Mud-club
Vehicle & Technical => Range Rover => Topic started by: tjolliffe on October 20, 2008, 09:51:51
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Hi guys,
I've currently got a RRC with a Chrysler 3 speed auto box in it running a Schuler Ferguson transfer box. I'm looking to take out the Ferguson box and put in a Borg Waner, does anyone know if it will fit on the back of the Chrysler auto box?
Cheers
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Not sure on that one, but if you are doing all the work to change the transfer why not put a 4 speed ZF on the front of the BW plenty of those about, I have one lying in the barn,, came out of a Rangie but with an LT230 on it.
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Question is WHY, the Schuler box has a 60/40 split and a viscous coupling, so unless it's FUBAR it should be a better box on-road and just as good off.
Now, the Chrysler 3 speed was available with the LT230 box, which is interchangeable with the Borg-Warner, though if memeory serves it had a very high ratio on the 3 speed to make up for the lack of cruising speed, so your 1st becomes like my 2nd, your 3rd my top (without lock-up).
I'd agree that a far smoother, quieter box would be found in the ZF 4-speed, with better performance off-raod, better cruising with the lock-up and far less agricultural. Ultimately not as strong though but you're unlikely to bust a ZF in a RRC.
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sorry to hijack, but can someone explain what this lockup is on an auto box? cheers
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Sure.
The ZF box has 4 descrete ratios, 1st-4th, governed by speed and engine load/throttle position ok ;)
When the road speed is above 53mph and the load light, the torque converter (fluid coupling between engine and box) has a further clutch in it that locks up, so the transmissionbecomes like a manual with no slipping and the engine and road speeds tied together, ie the engine roves don't suddenly climb when you hit the gas. If you kickdown in this condiont the gearbox drops straight to 3rd.
Some people refer to it as a 5th gear, which when it engages it does feel like another gear.
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Sure.
The ZF box has 4 descrete ratios, 1st-4th, governed by speed and engine load/throttle position ok ;)
When the road speed is above 53mph and the load light, the torque converter (fluid coupling between engine and box) has a further clutch in it that locks up, so the transmissionbecomes like a manual with no slipping and the engine and road speeds tied together, ie the engine roves don't suddenly climb when you hit the gas. If you kickdown in this condiont the gearbox drops straight to 3rd.
Some people refer to it as a 5th gear, which when it engages it does feel like another gear.
Mine doesn't lock up much then as I dont really drive over 40 mph