Re: GTI vs Rocco Parts.

[drew <drew@dyermaker.cs.uoguelph.ca>]

The FF transmission, along with most other A1 5 speed gearboxes, does use
a 3.89 final drive.  However, the 2H, 4K and 7A boxes ALL use a 3.94 final
drive. The 2H and 4K are close-ratio transmissions that shipped in Rabbit
GTI's, Scirocco's, Cabriolets and A1 Jetta GLIs.  The 7A is an econo box
with a .71 fifth gear a .89 4th (matches the fifth in the close-ratio
boxes.)  It was found in many 84 Rabbits and Jettas, gas and diesel.  
IMHO this is an excellent box for a mildly modded motor, as it offers a
performance final drive coupled with a tall fifth gear for cruising
economy.  As I understand it, the primary difference between the 2H and 4K
boxes is that the transmission case on the later boxes is compatible with
the A2 trasnmission case - ie. you can bolt up an A2 rear mount.  In
addition, the 2H has a slightly shorter fifth gear, .91 vs .89 in the 4K.

Interestingly enough, I've found the 2H to be a more rare box.  It was my
understanding that only the 83 Rabbit GTI's and 83 Sciroccos with JH
motors came with 2H boxes, while 84 Sciroccos, Cabriolets, A1 GLIs and
late 84 A1 GTI's came with the 4K box. I currently have 4 4K transmissions
in my inventory, and I have yet to even see a 2H transmission! I guess it
may have something to do with the fact that I don't hang around
Westmoreland bult VW's much... :)

HTH,

Drew (84 Wolfsburg Ed with 7A tranny, anybody wanna buy a 4K or 3?)


> It's not the ratio between gears really that you'd be after, it's
> the final drive ratio.  The 2H & 4K trannys commonly found on 83 & 84
> GTI's have a final drive ratio designed to accelerate the car more
> quickly at the expense of higher rpms / mph gained in a particular gear.
> There's an interactive gear calculator on scirocco.org if you want
> to play around with the math.  Those trannys use a bigger 'lever' in
> a manner of speaking (and it's all about leverage) to give the engine
> an easier time accelerating the car at the expense of higher rpms.
> The standard Scirocco common transmissions (9A, 2Y, AGB) have a
> final drive of 3.67:1, while the more uncommon 4K has a 3.89:1 and
> the 2H has a 3.94:1.
> 
> >2)If it is blowing white smoke, could the head gasket (already asked) be Ok,
> >but the block cracked?
> 
> Head gasket could be shot...do a compression test.  Check for exhaust
> smell in the coolent...
> 
> >3) will the gear shifter parts fit my car. Namely the main selector shaft?
> >($157.00 from the dealer)
> 
> 
> Yes it fits, but the bend in the shaft is a little different if I
> remember correctly.  I also think you should check with Mike or Mark
> before seriously spending any moeny at a local VW dealer.
> 
> >I am going to assume that the seats will fit.
> >What other parts could I use to renovate my car?
> 
> 
> They will fit, but the rear part of the front rabbit/GTI seats
> are 'jacked-up' on metal posts.  This makes them too tall for
> comfort in a Scirocco with a lower roofline.
> 
> later!
> 
> ==Brett
> 
> >
> >Julie
> 
>  \/  '84 Scirocco (ITB racer 2B) | "Hot VW's, take two home. They're small"
> \/\/ '88 Scirocco 16v (Show), '85 Scirocco (Winter) | - brett@netacc.net
> 
> --
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> 

Drew MacPherson, Network Analyst, University of Guelph

drew@dyermaker.cs.uoguelph.ca           |  visit the Massey-Harris page:
http://dyermaker.cs.uoguelph.ca/~drew   |  http://m-h.cs.uoguelph.ca


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