Autos verse manual trans
- Peter334
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- Outback Jack
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There is a report under the listings for a 4l80e conversion. Think it was around 10k in parts. This was new transmission, GU Patrol Transfer case etc.
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- TH
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I've driven #260 and that feels like it would perform very well in soft sand, not withstanding the 360 odd horsepower up the front .
Saying that, with the 135Ti I don't change gears to often on the open road. Drove to Perth and back (800kms) and didn't drop back from 5th gear once. My concern is slipping the clutch on take off and gear changes in soft sand.
I'll be watching any auto conversions with interest
Cheers, Tony
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- OKABloke
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Your biggest issue with an Allison 1000 or the 4L80e will be the overall length, the Automatics are longer and rear tail shaft angles are likely to be an issue however there are ways around this.
Driving the Auto OKA is fantastic, No stress driving, instant get up and go, and really nice to reverse.
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- Outback Jack
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- Joseph Baz
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Personally I don't believe that a Allison will be good behind a Perkins as the inner workings of the 4L80 and the Allison are different,The 4L80 seems to work quite happily with low power engines better than Allison specially with a paddle shifter when you can dictate the shifting pattern,also the 4L80have the controllers readily available to couple to most engines off the shelf,5speed controllers for A re also readily available and I doubt that a Perkins will hold the 6th gear for any period of time.
All in all I won't be driving a manual 4x4 in the near future.
Cheers,Joe
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- dandjcr
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Joseph Baz wrote: All in all I won't be driving a manual 4x4 in the near future.
Cheers,Joe
Would that that were true Joe.
We drove an old Land Rover series 11A around the world from the UK in the 70's with it's underpowered 4 cylinder engine and manual gear box. Did the job but lack of A/C, no dust-proofing and 80 kph top speed it didn't suit Aussie conditions.
Next was a Discovery series one, 3.5 V8 with a ZF4HP22 4 speed auto box. Fast, powerful, comfortable (but too soft), but very thirsty (worse than our Oka in sand dunes). Very easy to drive but skittish on steep slippery surfaces. We used it for a few outback trips around the country and we've still got it actually, but it's been unused for years (replaced by the Oka) because it's too small to live in although it was good towing workhorse.
It's a feint hope but I don't suppose the ZF4HP22 auto box would fit behind a Perkins? Probably not strong enough, and it needs a lot of revs before it cuts in (2000+), something a Perkins doesn't have.
So I fear we are stuck with a manual box until, as is usual, failure requires an upgrade.
David and Janet Ribbans - Oka 148
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- Outback Jack
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My thoughts is I will be installing a 4l80E, can be had from the States for around 2500 as strenghten unit. This will work behind a Perkins and then when its time to upgrade engine, it will bolt to that as well.
I will use a Nissan Transfer case and Marks adapters
I spoke to Al and he has said that the transmission sits in the same spot with engine conversion.
Just have to find the funds and someone/mechanic willing to do it for me.
Something like this
Extreme Automatics 4L80E Stage 2 Up to 1350HP
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- Peter and Sandra OKA 374
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I wrote the article in the database and the required bits including fitting the Nissan GU transfer case.
I bought a brand new Hummer H1/4wd (heaviest GM version) spec trans here in Oz for $4.5k. I used a Compushift to control it which gives lost of extra's like paddle shift, tow mode and the ability to change shift parameters and torque converter lock up points.
It and the Nissan transfer case totally transform the Oka, much nicer to drive, uses less fuel and now has agreat handbrake to boot.
374's Perky is bog standard apart from the air cleaner mod to get it breathing a bit better, engine & Oka have both done just over 120 k km since new. We've put approx 15k on it since the auto was fitted. The auto allows the Perky to get on boost reaaly well and it pulls like a train right up through the gears, still slows down on hills but nothing like the manual box and by unlocking and locking the torque converter in the lower gears you can split them which makes keeping the engine in its torque band easy. The Hummer spec torque converter works well with the Perky as the peak power and torque figures are at the same rpm as the 6.5 chev V8 diesel. It went really well on its shakedown trip across the Simpson last year with the Oka group and a couple of other Oka owners that have driven it reckon I'm a bastard for letting them have drive ))) Another suggested we swap, wasn't much chance of that happening!!
OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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- Peter and Sandra OKA 374
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I'm also happy to help anyone wishing to do the conversion with any knowledge etc.
Peter
OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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- Peter334
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- Outback Jack
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Cant find the following
Perkins SAE 3 industrial flywheel housing and
Perkins stepped industrial flywheel (used on gensets and pumps)
Havent looked yet for the Trans, Transfer etc.
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- TH
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Cheers, Tony
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- Outback Jack
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- Peter334
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- Peter and Sandra OKA 374
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I got mine from a truck wrecker in SA on one of our trips, put up with it cluttering the floor in the Oka for several weeks and when I got home found the tractor place in town had one set lying around.
There are three SAE housings to suit the Perky's, one for the 4 cylinder (which we want), one for the six cylinder and one for the V8's ( I didn't know there was a V8 Perky either!). Apparently lots of older trucks have the SAE housings but the flywheels are usually only used on industrial engines. I "think" MF tractors have Perkies, don't quote me though.
The local tractor place had them as a result of buying new replacement engines to put in tractors. It is cheaper to buy a fully dressed industrial engine and swap bits to fit in a tractor than buy a long engine. So they had one set in the yard but admitted they had scrapped heaps over the years. The set I got from them has been sold to another Oka owner.
"The Rock" tractor and truck parts down near Wagga has them but is also a bit expensive.
The flywheel I got had only six bolt holes but was easily drilled to take the extra ones our engines have.
OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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- OKA 138
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Cheers Dave
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- Outback Jack
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So if anyone can find S/Hand ones it would be good.
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- Joseph Baz
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Have you tried Wholesale automatics,it may be worth a call
Cheers,Joe
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- Outback Jack
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Thanks for the suggestion, I was talking about the SAE housing and flywheel. I need to search a little harder.
Cheers
Lobo
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