5th gear options, Audi?

Oh ok. I got ya. I may be getting the 944 na gear from a guy this week. Just waiting to see what condition it's in since the vehicle was in a head on collision.

Acorad,

Where did you get your .68 gear from?

Mike

Mike, from my research: the swappable 0.68 5th gear is in '80-'82 Audi 5000 Diesels w/trans codes: UF, MN, BMO, WV, UW, MO, MR, AAW, AAV, AAY, AAX, AMM, & AMN.

I saw more of these boxes at either All Auto Recycling (719) 683-9600 or Jerry's Foriegn (408) 993-9711, both up in the NW somewhere.

iirc, I found the boxes pretty easily through car-parts.net and then called the guys and had them check the trans codes.

Did you buy a complete box or have them strip out the 5th gear?

Complete box. I thought about having them strip out the gear, but was advised against it by many here. And I'm glad I didn't try to go that route. Stripping out the gear isn't hard, but now that I've done it myself, it really isn't something I'd leave to the junkyard guys. The complete box was about $125 + 50 or so for shipping. Can't wait to get it on the open road!

719 is the area code for Colorado Springs...

Did the quatros have the same gearing and would 5th be different because of the shaft extension coming out the back?

matthewb wrote:Did the quatros have the same gearing and would 5th be different because of the shaft extension coming out the back?

If the Quattro box is an 016 box then it should all fit, google around for the info for the Quattro box.

Where on the Audi transaxles is the code we are looking for and what is the format of the entire code? Is it stamped on the top of the bell housing like the 944's are? I am definitely looking to get a .68 gear for my car. I already have the turbo with the n/a 5th but I run about 2200 at 70 and would like to bump it down a bit. I still have yet to find time to make myself a spreadsheet for this car but I have done it on others so I need to get down to it. I don't suppose anyone has any European contacts that could get he even taller gears??

Well, just to finish this up, the car is back together and the Audi diesel 5th gear gives me 2500 rpm at 70mph, vs the oem turbo 5th that was giving me about 3000 at 70mph.

Which makes me think the Audi gear I got is the same .73 that the 944 NA has. ([edit] Looks like the Audi gear is 0.68 after all, it just didn't drop my revs as much as I thought it would.)

Kind of a disappointment as I expected the Audi gear to be .68 and rpm's at 70mph to be in the 2250 range...

[edit 2/9/2015] So I just discovered that my speedo is reading 8-10 mph low, so I am running about 2250 rpm at 70 mph with the 0.68 Audi 5th gear, which is exactly what I was wanting! Luckily I discovered the speedo error before I got a speeding ticket...

Did you count the teeth?

Well, counting teeth in this pic, looks like 40-44 teeth. Why do you ask?

Because if you count the teeth it will tell you the ratio.

OK, what ratio is 40-44 teeth?

In this configuration it would be 0.909. It looks pretty clear that there is more than a 4 tooth difference between those two gears.

I think I get it now, I need to compare the teeth between the two gears in the pic.

Looks like 38:26 to me, which = 0.68. (could possibly be 39:26 or 40:26, but those aren't ratios of any 016 Audi trans that I've been able to find.)

And the NA 0.73 5th is 37:27, which my gears in the pic clearly are not.

So I guess my Audi diesel 5th in the pic IS 0.68.

Just didn't drop my revs by as much as I thought it would...

[edit 2/9/2015] So I just discovered that my speedo is reading 8-10 mph low, so I am running about 2250 rpm at 70 mph with the 0.68 Audi 5th gear, which is exactly what I was wanting! Luckily I discovered the speedo error before I got a speeding ticket...

Aco, That sounds right. I double checked this morning commute. I have the 951 box with NA 5th and spin exactly 2600 RPM at 70mph. My rear tires are taller 285-35-18

Thanks xschop.

I was killing time at the AC shop today, I got out my 944 Owner's Manual (printed 9/87) and was looking at the Power Train data. My car is a 1988 model.

It lists the 5th gear ratio for the 944, 944S and 944 Turbo as 0.829:1
The Axle ratio is 3.889:1 for the 944 and S, 3.375:1 for the Turbo

Did I waste my time changing the fifth gear in my turbo box for the 5th gear from my old NA box?

Turbo 5th is 0.83, NA is 0.73.

I'm going with the .78 5th gear from the 944 S2.

Rich

fliermike45 wrote:I was killing time at the AC shop today, I got out my 944 Owner's Manual (printed 9/87) and was looking at the Power Train data. My car is a 1988 model.

It lists the 5th gear ratio for the 944, 944S and 944 Turbo as 0.829:1
The Axle ratio is 3.889:1 for the 944 and S, 3.375:1 for the Turbo

Did I waste my time changing the fifth gear in my turbo box for the 5th gear from my old NA box?

My 88 NA had a shorter 5th gear than previous models. Don't know the #s though.

All the Spec 944 guys are salivating over the short 5th's that we have. I mentioned in passing that I was thinking about putting in the NA 5th and I had 3 guys immediately contact me about my .83 fifth.

I'd like to do the swap, but I have other things I need to attend to first...

Here is the page from my Owners Manual.

That's a weird one Mike, according to the Clark's Garage info (http://www.clarks-garage.com/shop-manual/trans-04.htm) the US 944's got the taller 0.73 5th and the US Turbos got the shorter 0.83 5th, but some/all of the ROW 944's got the shorter 0.83. Maybe your manual is for a ROW car or something? Hard to believe out of the 100's of times this swap has been done that no one counted gear teeth and everyone missed that there was zero change in rpms after the swap.