Gearboxes for Troopies 78 series

Submitted: Thursday, Apr 30, 2009 at 18:48
ThreadID: 68389 Views:6527 Replies:3 FollowUps:9
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I've been stumped by Toyota!! decided to change the Gearbox and Transfer case oils and so consulted the Gregorys and Ellerys workshop manual re quanities and type of oils reguired. Ellerys told me little other than quanities ie 70 series 4.9 litres for the gearbox and 2.7 for transmission ditto for the Gregorys but gave me the gradeof oil needed SAE 90. So of Up go and purchase a total of 7.5 litres of Penrite oil, dump the old oil from both unit then proceed to fill the gearbox first..pumping away then suddenly oil starts overflowing....what the! almost 3.0 litres put in Hmm clean up the spill and ponder the problem anyway decide my troopy does not have the H55f box as suggested... check the compliance plate and of course I have a R151 gearbox Hmm check Gergorys again, no R151 gearbox exists only H150F & H151F both for 80 series.. So I work it out that yes I put 2.7 litres of oil in gearbox that's consistant with the H150F/1F boxes So does anyone know what a R151 box is?? Its a Oct/99 build 1HZ non Turbo I've owned it since 2002 with 68K on the ODO ex Police Rescue Vehicle any clues anyone??
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Reply By: Member - Nick (TAS) - Thursday, Apr 30, 2009 at 19:36

Thursday, Apr 30, 2009 at 19:36
The R151 is the weak link in Toyota boxes and is found behind 1HZ engines in the 105 series and others.Driven well, they preform ok but do have 2nd and 5th gear problems, especially if a turbo has been fitted.
Castrol VMX80M is the best oil for these boxes.
AnswerID: 362483

Follow Up By: Member - Trouper (NSW) - Thursday, Apr 30, 2009 at 19:41

Thursday, Apr 30, 2009 at 19:41
Gee thanks Nic for the good news!!

Jeff
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Follow Up By: Member - Nick (TAS) - Thursday, Apr 30, 2009 at 19:49

Thursday, Apr 30, 2009 at 19:49
I change my gear box oil every 12 months useing VMX80M and never slog the engine/gbox.
I tow a camper(about 750kgs) and will tow in 5th on flat easy going but usually 4th.Even when not towing and hit a hill/rise, I knock it back to 4th.
If or when the box fails, I will convert over to a H151 which is alot stronger and purpose built 5 speeder.
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FollowupID: 630201

Follow Up By: toyotabits.com - Friday, May 01, 2009 at 07:06

Friday, May 01, 2009 at 07:06
G'day Nick, is there anyway you can tell visually which gearbox I would have behind my 1HZ? The engine/transmission has been a transplant from another model, not sure what, thanks, aussiedingo
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Follow Up By: Member - Nick (TAS) - Friday, May 01, 2009 at 07:54

Friday, May 01, 2009 at 07:54
I dont know of a way, Im guessing there maybe a ID plate on the box.Maybe have a TD 100 series beside yours and roll back and forwards under them comparing.
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Reply By: Member - ross m (WA) - Thursday, Apr 30, 2009 at 19:38

Thursday, Apr 30, 2009 at 19:38
You dont have to measure the oil before you pour it in,you just fill to the filler hole and its full.
The filler hole is the full mark to stop it from being overfilled(on level ground).
I double checked the factory manual and it says 3 litres ; )
AnswerID: 362484

Follow Up By: Member - Trouper (NSW) - Thursday, Apr 30, 2009 at 19:45

Thursday, Apr 30, 2009 at 19:45
Thanks Ross

When you expect to put in 5.0 odd litres but can only fit in 3.0 its a bit of a surprise.... besides it was the box type that concerned me in particular

Cheers
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Follow Up By: Member - ross m (WA) - Thursday, Apr 30, 2009 at 20:26

Thursday, Apr 30, 2009 at 20:26
I think the R151 iis supposed to give less resistance to improve the fuel economy.This is probably because it has less oil to spin around.
The gearshift is suppose to give it a more modern feel.
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Follow Up By: Member - Barnray (NSW) - Thursday, Apr 30, 2009 at 21:23

Thursday, Apr 30, 2009 at 21:23
You are probably a victim of a Government purchasing Dept which will downgrade a vehicle to their own specs or price and or Toyota doing the same.Barnray
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Reply By: Member - Phil G (SA) - Thursday, Apr 30, 2009 at 22:37

Thursday, Apr 30, 2009 at 22:37
78series never had the H55F box. R151F were pretty common and are found in the Prados, Hiluxes and behind the 1Hz in the 78/79/105 series. They were OK if you treated them kindly. In your model there was a problem with breaking the shaft between gearbox and transfer with loss of drive - Toyota fixed it by upgrading the shaft.

You've got the wrong Gregorys - you must have the #513.
The #520 covers 78/79/100series and has a section on the R151F box.
AnswerID: 362522

Follow Up By: Member - Trouper (NSW) - Friday, May 01, 2009 at 17:37

Friday, May 01, 2009 at 17:37
Phil

your spot on, I do have the Gregorys 513. Although it does say on the front. Troop Carrier
70 series
75 series
1990-1999

80 series
1990-Feb 1998

4.2Litre (1HZ)

Thanks for that will buy the 520 tomorrow

Regards

Jeff (Jervis Bay) NSW
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Follow Up By: get outmore - Saturday, May 02, 2009 at 03:46

Saturday, May 02, 2009 at 03:46
yep wrong book
as you said it covers 70 and 75 series NOT 78-79 series which took over in 99
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