[DeTomaso] ZF removal question

[michael frazier]

My sense of it tells me that under acceleration that there is much much more force in the verticle plane than rotational around the crank line.  It's being pulled up and down rather than twisted.  

Michael...maybe I'm wrong...haven't had lunch yet.
 
> From: Pantera007 at provamo.com
> To: dakelm at qwest.net; rimov at charter.net; deTomaso at realbig.com
> Date: Fri, 1 May 2009 09:25:44 -0700
> Subject: Re: [DeTomaso] ZF removal question
> 
> Correction:
> 
> I have heard of at least two occasions where the BOLTS stripped out the case
> threads. I have not heard of a problem when (the ZF designed) studs are
> used.
> 
> 
> 
> 
> 
> 
> Yes... and No.
> 
> This was the topic of debate at the last ProvaMo tech session. For those
> watching (and listening) to the real-time broadcast they heard more than I
> did, as I was busy running the event...
> 
> Let's see if I can summarize... as I was not present during most of the
> talk...
> 
> The ZF case is aluminum. The difference between studs and bolts is that a
> stud splits the torque tension between the two ends, where the (steel) bolt
> applies most/all of the tension stress on the non-head end. This end is in
> the aluminum case.
> 
> Also, the ZF applies its rotational tension (think about hard acceleration)
> to these side mounts, thru the studs or bolts into the chassis.
> 
> The reason the early ZF tail mount was replaced/upgraded to the side mounts
> was due to the flex and rotational stresses involved, so it is substantial.
> 
> I have heard of at least two occasions where the studs stripped out the case
> threads. I have not heard of a problem when (the ZF designed) studs are
> used.
> 
> So as much as I loved the idea of the ease that bolt use provides (and I
> switched to bolts), once I understood why studs are used, I switched back.
> 
> This would be a great topic for a "Fastener Expert" to chime in!
> 
> Jack, you have some knowledge on this subject, what do you think?
> 
> Dan Jones you have an opinion?
> 
> Who is the guy on this list that has 'expert' fastener knowledge?
> 
> 
> Chuck
> 
> 
> 
> 
> Whatever you do, remember to replace the six rear mounting studs with bolts
> so that the next removal is not such a PITA!
> 
> ----- Original Message ----- 
> From: "P. Rimov" <rimov at charter.net>
> To: <deTomaso at realbig.com>
> Sent: Thursday, April 30, 2009 10:24 PM
> Subject: [DeTomaso] ZF removal question
> 
> 
> > I know there are a couple of ways to pull the ZF, one way requires bending
> the rear ear mounts back and down which, quite honestly, I do not want to
> do. The other way requires unbolting the engine motor mount bolts that go
> through the hockey pucks, lifting the ZF while tilting the engine then
> pulling the ZF backwards while the engine is supported with a jack.
> >
> > My question if I pull the ZF in this manor, do I need to remove the
> headers from the block or do I need only remove the exhaust at the
> collectors. I know I will need to remove the dizzy.
> >
> > Thanks
> >
> > Paul
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