4BD1/T and a slushbox?

[Sprint]

has anyone ever tried a 4BD1 with an auto? what did you use? how well did it go in terms of reliability/performance?

[Blknight.aus]

Ive seen one mounted up against an alison.

light agricultural use so performance wasnt really a requirement it just had to work. Im pretty sure its still lumping along.

youd probabley get away with putting in one of the smaller truck autos though.

[Rangier Rover]

An Allison would handle it well but may not be all that efficient. As Dave said agricultural.
JC tried a ZF 4HP22 but didn't last:( I'm working on a ZF 4HP24 ES with compushift for my next Rangie:eek:. Have no proof it will stand up to the torque pulses either. I feel the lock up converter will be the death with the HP 24:(

[Sprint]

so dont use the lockup feature?

[justinc]

Yes, Sprint it would be a fantastic conversion if you found a box that lasted. I enjoyed it immensely until after 3 rebuilds I gave it away for a LT95.

As Tony says a 4HP24EH with compushift should take it fine, IF I wanted to revisit the auto again (I still have all the adapters etc) thats the way I would go.

JC

[Dougal]

A heavier flywheel would be the first mod if you wanted a lighter box to last.

[justinc]

Agreed about the flywheel, but the other issue I had was the immense torquue ripping the clutch material off the lockup clutch. That is where the much bigger 4HP24EH torque converter would be a bonus.

I got 10000km out of 1 box, the lock up clutch material ended up all through it and I lost gears eventually due to contaminated valve body etc.

JC

[Bush65]

The Isuzu trucks are reasonably common in the USA (re-badged as GM's) and nearly all have auto's.

The Jatco auto's used with the 4BD1T's have a poor name.

Aisin auto's, similar to what is used in some Landcruisers, were used with later Isuzu engines and it appears some people have mistaken these for Allison's.

Over there (USA), several GM autos have been used successfully with 4BD1T/2T conversions into lighter vehicles like ours. They have retained the Isuzu flywheel, which together with the mass of the torque converter, reduces the torsional vibrations.

[isuzurover]

Aisin auto's, similar to what is used in some Landcruisers, were used with later Isuzu engines and it appears some people have mistaken these for Allison's.

Over there (USA), several GM autos have been used successfully with 4BD1T/2T conversions into lighter vehicles like ours. They have retained the Isuzu flywheel, which together with the mass of the torque converter, reduces the torsional vibrations.

I think the confusion has arisen because all the 6xxx Isuzus run Allison Autos. E.g. the GMC W5 / W5500 (Isuzu NRR FRR) runs the Alison AT542. The GMC4000 was the model which had the 4BD(1/2(T)) and Aisin Auto AFAIK.

Adaptors for GM auto boxes:
Overview (http://www.isuzudieselswapper.com/)

Some drawings and specs of the Aisin box here:
www.shinseiauto.com/japanese/transtar/ata440f04.pdf


EDIT:
Also found this:

N-Series models, offered in wheelbase options of 109, 132.5, 150, and 176 in., feature front disc and self-adjusting rear-drum brakes as standard.

The Class 3 NPR Diesel, available in 12,000 lb. GVWR, and the Class 4 NPR Diesel HD, rated at 14,500 lb. GVWR, are powered by a 142-hp. Isuzu turbocharged 4.8-liter 4HE1-TC diesel. Also new is the MXA5C fully synchronized, 5-speed manual transmission; an Aisin 450-43LE 4-speed automatic transmission is optional.

Assembled in the U.S., the Class 3 NPR-GAS, rated at 11,050 lb. GVW, and the Class 4 NPR-GAS HD (14,050 lb. GVW) are powered by a GMPT-V8 gas engine.

Newly added to Isuzu's lineup, the Class 5 NQR, rated at 16,500 lb., is available in four wheelbase choices. It is powered by the Isuzu 4.8 liter, 4HE1-TC, engine that develops 175 hp. at 2,700 rpm. The Class 5 FRR Diesel, with a GVWR of 18,000-19,500 lb., features a 7.1 6-cyl. Isuzu 6HK1-TC engine that delivers 200 hp. at 2,500 rpm.
Previewing 1999 Truck Models (http://driversmag.com/ar/fleet_previewing_truck_models/)

[Dougal]

Agreed about the flywheel, but the other issue I had was the immense torquue ripping the clutch material off the lockup clutch. That is where the much bigger 4HP24EH torque converter would be a bonus.

I got 10000km out of 1 box, the lock up clutch material ended up all through it and I lost gears eventually due to contaminated valve body etc.

JC

To put that into perspective. You can hit 600Nm with a 4BD1T depending on the injector pump (size of pump elements) and boost/intercooling.
What's the biggest torque engine factory fitted to a ZF?

[kylepres]

Hi everyone, new here but have been lurking! does anyone know if the Aisin box, Chevy boxes or jatco boxes would fit physically into a range rover classic? I know there would be work to do mating them up with the landy transfer box to get 4wd.

thanks

Kyle

[Dougal]

Hi everyone, new here but have been lurking! does anyone know if the Aisin box, Chevy boxes or jatco boxes would fit physically into a range rover classic? I know there would be work to do mating them up with the landy transfer box to get 4wd.

thanks

Kyle

I beleive marks do an adapter to fit the chevy auto to the LT230 transfer. It will probably be longer though which will mean modified driveshafts etc.

[kylepres]

thanks for the info Dougal. Was trying to cost a conversion out and was thinking of using as many parts of the original vehicles as possible. If the jatco box isn't up to it then (if I can get hold of one) an isuzu manual or a GM auto might be the way.

thanks again.

[Bush65]

Hi everyone, new here but have been lurking! does anyone know if the Aisin box, Chevy boxes or jatco boxes would fit physically into a range rover classic? I know there would be work to do mating them up with the landy transfer box to get 4wd.

thanks

Kyle
Sorry I don't have any experience with the autos.

A body lift would give more clearance - in engine bay for engine, and the transmission tunnel.

You will also need to check clearance for front drive shaft, and front extension housing of the LT230 beside the auto.

If the transmission is much longer, you will have to address clearance from LT230 to the floor cross member that supports the seats and takes the seat belt loads.

[isuzubob]

To put that into perspective. You can hit 600Nm with a 4BD1T depending on the injector pump (size of pump elements) and boost/intercooling.
What's the biggest torque engine factory fitted to a ZF?

BMW 5.0L V12 - 450 Nm (750iL & 850i 1987-1994) - 4HP24.

Don't know enough about ZF's but would a 5HP be able to be modified easily enough?

5HP30 - 1998 Bentley Arnage 4.4L V8 twin turbo (1998-2000) - 570 Nm
The 5HP30 was fitted to various BMWs from 1992-1997

Rob W