300TD transmission ratios?
 

Hello All,

I'm trying to find the transmission ratios (auto and manual) for a 300TD with 617 turbo 5 cylinder.
I have searched this forum (and a few others) and only info I found is the auto is 1:1 in fourth. Also would like to know rear axle ratio for car as well. What rpm is engine governed to? (I obviously have no tachometer!)

I plan to use the turbo diesel and possibly trans to repower an old 4X4.

Newbie thanks you for your wisdom! :)

(I reposted topic to this diesel thread--it seemed more appropriate place for it.)

Phil:
I can dig that info up no prob, what year?
Gilly

Phil:
I see now you say you have an 82 300TD. Just so we are on the same page, this is a wagon, a 300TD Turbodiesel. There was also a 300D Turbodiesel, which is a sedan.
On either of these, there was only an automatic available, no manuals, and that's worldwide, not just the US models.
On an 82 (as of Sept 81), the ratios on the wagon are as follows:
1st 4.25:1
2nd 2.41:1
3rd 1.49:1
4th 1.0:1
Reverse 5.67:1
and the rear axle is 3.07:1

On the sedan, the ratios are pretty close, the notable exception being first gear, the ratios on the sedan are:
1st 3.68:1
2nd 2.41:1
3rd 1.44:1
4th 1.0:1
reverse 5.14:1
rear axle 3.07:1, but as of October 1984 changed to 2.88:1
Gilly

Thank you Gilly!

I recently bought the 1982 300TD turbodiesel wagon and I am impressed with the power output from this small 3.0 liter, 5 cylinder diesel.

My 1980 International ScoutII with a Nissan SD33T (factory installed 3.3 liter, 6 cylinder with turbo) has less power than the Mercedes engine. It puts out 101 hp at 3800 rpm, and 175 lb/ft torque at 2200 rpm. To my knowlege, the 617 engine output is 125 hp.

My friend is considering buying a Pinzgauer($) or Unimog($$$), and repowering with the Mercedes 617 engine. Both vehicles (the ones within our price range!) had small four cylinder gas engines with about 82 hp max, and only getting 10 to 12 mpg--pretty sad! The turbo diesel will give a substantial hp and torque increase over the gas engines, plus they are way more fuel efficent!

Thank you for the transmission ratios you gave me. Is it possible to determine which ratio the auto trans has from a visual inspection (a tag or model number perhaps)? I would still like to find out the manual transmission ratios that came behind the 617. It will be MUCH easier to do a repower with the factory trans from the 617 instead of mating it to another one. We are undecided on which trans to use--however, an auto with a 4.25:1 first gear ratio sounds pretty hard to beat!

Thank you again for the info! :)

Phil, got confused for a sec...are you wanting to put the 617 in place of the SD-33T, or are you wanting to repower the 'Mog with a 617? I was under the impression that Mogs were available with the 617 and a 4sp manual, but I'm not sure on that.

BTW, according to a site I found, the 617 puts out 170 ft-lbs of torque and 120 horsepower. Definitely more hp than an SD-33T (I used to have an '80 Scout II {in fact, it was my first diesel}; still miss that ol' rustbucket). :) But, the torque is slightly less...the SD-33T may actually pull better than the 617 (I know mine did). But, although they're used in other applications, I haven't dealt directly with a 617 in any field other than passenger cars, so I can't say for sure.

Just my $.02...keep on truckin' :cool:

Phil:
I know there are transmisssions numbers on the sides of the transmissions, and it should be possible to come up with the ratios based on that, but my material isn't set up that way. So yes it's possible, but not by me, not easily anyways. if you have a specific request for other ratios (MOG 4 spd, etc) let me know. I should be able to come up with examples of 617 powered vehicles that were available with 4 speed manuals if you need to know, probably no answers this weekend though.
Gilly

Step on over to the ML, G-Wagon, Unimog forum. There were some pearls of wisdom there a few months ago about adapting a 617 to a Unimog.

