All .75 fifth gears fit a 4k?

[jdbubb at verizon.net (Dan Bubb)]

I don't know that I'd get all that wrapped around the axle about whether the 
engine can pull it. Recall that the .71 5th with 3.89 FD originally came 
attached to a 1.6L 8V.
I think you're twin 16V turbo example is pretty extreme in that you must be 
planning to run huge turbos that don't come on until over 4000 RPM.
There was no hill I had to downshift for traveling from here to Cincy in my 
nephew's turbo 8V with .71 5th and  3.67 FD, so it's all in sizing the 
turbo.
Personally, I'm going with a .80 5th in my 2.0L 16V. I just really hate the 
huge gap between 4th and 5th.

To answer the original question, all 5th gears will fit any 020 box. You 
need to make sure you get the correct retaining clip of the gear and verify 
there is no axial movement of the gear on the splines.
Dan

From: "Allyn" <amalventano1@tds.net>
Sent: Saturday, June 24, 2006 10:05 PM
Subject: RE: All .75 fifth gears fit a 4k?


> 0.75 on a 4k final drive (3.94) should be just fine.  A N/A 2.0 16v can do 
> just fine even with an FN 5th  (0.71 on 3.89 FD).  Where
> it gets questionable is where you take a really wide FD (3.67) and couple 
> it with a 0.71 5th.  I ran some simulations where 2 16v
> turbos (assuming 500 hp) barely squeaked through the 80-100mph in that 
> wide of a gear - this was because speed was too high with
> respect to the engine, which was barely into its powerband.  If the sim 
> was correct, that wide of a gear would barely hold highway
> speed in a car of lesser power, and would require frequent downshifts any 
> time you hit a hill or tried to pass at speed.  For what
> its worth, that wide combo is one of the few possible ways to get a twin 
> 16v turbo to theoretically hit 160 mph before exceeding
> 7200 rpm.
>
> hth
> Al
>
>
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