I replied off list to Bob regarding the shortening of the drive shaft when
using both Herman's tranny and Goodparts Nissan diff. I got a shaft
shortened, but ended up using the uncut one. I do recall having a bit** of
a time getting the shaft on the diff because it was just long enough to not
be able to get a wrench on the engine side of the flange at the diff. Ended
up fabricating some long extension so I could hold the nut or bolt from the
far side of the cruciform plate. Course this argues for the shorter shaft.
Cannot remember why I did not use it -- probably thought it pulled the shaft
out of the tranny too far. But having read what Herman wrote, that was
probably a mistake. Do not have any leaks after many track miles, so I
assume it is OK.
Chuck
On Dec 21, 2007 1:57 PM, Sally or Dick Taylor <tr6taylor@webtv.net> wrote:
> Bob, and others who may be in is position---
>
> Of course we wouldn't want to "shorten" the drive shaft if it weren't
> necessary to do so. It would seem prudent to compare the two diffs to
> see how much farther forward the pinion shaft and its flange locates. If
> the Nissan diff is two inches "longer" and it uses up too much of the
> slide in the propshaft and tranny tail shaft splines, then the seal at
> the tranny tail shaft is at risk. At some time in the future I will
> probably go the Nissan limited-slip route, and this would be my thoughts
> about the possible shortening.
>
> Dick
>
> Sender:
>
> From: 75TR6@tr6.danielsonfamily.org(Bob Danielson
>
> Last night I posted a question about who had the Toyota 5 speed and
> Nissan diff combo and if they had to shorten their drive shaft. I got a
> lot of off list responses and no one had shortened their drive shaft
> except for one person. This morning I had a 30 minute call with Herman
> to understand (or try to) why he now says it HAS to be shortened.
> Basically, there are 2 slips in this set up: Slip 1 is the flange on the
> rear of the tranny and Slip 2 is in the drive shaft. Both slips can move
> in and out, effectively lengthening or shortening the overall length. If
> the tranny flange is moved in too far it will damage the rear seal over
> time causing it to leak and eventually leak bad enough to cause total
> fluid loss. It's happened to one owner already while on a drive &
> destroyed the tranny. If the flange moves out too far (more then 7/8"
> from the seal) it causes a whipping action which will wreck the tranny
> bearings. Herman says to have the driveshaft cut to length, remove the
> slip and end up with a solid drive shaft with no clamp. I'm only the
> messenger so If you have questions, you might want to contact Herman
> directly.
> Bob Danielson
> 1975 TR6 CF38503U
> Running w/ Throttle Body Injection
> http://tr6.danielsonfamily.org
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--
Chuck Arnold
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