
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Re: 4.8 GRX auto concerns

Post by pgreeff » 30 Sep 2018 18:51

I had the same thought Peter. The oil cooler on the Patrol is embarrassingly small. I phoned around for a radiator place in and around Centurion that will fit a larger oil cooler but no one seems to do oil coolers, just radiators. As soon as I can find a place a big puppy will be installed. I am worried that there is a bigger underlying problem. I get the impression these boxes either work or they're broken.

If no joy I will have to contact the professionals.
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hugejp
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Re: 4.8 GRX auto concerns

Post by hugejp » 30 Sep 2018 20:36

http://hot4cold.co.za/contact-us/

Universal Coolers in Centurion
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Tinus lotz
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Re: 4.8 GRX auto concerns

Post by Tinus lotz » 01 Oct 2018 08:53

Om te meet is om te weet...sit n temp sender op pyp voor en check eers reverse flow op die cooler en kyk of hy nie vol modder is na jou rus de winter trippie nie...ek het nog nooit olie temp problems met n 4.8 gehad nie

pgreeff
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Re: 4.8 GRX auto concerns

Post by pgreeff » 23 Nov 2018 18:04

So I've been driving the Patrol on and off as and when it was necessary. The flaring doesn't seem to get worse or better. Radiator bypass has no effect. I don't think it is a cooling problem, but rather, and unfortunately, a gearbox problem.

Does anyone know of a specialist for these gearboxes that I can see for a diagnostic?
2004 Nissan Patrol 4.8
2006 Nissan Hardbody 2.4 D/C 4x4

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hugejp
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Re: 4.8 GRX auto concerns

Post by hugejp » 24 Nov 2018 00:17

All-O-Matic in selby have rebuild sevices & specific kits for the Re5 box.
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hugejp
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Re: 4.8 GRX auto concerns

Post by hugejp » 24 Nov 2018 00:18

Ask for Braam.

:thumbup:
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