the 1980-1984 FF, FO and FN transmissions had a .71 5th gear. Autotech sells a .71 5th kit as well. Not cheap though.The bad news on the FF, FO and FN transmissions is that they won't bolt into your ECODiesel. The gearset will, but the transmission will not.I think the bigger problem is the high final drive. That's higher than any stock VW trans. It's a desirable transmission, but if you want MPG, you'll want to go down to 3.89 or 3.91. You can try a 3.67, but I generally find the cars get doggy with the 3.67.
i have 3.67's in my rabbit in an AUG trans. everybody told me to avoid an aug like the plauge, but i had a free low miles trans, so i used it, and boy im glad i did. it might not have a very high fifth gear (.89) but it sure is fun to drive. i get great mileage also. and its so nice having a GTI feel with the close ratio trans, it keeps the turbo spooled alot better than the old GC 4 speed did.
Quote from: Rabbit on Roids on September 08, 2009, 12:45:05 pmi have 3.67's in my rabbit in an AUG trans. everybody told me to avoid an aug like the plauge, but i had a free low miles trans, so i used it, and boy im glad i did. it might not have a very high fifth gear (.89) but it sure is fun to drive. i get great mileage also. and its so nice having a GTI feel with the close ratio trans, it keeps the turbo spooled alot better than the old GC 4 speed did.I generally eschew the use of a 3.67 in a 1.6 unless you've got a turbo with LDA to push it in 1st, 5th and reverse. 2nd thru 4th are fine in any trans, but the 3.67 with a low power motor makes takeoffs and reversing a little hard with a 1.6NA. Also, you need the power to accelerelate in 5th if you've got a .75 or .71 and a 3.67 R&P. Otherwise, you'll do alot of downshifting to pass on the highway in 5th gear.A stock ECO, despite having a turbo, is still light on power. Unless the cat's been ripped out and an LDA pump installed, it's still limited in power. It might work. I've never tried it. But, if you could find an ACH, AGS or AOP and add a .71 5th (since he's having the trans rebuilt anyways), then that would be ideal for a stock ECO (in my mind). The original 1.6TDs sold in the Jettas had those transmissions and they hauled a$$.
Doakster,I have been there, I had an AWY in my NA Jetta. (3.94,3.45,1.94,1.44,1.13,.89)First I had a FF put into a 4S MKII case (3.89,3.45,1.94,1.29,.97,.80)(the 4S was trashed).With the FF it was decent, but the .80 was not tall enough for the 70 mph interstates.I put a .71 5th in. (purchased from www.brokevw.com, GREAT transaction and support).The car is very good at highway speeds now, the only drawback to this setup is the large jump from 4th to 5th.I would recommend this setup for anyone who had lots of highway in their driving and doesn't want to try a 3.67r&p.If I ever have to do another tranny for this car I am going to look for an ACN.VelocityConservation