Author Topic: can you change the ring and pinion to a different ratio ? (Read 5736 times)

cadmo · « **on:** January 06, 2005, 05:04:52 pm »

my car a 95 gulf td 020 tarnny, on the high way at 120 k it revs at about 3100 rpm and im not getting the greatest millage and while normal driving at that speed the pedal is nearly to the floor and 95% of my drive is on the hwy.

I went on to All Data to find out the final drive ratio and its 3.667:1, now could you change that ring and pinion to something like 3:1 or some thing around there so that it doesnt rev so much on the high way? and if so where could you get them from? does any other vw tranny have a lower final gear ration that would work? or what about the aftermarket, i havent seen any but im still new to vw's.

Patrick · « **Reply #1 on:** January 06, 2005, 06:06:45 pm »

As a rule, the gassers are geared a little taller. Presumably you could take a complete tranny/diff from a gasser and just swap it. You may not be happy with the car if you do, though. You need the lower gearing to get the diesels rolling!

RAMMSTEIN · « **Reply #2 on:** January 06, 2005, 08:10:26 pm »

You could find yourself a 02A tranny from a B4 or an A3 TDI.

Final ratio is 3.156 and the fifth is .756.

You can't get a longer ratio tranny on any other Volkswagens.

At 100 kph, you rev at 2100 rpm. :wink:

cadmo · « **Reply #3 on:** January 06, 2005, 10:00:30 pm »

ok but what years and models would those be? you have to rember that im still knda new to vw's

jtanguay · « **Reply #4 on:** January 07, 2005, 01:06:12 am »

A3 TDI is what, 97 or higher? Look for a wrecked TDI and try to get the tranny. Might just bolt right in? Then maybe get some electronic controller for the wiring harness

Dr. Diesel · « **Reply #5 on:** January 07, 2005, 08:37:58 am »

i'm running an AGS tranny with a 3.67 final and .71 5th. 2750 rpm at 100km/h.
Sweet.

RAMMSTEIN · « **Reply #6 on:** January 07, 2005, 11:54:26 am »

A3 TDI's are from 1997.5 to 1999.5.

B4 TDI's were sold in 1996-1997.

cadmo · « **Reply #7 on:** January 07, 2005, 12:25:20 pm »

ok now does anyone know if those 2 tdi trannys will bolt right up to my td? and what wiring does a stick tdi tranny have that i need to deal with?

and if i wanted to be really cheap could i get just the ring and pinion gear from a tdi and put it in my td tranny? if no one knows who might i go about asking?

Mark(The Miser)UK · « **Reply #8 on:** January 07, 2005, 04:10:51 pm »

Maybe the pinion out of a 5 cylinder Quantum gasser would work.
Maybe just the 5 speed clusterswapped this has a ratio of 0.53 :1
versus 0.7+

jtanguay · « **Reply #9 on:** January 07, 2005, 04:23:19 pm »

ah I was thinking of an automatic tranny... yea what, if any, wiring would the stick tranny have?

QuickTD · « **Reply #10 on:** January 07, 2005, 05:07:48 pm »

The stock 1.9TD tranny has the tallest final drive commonly available in the 020 tranasaxle. The stock fifth gear ratio is .75, there is a .71 fifth gearset that will bolt in without removing the trans from the car. This is what I did. It dropped the cruising rpm by about 150-200rpm @120km/h. I'm happy with the swap. I used new gears because the car was quite young when I did the conversion. The total cost for the gears was about $300CDN. I did the installation myself in less than 2 hours.

The TDI trans poses a couple of problems, nothing major but worth noting. The TDI trans uses a cable shifter instead of the rods that the TD tranny uses. In your case you would need the shifter box and cables from a 97-99 jetta TDI. I'm not sure the passat setup would fit. The TDI tranny uses a hydraulic clutch. You will need the complete clutch master and slave cylinder, hose and the brake master cylinder reservoir from a TDI equipped jetta. The clutch itself is different so you will need the TDI clutch, pressure plate and flywheel. The starter may also be slightly different due to the different clutch so make sure to pick it up as well. The wiring connection on the trans are minimal. There is a switch for the reverse lights and a sender for the speedo and thats about it. You might need to change the connectors so they plug into the TDI parts. Not sure how the speedo calibration would be, I guess just try it and see...

cadmo · « **Reply #11 on:** January 08, 2005, 11:55:38 pm »

The gear sets that you put in, what car and tranny are they from? the price of $ 300 is that from vw? if you could give me a little more info that would be great.

Going to the tdi stick seems like a hassle, the tranny it self is easy but the speed o wiring, clutch and related hard ware kinda turn it into a pain in the butt with the add work and cost.

QuickTD · « **Reply #12 on:** January 09, 2005, 07:56:33 pm »

The gearsets are from early 80's golf/jetta's with FN, FF, FH, FJ and certain 7A transaxle codes. The ratio is 38/27 teeth or ~0.71:1. All were from gas cars, I don't think this ratio was ever used in a diesel.

The part numbers for the gears are:

Mainshaft Gear 020 311 159F
Pinion shaft gear 020 311 361F

The suffix "F" at the end of the part number designates the ratio, make sure to include it if you want the proper gears when ordering. The $300 price is directly from the dealer, no discounts. That was a few years ago, could be more now...

The TDI tranny might be a bit too much gear for the IDI motor anyway. There is such a thing as "overgearing". If you drop the engine RPM out of the optimum range, which usually where the peak torque is developed, (~2400rpm for the 1.9TD) fuel economy can actually get worse.

MacGyver · « **Reply #13 on:** January 11, 2005, 12:52:32 pm »

Unless you have another good source for VW parts @ good price, shoot Brian an email at [email protected] and request pricing on those gear part numbers.
In my experience he's excellent to deal with, his pricing is usually at least 30% less than Altrom, and it's quality, not knockoff crap.
Plus it's delivered to your door without duties since he's in Canada, what's easier than that?

Roseland site:
http://www3.ns.sympatico.ca/roseland/AutoParts.htm

MK3 GTD · « **Reply #14 on:** January 12, 2005, 11:59:15 pm »

Quote from: "QuickTD"

The gearsets are from early 80's golf/jetta's with FN, FF, FH, FJ and certain 7A transaxle codes. The ratio is 38/27 teeth or ~0.71:1. All were from gas cars, I don't think this ratio was ever used in a diesel.

interesting, seems i have a gasser tranny in my Rabbit TD then. Code FN