[Tigers] Embarrassed and Happy also...

Mon Sep 11 23:10:50 MDT 2017

I did a little bit of research. Dort 3 and 4 are pretty much equivalent. Dot
4 has a bit of an extra ingredient , borate ester, to increase the boiling
point a smidge.  Otherwise they are interchangeable. I suspect that those
who use it exclusively take the recommendation to use the highest boiling
point for the manufacturers spec that there is.  For me, it is probably a
good idea since I live in the shadow of death valley, lol. Even though I
will not be auto crossing or racing my car nor doing any spirited driving.
Just because it is hotter here. I do think that in cooler climes that Dot 3
would be entirely satisfactory for normal driving.  Dot 3 and Dot 4 are
fully compatible according to what I have read just tonight. 

In all things, YMMV. 

Mayf

_________________________
drmayf
Worlds Fastest Sunbeam, period.
204.913 mph flying mile average speed
210.779 mph exit (not top)  speed

-----Original Message-----
From: Gary Winblad [mailto:garywinblad at comcast.net] 
Sent: Monday, September 11, 2017 7:08 PM
To: Kirk Smith <twotigers at verizon.net>; 'Larry Mayfield'
<drmayf at mayfco.com>; tigers at autox.team.net
Subject: Re: [Tigers] Embarrassed and Happy also...

Humm....   I don't know the answer, but why does my 1999  C5 Corvette
specify DOT 3??
If DOT 4 is better, wouldn't they have used that?
Gary

On 9/11/2017 12:17 PM, Kirk Smith via Tigers wrote:
>
> Can’t help you with the gear sets
I don’t know if you were kidding, 
> but it’s DOT 4 for the brake fluid!
>
> Kirk
>
> *From:*Tigers [mailto:tigers-bounces at autox.team.net] *On Behalf Of 
> *Larry Mayfield via Tigers
> *Sent:* Monday, September 11, 2017 6:46 AM
> *To:* Tiger List
> *Subject:* [Tigers] Embarrassed and Happy also...
>
> Lemme deal with the embarrassed part first, lol. Long ago I had 
> purchased 2 posi units. One I ran in the Tiger in the late 60’s for 
> chuckles with a 4.55 gear set. Learned a lot, I did. That your daily 
> driver is not a race car,  nor is your race car a daily driver, 
> especially if its 25 miles or more to and fro.  So I grabbed a posi 
> that fit lower ring and pinion sets. I knew that there were difference 
> way back then but the passage of time dims all thigs, lol. First, the 
> posi that fits R&P units above I think it is, 3.73 ratios has a 
> different location for the ring gear. For instance the flange where 
> the ring gear is installed is roughly ½ inch closer to the ;inion 
> centerline. That is because as gear ratios get lower (higher
> numerically) the pinion gears get smaller and the ring gear has to 
> move towards the pinion to mate.  A 2.88 R&P has a large diameter 
> pinion gear set so the outward displacement of the flange was needed 
> to assure mating with the pinion. And then there is the difference in 
> fasteners. The 2.88 ring gear is held on with large bolts, the head 
> uses a ¾ inch socket to remove them. Then the 4.55 ring gear posi has 
> smaller fasteners. Simple check of trying to put a 2.88 bolt into the 
> flange on the 4.55 posi showed that .  By this time I had remembered 
> all this stuff that I had forgotten at least 50 years ago.  Red 
> faced
. So along witht eh 4.5 R&P I have for sale (already spoken for 
> as soon as I decide what to ask for it) I need to sell or swap my low 
> gear ratio posi for a high gear one. Or at best swap the POSI and R&P 
> for a high gear ratio (2.88 compatible) posi.
>
> Next the happiness
 I finished the drive shaft u-joint install 
> yesterday. While there is simplicity in putting all these things 
> together, they can be full on boogers when they want to be. Mine was 
> like that.  I did persevere, however, with Rick McLeod at SS and the 
> job is now done.  So I fired up the car, and after making sure that 
> lug nuts were torqued to around 50 ft-lbs (not pound feet) and that I 
> had air in the tire, and fuel in the tank, we drive it around the 
> block, about  ¼ mile!  The left front brake was grabby and pulling to 
> the left so I probably need to bleed then things. Dot 3, right? And 
> even after replacing the fuel vent line and filler neck hose, and 
> fixing a gas leak at the pump area, I STILL have the damned leaky gas 
> smell.  But the car ran and did fine after nearly 10 years of sitting 
> patiently.  So, need to bleed the brakes, and move the steering wheel 
> around a bit to more horizontal location and then drive it some more.
> Had a bit of oil on the drive way but I suspect that was from rear 
> main not being warmed up and from sitting forever.   Will see how that 
> goes today.
>
> Like to hear from someone or anyone who would like to swap posi with 
> me, or maybe has one to sell that is of the correct configuration 
> (axle spline count, and ring gear compatibility). As long as it is not 
> the same category as the nation debt ceiling

>
> Thank all ya’ll for help in the past. Us older folk need the 
> assistance; we are thankful for it!
>
> mayf
>
> _________________________
> drmayf
> Worlds Fastest Sunbeam, period.
> 204.913 mph flying mile average speed
> 210.779 mph exit (not top)  speed
>
>
>
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