ITC transaxles

[ITC Mercury]

I was hoping some of you guys might be able to help me sort out some gear ratios. I'm going to have a Quaife put in one of my trannies while its being rebuilt. I have two VW itc legal trannies 1) GC 01 11 8 2) FF 27 08 0. I read that the numeric part of the code is the day-month-year of manufactureand that trannies with codes 01 07 0 and newer had .91 fourth and .71 fifth gears instead of .97 and .76. The change doesn't seem to be significant but the older GC tranny has different mounts than any other 020 transaxle I've seen. The bolts all appear to line up its just that the case itself bolts up to the left mount differently. Is this a legal tranny? Too I was warned about GC transaxles with a 1.37 third gear. Does anyone know what year those may have been in? I tried counting the revolutions on the drive flanges but I got different numbers every time I did it. Any hints on how to do this correctly or clarification on the ratios would be greatly appreciated as I don't want to sink my limited cash into the wrong unit.

Thanks Erik

[racer_tim]

Erik, there are lots of references as to whch box came out of what year car, etc. Here is one that I found @ http://www.spiretech.com/~vw6spd/tech.html

Check out the bottom of the page for the chart. From this reference, the GC is a 4 speed box, and the FF is a 5 speed.


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Tim Linerud
San Francisco Region SCCA
#95 LP GP Wabbit
http://linerud.myvnc.com/racing/index.html

[evanwebb]

Looking at that chart I understand that it says .97 and .91 for the final drive for the early four speed boxes. I haven't had one of these gearboxes apart to see for myself, but does that mean that the final drive is overdriven? It's not direct drive?

[ITC Mercury]

from what I can tell some time around 7/80 they switched to from .91 to .97 fourth gears in the GC and FF transaxles. They also switched from .76 to .71 fifth gear in the FF transaxle. I was also told earlier today that the later boxes with the .91 and .71 4th and 5th gears are not legal in ITC. Tim thanks for the link. I''ll dig up the sites I found with similar info and post them later.

Thanks Erik