-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of
david.clement@verizon.net
Sent: Tuesday, December 23, 2003 9:39 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: RE: 911: transfer case blew up
I believe the chain is always being driven by the output of the
transmission.
The engaging/disengaging of the front drive shaft and low range shifting all
occur in the transfer case.
I've discovered that in any situation where "I said, he said" comes into
play, it's important to define what we're talking about. In this case it's
Mike Maskalans' 1998 SLT 4x4 with NV231 transfer case.
The chain drive sprocket is only coupled to the transfer case mainshaft when
the mode hub makes that connection. Otherwise it doesn't turn.
In 2HI, the mainshaft couples the transmission output to the rear drive
shaft. Nothing else turns and the input to output ratio is 1:1
In 4HI, the mode hub couples the chain sprocket to the mainshaft. The chain
drives the front drive shaft. That's all it does. The ratio of the input to
the two outputs (front and rear drive shafts) is 1:1
In 4LO, the range hub couples the low range planetary assembly to the rear
part of the mainshaft at 2.72 times the speed of the transmission. The mode
hub still connects the chain sprocket to the mainshaft. The two outputs
(front and rear drive shafts) are turning at 2.72:1 relative to the
transmission output.
In any case, it's broke. The internal oil pump may have been one of the
pieces that hit the highway making any travel a real risk to further damage.
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:47:13 EST