Thread: Fitting a LT95 transfercase to a 700r4 trans

A few companines in AUS cut the LT95 down and adapted both the BW35 and Ford C9 auto before the TF727 was factory fitted.

Originally Posted by De Ranged

Divorcing an LT95 transfercase from an old RRC 4 speed and matting it up to a TH 700r4 automatic from a holden commodore

let me know if its relevant and wanted

Cheers Reece

*opens Popcorn and subscribes*

In my case the reason I started with it was because I had a couple spare and they were worth just scrap weight and I knew they were strong
The first bonus was discovering low ratio is 1:3.3206 when compared to the Isuzu Bighorn transfer case which is the normal budget conversion onto the 700 trans as the output splines are a match, it only has a low ratio of 1;2.28
Next bonus is with a bit of machining you can turn a spare diff lock dog clutch into a dog clutch for a PTO

Now I haven't finished it yet and to be honest I have a concern about the minor shaft dia after shortening the output spline on the 700 trans (this has been done due to length being more important and will explain more when I get to that point)

There are a couple of issues....
First I found out online that the LT230 (since the Lt95 case was the what they based this off.. think this applies) won't allow the front drive shaft to fit past the sump on the 700 trans.... found this very funny as someone who has gone to the trouble to join these cant work out a two piece drive shaft solves this lol
Divorcing the LT95 from the gearbox means the main shaft has to be cut and a spline cut in it... this is semi specialized stuff, I have a home baked system that while not perfect works well, will post up some pics later
And one annoying issue the LT95 cases seem to be the worst alloy I have ever tried to weld

Now a few things that dictate a few of my choices
I have drive line length issues (want to fit the motor behind the front axle) so I have made some choices right or wrong based on this
I also want a flat bottom so I will be clocking the transfer case up so its lowest point is level with the trans pan
I have a character flaw in that I hate to part with money, this does impact on decisions alot lol

Originally Posted by loanrangie

A few companines in AUS cut the LT95 down and adapted both the BW35 and Ford C9 auto before the TF727 was factory fitted.

I have the C9 version, beautifully engineered by Ritters.

The output shaft on the auto is modded, runs through a short adapter case onto the LT95 TC shaft. Everything in stock mounting position.

Wouldn't like to attempt it from scratch! Look forward to seeing a T400 version.

DL

First off I attacked the LT box.... there is a nice solid separating wall in between the transfer case and the gearbox on these

I was lazy and just pulled the counter gears shift linkages etc and then cut the excess box off, left the main shaft and reverse shaft in place


The idea being the main shaft kept any Carborundum from the cutting disks out of the bearings and reverse shaft keeps the stuff out of the transfer case
Here's a pic of the cut line


With the case fully stripped mounted it up in the mill and leveled off a mounting face

Note I've left the area around the main bearing this is so I can come back a later date when I know my seal size and machine a seat for the seal
The plan was to cut some filler bits of Alloy and weld them into the "hollows" in the case then machine again for a smooth surface that I could bolt an adapter housing to.... but this idea is on hold due to an attempt at welding turning to custard due to the weld pulling so much impurities from the casting that the weld had no strength
I have the option of playing with the settings on the miller and running cleaning runs to draw the crap, then remove, repeat till I have something good to weld to (something I've never had to do before lol) or I redesign how I attach the two together.... decided to carry on with other bits and decide later lol still haven't made my mind up on this
Will explain my answer to bearing strength and the crap roller bearing on the case end of the main shaft with the next bit

Originally Posted by 350RRC

I have the C9 version, beautifully engineered by Ritters.

The output shaft on the auto is modded, runs through a short adapter case onto the LT95 TC shaft. Everything in stock mounting position.

Wouldn't like to attempt it from scratch! Look forward to seeing a T400 version.

DL

I have some Siii chassis left in stock position but seats and everything above this is getting modded anyway so thats not a concern
Me I just like the challenge, and the gearing and PTO lol they are worth the problems... and I have found if you break things down to little problems and focus on each all it takes is time

ID have thought the lt230 would have beena simpler prpositions.

When I first built the 6x6 camper I had a Ritters conversion for the LT95 T,box onto a turbo 700 and put it behind the Chev 6.2 diesel.
The 700 couldnt cope so put it behind an L480E or somesuch. Couldnt keep it cool. Sold it off and made my own putting the Lt95 t,box behind the Isuzu MSA behind the Chev V8.
Best thing I ever did