[DeTomaso] ZF gear oil per Lloyd Butfoy

[Kirby Schrader]

FWIW, I have a .655 5th in my Pantera and a .640 5th in my GT40.
Both have a 4.22 stock Pantera ring and pinion.

Couldn’t be happier with the combinations. I wanted a .655 in the GT40, but was told that wasn’t available anymore by Quella.
Maybe he just had a .640 laying around he wanted to get rid of….???
:-)

The GT40 guys, including Olthoff, said I was making the wrong decision and should have gone with a 3.77.
However, once Olthoff drove my car with the 4.22 and .640, he said he was amazed and it was a really good setup.
Yeah, maybe he was just strokin’ me....

Regardless, I really like the combination in both cars. 
What really changed things was when I went from 345x15 rears to 335x18 rears on the Pantera… 
Wow… it be tall now!

I don’t think I’d like 3.77’s…. Just sayin… 
I ain’t got enough HP to do anything with those, anyway.

Again, FWIW…
Kirby


> On Feb 9, 2015, at 19:07, Julian Kift <julian_kift at hotmail.com> wrote:
> 
>   I would disgaree with Mr. Drew on the combination of 3.77 and 0.62 5th;
>   With a talll 0.62 5th and 4.22 R&P 75 mph cruising speed is dropped
>   from stock 2,800 rpm to 2,500 rpm. Go with the 3.77 R&P sticking with
>   the stock 0.705 5th it's the smae 2,500 rpm. The combination of 3.77 &
>   0.62 tall 5th lands at 2,200 rpm for 75 mph. As the ZF 5th is truly an
>   overdrive gear for high speed cruising anyway, I'd be happy at 2,200
>   rpm for 75 mph, with the bonus of the higher 3.77 gearing through 1st
>   to 4th.
> 
>   Of course if Mr. Drew potters along in the left hand lane with his tall
>   5th at 65 mph he will be turning 2,200 rpm anyway! I'd shift that 3.77
>   down to 4th and turn 2,600 rpm at that point, but I can understand some
>   older folks find all the shifitng too much ;)
> 
>   Julian
> 
> 
>   To: julian_kift at hotmail.com; detomaso at poca.com
>   Subject: Re: [DeTomaso] ZF gear oil per Lloyd Butfoy
>   From: fresnofinches at aol.com
>   Date: Mon, 9 Feb 2015 19:35:37 -0500
> 
>     If I was forced into buying a Ring & Pinion I think I'd have opted
>     for the 3.77
> 
>   It was considered.
>   The 3.77 AND the .620 is, per Mr. Drew, not viable without a STRONG
>   engine. There is such a thing as too high.
>   The 3.77 by itself with no 5th change would give the desired MPG
>   improvement, but at the expense of the car's normal performance
>   characteristics.
>   I, and surely most owners, will only have to rebuild a ZF once during
>   our period of ownership.
>   I'm just biting the proverbial bullet and hopefully giving 2511's ZF
>   another 80,000 miles or so of satisfactory performance.
>   Larry
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