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Toyota 70 series overdrive

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Toyota 70 series overdrive

Post by Stingray on Thu 26 Nov 2015, 10:39 pm

I have a great 80 series that I've had for 18 years, but have taken the plunge and bought a 76 Series V8. It is my ex work car and I have driven it from new so couldn't pass it up really. I have taken it away 3 times so far and it has been pretty good out bush (so far touch wood), great on the hwy - heaps of overtaking power etc, but geared way too low - needs a sixth gear.

I've come across this aftermarket overdrive which looks pretty good (notwithstanding the price*?!) and wondered if anyone has or knows someone who has put one in. I'd appreciate your feedback/thoughts.

http://www.marks4wd.com/landcruiser-overdrive/mfk20450.html

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Re: Toyota 70 series overdrive

Post by Wedgetail on Fri 27 Nov 2015, 6:56 am

I dunno much about the 76 series but have you investigated higher ratio diffs? Saves having another gear change and "something else that could go wrong"?



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Re: Toyota 70 series overdrive

Post by oneday on Fri 27 Nov 2015, 7:28 am

what about a different diff ratio.

might be a better option if there's one available.

the ratio should be stamped on the diff from memory..

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Re: Toyota 70 series overdrive

Post by nightjar on Fri 27 Nov 2015, 4:01 pm

Yep! Diff ratio a far cheaper and easier option.


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Re: Toyota 70 series overdrive

Post by topcat on Fri 27 Nov 2015, 7:47 pm

Agree with the others.
When I put a chevy v8 diesel in my 75 series Troopy I had high speed (3.5:1) diffs fitted to give me a better cruising speed at less RPM.

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Re: Toyota 70 series overdrive

Post by Stingray on Fri 27 Nov 2015, 9:03 pm

Thanks for the replies Fellas, I will check out the high ratio diff option.

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Re: Toyota 70 series overdrive

Post by boobook on Sat 28 Nov 2015, 6:19 am

There is a mob in Melbourne: Wholesale Auto. Transmissions (03 97628004) do a 6sp. Toyota tiptronic auto conversion to the 76 series.
Mates with the existing T/C and they claim drops the cruising revs right down.
Looks a well engineered setup and they have an installer in Kal. (name not mentioned)
mike
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Re: Toyota 70 series overdrive

Post by flyrock on Sat 28 Nov 2015, 8:19 pm

I've recently gone from a 80 series to a 76. I found the same with the gearing. I'm now running 285/75/16's (from 265/70's) which has dropped the revs back to 2100 from 2300 @ 100k/hr. The ultra gauge (from the ECU) still thinks I'm doing 2300 though!
Maybe a cheaper fix if you need new tyres. (you maybe even able to get tall 235's? (80%) not sure? that would be a Ray question?)
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Re: Toyota 70 series overdrive

Post by oneday on Tue 01 Dec 2015, 10:43 am

u can get 235/85r16 in a 10ply maybe in a 12 ply Kenda radial tyre.

the 285/75r16 only come in a 8-10ply tyre--for me theres too much tyre waiting to go down.
23% more tyre compared to the skinny and about an extra 3% circumference.

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Re: Toyota 70 series overdrive

Post by Stingray on Tue 01 Dec 2015, 10:34 pm

Thanks again for the tips.

I checked out an auto from the same mob that has the overdrive but that is about $20K. Going to larger diameter 285/75 tyres is a good idea but it currently has 265/75s and although it drives much better than with the 750R16s they come with (they are crap), I am still worried about the width - I'm used to and prefer the 235/85s for general bush/sand/hwy work. The high ratio diff doesn't seem to exist and even so I'm worried that it will be introducing a weak point - others have said that the current diffs are only just OK.

For what it's worth, what attracted me to the overdrive is that according to the specs it is way stronger than needed and hence no weak point (although the shift mechanism is an added potential problem I guess), the back diff doesn't have anymore stress on it, it drops the revs by 18% so less revs= less wear, the 4th high is a good option for towing, you have lower revs without towing in 5th.

The vehicle only has 30K on the clock so hoping it will get me another 300K+ and that will just about do me out. So if, and its a big if, that translates to say 1.5 L/100 km fuel saving then at $1.30/L that is about $2000/100K or $6000 over 300K. Say it costs $9000 fitted then still $3K short. But if you think what a litre of diesel will cost in 5, 10 or15yrs time, plus less wear on motor etc, then it starts to add up. It should add resale value or it could be removed, turning the vehicle back to stock, and put in another 70 series or sold second hand I guess.

I just about talked myself into it - just need to stub my toe on an ugly 7 ounce specie and I'm set!

btw I posted a link to a tyre comparison web page separately.

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Re: Toyota 70 series overdrive

Post by Stingray on Sun 30 Oct 2016, 8:59 pm

I read in saturdays west that the new 70 series have just been released with taller 2nd and 5th gears. I wonder if it is possible and feasible to put the new cogs in the old gearbox - any thoughts?

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Re: Toyota 70 series overdrive

Post by boobook on Mon 31 Oct 2016, 4:46 am

Australian Transmission Components (ATC) have their finger on the pulse when it comes to Toyota drivelines.
Based in Wagga NSW, they also have a Perth branch.
A phone call may assist you here.
Mike
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Re: Toyota 70 series overdrive

Post by Stingray on Mon 31 Oct 2016, 8:15 pm

Thanks Mike - I'll check them out.

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Re: Toyota 70 series overdrive

Post by Stingray on Tue 01 Nov 2016, 9:23 pm

FYI, I called ATC and no joy, they seem to know their stuff but no obvious solution, diffs are already 3.9 so can't go lower, the new cog - too early to say, would void warranty and I don't want to use my vehicle as a guinea pig. Can't find higher profile 235 or even 265 tyres and dont want to go wider - back to the drawing board.

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Re: Toyota 70 series overdrive

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