Outer Limits 4x4 Board

Looking at converting my old girl to an auto (from 4speed).

I've been told that there are two A Zf and a torque flight 727 not sure what the torque flight is out of ?

can anyone help with any info on the conversion any input would be appreciated

thanks.

There is a few ZF's. There is the 4HP22, 4HP22EH, 4HP24EH.

The 22's are rated to about 380Nm, the 24 to about 500Nm. The EH means electro/hydro control on it (ECU). The 22 and the 24 bodies are basically the same with some internal differences like pumps and something else - not sure if its clutches, bands etc.

There are other auto conversions out there that companies like Ritters did years ago to suit Turbo400, C4-C10, C6, and they use the LT95 (old 4 speed) transfer case which may help in your conversion.

6.5 rangie wrote:There are other auto conversions out there that companies like Ritters did years ago to suit Turbo400, C4-C10, C6, and they use the LT95 (old 4 speed) transfer case which may help in your conversion.

How do they do that when the LT95 g'box & transfer case are a single unit?

Chire, it all depends on how much you want to spend. Most of the early Rangies (up to 92 I think) had the 4HP22 which is the basic 4 speed ZF. You can pick these up for between 1-2K then you will need a Transfer case on top of that. It also depends on what motor you are running.

The 22 was used with the 3.5 and 3.9 engines so it will be ok with them but I am not sure how it will ahndle the power & torque of a 4.6. I would love to here som other comments on this cause I hope to to the conversion as well and want to run a 4HP22 with a 4.6l.

walker wrote:How do they do that when the LT95 g'box & transfer case are a single unit?

I think they still split.

How do they do that when the LT95 g'box & transfer case are a single unit?

It is all one piece but they cut the transfercase off and machine it up to take an adapter to suit the choice of gearbox, apparently they did thousands of these (i have one in my Rangie), i know where there is one for sale if your interested as they are a very strong transcase with a very common (and cheaper) gearbox.

Damien

I know a guy who has been running n early ZF for a few years now with a 4.6 with a supercharger and he is on 35 ET's and drives very hard.....no probs but he makes sure the auto is always serviced regularly

HTH

Mick

Slunnie wrote:

walker wrote:How do they do that when the LT95 g'box & transfer case are a single unit?

I think they still split.

Sorry, I was looking at my series transfer that has been grafted onto a Nissan 5-speed - Not the LT95.

which every trany that i chose it will have to be stong enough to handle 37's in a comp truck i run a 3.5 hi comp engine i haveand have no intension to change as it does the job, thanks for your thoughts .

Looking at doing the same. Are any of the ZF's electronically controlled?

Failing that I'll start looking for the heavy duty version 4HP24.

chire wrote:which every trany that i chose it will have to be stong enough to handle 37's in a comp truck i run a 3.5 hi comp engine i haveand have no intension to change as it does the job, thanks for your thoughts .

3.5 to run 37's serious?? What diff ratios are you planning to run?

we have run the car for the last year in comp and club days with standard drive component with a great deal of succsess even though a little over geared i found that you have to change your drive style and the way you set up your diffs i will try the 3.54s with 37s and the auto and see how it goes no expetations like they say time is always the governing facter.

3.54's, an auto and 37's.

Hope your torque convertor is in good nick

TuffRR wrote:3.54's, an auto and 37's.

Hope your torque convertor is in good nick

Yep, that's got to put a lot of strain on the torque converter.

Now I am looking for people for a group buy of Ashcroft 4.11 diff ratio's, I think you should get some.

4.11 toys heaps cheaper but you got to buy axles