Manual Transmission
 

Philabuster,

While none of the turbo diesels came with manual transmisssions we have installed several in our turbo diesels and since the parts, pedals, etc. are modular, it's a pretty easy switch. It's also a very thrilling switch since the cars really perform with a manual tranny. You no longer have to make a reservation to cross an intersection.

Generally the two main alterations consist of shortening a drive shaft but that cost aboput $125.00 including rebalancing and then you have to shorten the shift linkage ofrom the 240D transmssion by exactly four inches when installing it in a 5 cylinder car. You will need a manual flywheel from either a 123 Series 300D or one from a 115 Series 300d. Both are the same and you should line up the marks on the flywheel and crank for a good balance.

Since the speedos are set up for a particulat rearend ratio, you don't even have to worry about that as long as you don't change rearends.

Ben

Thank you all for the info.

Warden,

I love my Diesel Scout! I have had it almost 3 years now. My other Scout with a 392 V8 was parked within days after buying the diesel. It surely does not have same power, but it gets almost 3 times the mileage--important with daily driver! Also, off roading with a diesel is awesome. No more flooding of carbs and wet distributors. This was my first diesel and it was the reason I picked the Mercedes for a family car.

I am keeping the Scout SD33T motor but making power improvements to it--air filter and 3" exhaust and eliminating the restrictive elbow from the turbo.

My inquiry to engine and trans is for the Pinzgauer my friend is planning to buy--not the Scout. Sorry for the confusion. I didn't see much info on the Mog forum about it--just that it can be done.

Is there any way to keep the auto trans in first gear without it shifting into second? The gear selector only goes to "L" and this is second gear. If trans is used in 4X4, I want to keep it from upshifting while decending a steep hill. The 4.25:1 first gear is great, but if I can't keep it there it won't be much good.

Ridge,

Do you know what ratios the 5 speed manuals are that you are using? I thought my performance in the car with the auto was pretty good. I have not considered going to a manual until you brought it up. I was mainly trying to find trans info for the Pinz conversion (manual and auto).

I took my first road trip with the 300TD to CA last weekend. The car performed better than anticipated! I love driving this thing!:) I was doing 80 to 90 mph most of the trip:eek:.

Gear ratios
 

Philabuster,

Sorry, I don't know the gfear ratios in the 5 speeds but the fifth gear is overdrive. There are some of the SL and SLC gearboxes that are 5 speeds but the 5th gear is not overdrive, therefore they must be closer ratios. They are hard to find and the SLC & SL boxes are very expensive. Too bad you're not closer as you could come by and drive as manual turbo. I'm sure you'd give it some real thought when it's time to repair the automatic! Cheaper and faster.

Ben

Putting the 617a into a MOG, assuming a 404 w/ 6 cylinder gas engine, is no easy or inexpensive task. An adapter plate must be bought to attached the 617a to the Mog bellhousing. The modification is also made difficult by a lack of space in the Mog, the doghouse must be modified. I have not done one of these conversions but certainly there has been lots of discussion. If you are really curious about it go to the topica. mogml list and search the archives there, or ask for someone who owns one and I am sure they will give you the particulars. The 404 tranny is a six speed with 2 reverse speeds, shift on the fly 4X4 and mechanical locking diffs. You cannot separate the t-case and bolt on a 5 speed from something else. Also keep in mind that the Mog has reduction gears in each hub so you have to spin everything pretty darn quick to get any speed.

The Rocky Mountain Moggers site may also lead you to more info. Personnaly, IMHO I recommend buying a 416 instead, far better options and a better match of driveline components etc.... and you get a diesel.

I have not heard of someone doing the same sort of thing to a Pinzie, wonder what they have for bellhousing, tranny and t-case? If it is anything like the Mog's with torque tubes and built in t-case, best of luck!!;) From what I have seen of the Pinzies is that they have even less room around the engine than the 404 Mogs, so be sure to do lots of research and asks lots of questions.

My buddy is pretty set on getting a 6X6 Pinzgauer. The transmission and transfer case are separated by an 18" driveshaft. This is easier to adapt to than a Mog (and cheaper!). The only issues are making room for the engine. An auto trans would further simplify the install.