IIA autobox advice

[dkfrizzell]

OK.. first off, I am at work and bored thinking about some plans I have for the 2a, so I figured I'd mosey on over to DWeb and see what opinions I might garner from people smarter than I am...

Last weekend I was given a very good 89 RR rolling chassis. I have been wanting to go coil in my 2a for a while now, so I figured this was as good a time as any.

Since technically this is my wife's truck, she asked if I could make it an automatic while I already have it apart already. Currently the driveline is all stock rover except for a Peugeot 2.5TD engine mated to the IIA gearbox.

Some ideas to go auto I have come up with include:

1. Use a ZF auto from a Peugeot sedan that will bolt right up to the diesel, then use a divorced transfer case from a Samurai

or

2. Use a ZF auto from a Peugeot sedan that will bolt right up to the diesel, then make an adaptor to bolt a LR LT-230 transfer case to the tailshaft of the Peugeots tranny.

or

3. Use a ZF auto from a Disco (complete with the LR LT-230 transfer case) and make a new adapter to bolt it up to the Peugeot diesel.


Since I will now have RR axles with CVs and not Ujoints, the all-wheel-drive transfercase doesn't concern me. I also know that I will need some custom driveshafts, engine/trans mounts, re-route exhaust, etc. My only real concern is that I would prefer a setup where I can keep a tall road gear yet a small 1st low. The tall gears in the RR diffs and taller gears in the autobox shouldn't be a problem for the diesel, but I would like to keep some kind of crawl ability when off road.

Comments anyone?

Thanks,
Dave

 

[KevinNY]

Does the Puegot leave you room to move the drivetrain forward a few inches to keep your rear shaft angles workable?

Does the pug have enough umph to loose with the slushbox?

An LT230 lo reduction is 3.32:1 vs the 2.89 in your IIa tcase, you could use your 4.70 diffs to get your gearing down but that affects your Hi as well of course. The divorced tcase with the puegot auto built with the correct shift point would seem the best bet. Damn lot of tinkering to get it all to work though.

I have spare axles, CVs and hubs for an '89 if you need them.

 

[Ron]

I would think the only workable option would be a ZF out of a disco Tdi. Personally, I would leave the drivetrain as is. Diesel + auto = SLOW

Ron

 

[landrovered]

Just a thought...

Can you use the bellhousing from the Peugot ZF on the Disco ZF + LT 230?

 

[dkfrizzell]

Does the Puegot leave you room to move the drivetrain forward a few inches to keep your rear shaft angles workable?

is forward as far as it can go. but I am considering pushing the rear axle back just a bit to make the wheelbase 94" like a D90. Should help get rid of that damn overhang on the tub, give me a better DS length, and a better pinion angle.

Does the pug have enough umph to loose with the slushbox?

95hp and 154lbs torque

An LT230 lo reduction is 3.32:1 vs the 2.89 in your IIa tcase, you could use your 4.70 diffs to get your gearing down but that affects your Hi as well of course. The divorced tcase with the puegot auto built with the correct shift point would seem the best bet. Damn lot of tinkering to get it all to work though.

so RR axles w/ 4.7 R&Ps and the LT230... ya that may get me in the correct range if I am too high.

I have spare axles, CVs and hubs for an '89 if you need them.

Thanks kevin.. i'll geep you in mind when I start breaking stuff

 

[dkfrizzell]

I would think the only workable option would be a ZF out of a disco Tdi. Personally, I would leave the drivetrain as is. Diesel + auto = SLOW

Ron

Well, its not your normal Rover diesel... it does have lots of umph. The problem is that my power comes on at 2250 rmp (with a red line not much higher) and with the current gearing that leaves me a top speed of 55 with a Fairey OD! But hey, I can sure get up to speed quick hehe.

 

[dkfrizzell]

Just a thought...

Can you use the bellhousing from the Peugot ZF on the Disco ZF + LT 230?

That is a good thought... except I don't have a spare Pug ZF or LR ZF laying around to experiment with.

One of the main reasons why I want to make sure I am making an infomed decision before I leap, 'cause it could get expensive if I am wrong :banghead:

 

[KevinNY]

Isn't a 90's wheelbase 92.5"? Mine is 87" but I use a CV rear shaft and it's a coiler so I can tip my pinion up with shorther links.

 

[dkfrizzell]

Man.. i thought my wife was being picky about an extra 1.5"

Its probably 92.5.. I was just going by what I heard/read on the intarweb (so it must be true?)

 

[Ron]

"Well, its not your normal Rover diesel... it does have lots of umph. The problem is that my power comes on at 2250 rmp (with a red line not much higher) and with the current gearing that leaves me a top speed of 55 with a Fairey OD! But hey, I can sure get up to speed quick hehe."

Running the 3.54 range rover diffs will fix this compared to the 4.7 series diffs.

 

[dkfrizzell]

Well, at least I have that option so I can 'dial-in' the correct gearing once I have the auto in place. But my main goal here is to showhorne a slushbox in.

From the feedback so far, it sounds like I should do my best to use the LT230 -vs- a divorced setup. I also like the idea of the all-wheel drive transfer case. Just seems kinda cool. And for availability, going with a ZF from a LR would be ideal. The Peugeot ZF is not very plentiful.

So are all LR ZFs the same? A physically smaller tranny would be best. I remember somewhere reading the Defender has a smaller bell than the disco..

Dave

 

[leafsprung]

Keep in mind a 300tdi/auto is slower to accelerate than a fresh 2.25 gas with a manual . . . Diesel/auto sucks unless you have a lot of power (and 95hp isnt much) Tell your wife to get used to a manual.

 

[Yorker]

Dave,

what are you going to do with your series axles and goodies? When do you plan to embark on this project?

How much HP does the Zf suck up? 15-20? I can't remember, either way are you sure the Peugeot diesel has enough to spare?

 

[dkfrizzell]

I will probably sell/give to the best offer/first person willing to come get the stuff.

I will be keeping the 3rd members (for the lockers and gears) and rear HD axles, but the IIa chassis, axle housings, stock springs, IIa transmission/transfercase, fairey OD, etc. will be up for grabs. Hopefully I may even be able to sell some of it and offset the cost of the RR/Disco parts I need.

I hope to be knee-deep in this by the beginning of Oct.

Ya.. I am expecting and hoping for no more than a 15% drop in power. Another reason why I want to hold on to the IIa R&Ps. If I lose too much power, I can always run the 4.7 gears and get some of it back.

 

[Yorker]

Ahhh ok- you are all HD 24 spline with a Detroit rear and TT front right? I can't remember- it has been a while since we talked about it at Guy Fawkes. What happened to your Scout project? (I think it was a scout...)

 

[dkfrizzell]

Close.. 24 spine in the back w/ the Detroit, 10 up front w/ the TT.

The Scout got out of control and I had to let it go. It reached a point where it wasn't as fun to drive because nothing was much of a challenge. Just kinda point and click your way over stuff

 

[Yorker]

I hope to be knee-deep in this by the beginning of Oct.

So if you make it to Guy Fawkes it will be with Mooch in his Jeep?

 

[dkfrizzell]

yes, it would appear that I am going to be a passenger until spring... :nopity:

 

[Yorker]

yes, it would appear that I am going to be a passenger until spring... :nopity:

Thats ok, his jeep still makes people look stupid on that one hillclimb.

Will you need any 24 spline coiler stuff? I might have some extra- it depends what direction a couple current projects take. I had a F+R Axle from a disco that I was going to beef up and put in a '89 RR but now I'm re-thinking that project.